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Fencer Vulns
critical 9.8

CVE-2026-31402 in the critical feed json

nfsd: fix heap overflow in NFSv4.0 LOCK replay cache

published 2026-04-03 7 mo ago modified 2026-10-19 20 d ago also EUVD-2026-18786

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

nfsd: fix heap overflow in NFSv4.0 LOCK replay cache

The NFSv4.0 replay cache uses a fixed 112-byte inline buffer (rp_ibuf[NFSD4_REPLAY_ISIZE]) to store encoded operation responses. This size was calculated based on OPEN responses and does not account for LOCK denied responses, which include the conflicting lock owner as a variable-length field up to 1024 bytes (NFS4_OPAQUE_LIMIT).

When a LOCK operation is denied due to a conflict with an existing lock that has a large owner, nfsd4_encode_operation() copies the full encoded response into the undersized replay buffer via read_bytes_from_xdr_buf() with no bounds check. This results in a slab-out-of-bounds write of up to 944 bytes past the end of the buffer, corrupting adjacent heap memory.

This can be triggered remotely by an unauthenticated attacker with two cooperating NFSv4.0 clients: one sets a lock with a large owner string, then the other requests a conflicting lock to provoke the denial.

We could fix this by increasing NFSD4_REPLAY_ISIZE to allow for a full opaque, but that would increase the size of every stateowner, when most lockowners are not that large.

Instead, fix this by checking the encoded response length against NFSD4_REPLAY_ISIZE before copying into the replay buffer. If the response is too large, set rp_buflen to 0 to skip caching the replay payload. The status is still cached, and the client already received the correct response on the original request.

Patch / fix

  • Linux Linux 5.10.253, 5.15.210, 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10, 7.0
  • Red Hat Red Hat Enterprise Linux 10 0:6.12.0-124.55.1.el10_1, 0:6.12.0-211.16.1.el10_2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:6.12.0-55.72.1.el10_0
  • Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION 0:2.6.32-754.60.1.el6
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:3.10.0-1160.149.1.el7, 0:3.10.0-1160.149.1.rt56.1301.el7
  • Red Hat Red Hat Enterprise Linux 8 0:4.18.0-553.123.1.el8_10, 0:4.18.0-553.123.1.rt7.464.el8_10
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:4.18.0-305.190.1.el8_4
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:4.18.0-305.190.1.el8_4
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:4.18.0-372.190.1.el8_6
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 0:4.18.0-372.190.1.el8_6
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 0:4.18.0-372.190.1.el8_6
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:4.18.0-477.139.1.el8_8
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:4.18.0-477.139.1.el8_8
  • Red Hat Red Hat Enterprise Linux 9 0:5.14.0-611.54.1.el9_7, 0:5.14.0-687.10.1.el9_8
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:5.14.0-70.178.1.el9_0, 0:5.14.0-70.178.1.rt21.250.el9_0
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:5.14.0-284.169.1.el9_2, 0:5.14.0-284.169.1.rt14.454.el9_2
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:5.14.0-427.121.1.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:5.14.0-570.110.1.el9_6
  • linux Debian 12 6.1.170-1
  • linux Debian 13 6.12.85-1
  • linux Debian 14 6.19.10-1

debian advisories DEBIAN-CVE-2026-31402

  • linux Ubuntu 22.04 LTS 5.15.0-185.195
  • linux Ubuntu 24.04 LTS 6.8.0-134.134
  • linux Ubuntu 25.10 6.17.0-40.40
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1111.118
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1060.63
  • linux-aws Ubuntu 25.10 6.17.0-1019.19
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1111.121
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1063.69

ubuntu advisories UBUNTU-CVE-2026-31402

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kpatch-patch-4_18_0-553_85_1 RHEL 8 1-8.el8_10
  • kpatch-patch-4_18_0-553_53_1 RHEL 8 1-13.el8_10
  • kpatch-patch-4_18_0-553_72_1 RHEL 8 1-10.el8_10
  • kpatch-patch-4_18_0-553_109_1 RHEL 8 1-6.el8_10
  • kpatch-patch-4_18_0-553_125_1 RHEL 8 1-3.el8_10
  • kernel RHEL 10.2 6.12.0-211.16.1.el10_2
  • rv RHEL 10.2 6.12.0-211.16.1.el10_2
  • perf RHEL 10.2 6.12.0-211.16.1.el10_2

red hat advisories RHSA-2026:36533RHSA-2026:36534RHSA-2026:36531RHSA-2026:36532RHSA-2026:36530RHSA-2026:19569

  • kernel-default SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Live Patching 15 SP6 +1 more 6.4.0-150600.23.112.1
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.55.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.55.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.55.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.55.1
  • kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.55.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.55.1
  • kernel-obs-build SLE Module for Development Tools 15 SP7 6.4.0-150700.53.55.1

suse advisories SUSE-SU-2026:2195-1SUSE-SU-2026:2238-1SUSE-SU-2026:22509-1SUSE-SU-2026:22508-1SUSE-SU-2026:22507-1SUSE-SU-2026:22288-1

  • kernel AlmaLinux 9 5.14.0-687.10.1.el9_8
  • rv AlmaLinux 9 5.14.0-687.10.1.el9_8
  • perf AlmaLinux 9 5.14.0-687.10.1.el9_8
  • rtla AlmaLinux 9 5.14.0-687.10.1.el9_8
  • libperf AlmaLinux 9 5.14.0-687.10.1.el9_8
  • kernel-rt AlmaLinux 9 5.14.0-687.10.1.el9_8
  • kernel-64k AlmaLinux 9 5.14.0-687.10.1.el9_8
  • kernel-core AlmaLinux 9 5.14.0-687.10.1.el9_8

almalinux advisories ALSA-2026:19568ALSA-2026:19569ALSA-2026:13577ALSA-2026:13578ALSA-2026:13565ALSA-2026:13566

  • kernel Rocky Linux 10 6.12.0-211.16.1.el10_2.0.1
  • kernel Rocky Linux 9 5.14.0-687.10.1.el9_8.0.1
  • kernel Rocky Linux 9 5.14.0-611.54.1.el9_7.cloud.1.0
  • kernel Rocky Linux 8 4.18.0-553.123.1.el8_10.cloud.0.1
  • kernel Rocky Linux 10 6.12.0-124.55.1.el10_1
  • kernel Rocky Linux 9 5.14.0-611.54.1.el9_7
  • kernel-rt Rocky Linux 8 4.18.0-553.123.1.rt7.464.el8_10
  • kernel Rocky Linux 8 4.18.0-553.123.1.el8_10

rocky linux advisories RLSA-2026:19569RLSA-2026:19568RXSA-2026:13565RXSA-2026:13577RLSA-2026:13566RLSA-2026:13565

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-31402 updated cvss 7.8

kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.121.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.121.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.121.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.121.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.121.1.el9_4
    fixed: vendor fix RHSA-2026:10108
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.110.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.110.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.110.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.110.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.110.1.el9_6
    fixed: vendor fix RHSA-2026:11313
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.54.1.el9_7, rv 5.14.0-687.10.1.el9_8, perf 5.14.0-611.54.1.el9_7, perf 5.14.0-687.10.1.el9_8, rtla 5.14.0-611.54.1.el9_7, rtla 5.14.0-687.10.1.el9_8, +20 more
    fixed: vendor fix RHSA-2026:13565
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.55.1.el10_1, rv 6.12.0-211.16.1.el10_2, perf 6.12.0-124.55.1.el10_1, perf 6.12.0-211.16.1.el10_2, rtla 6.12.0-124.55.1.el10_1, rtla 6.12.0-211.16.1.el10_2, +20 more
    fixed: vendor fix RHSA-2026:13566
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.178.1.el9_0, kernel-devel-matched 5.14.0-70.178.1.el9_0, kernel-debug-devel-matched 5.14.0-70.178.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.178.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.178.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.178.1.el9_0, +2 more
    fixed: vendor fix RHSA-2026:13936
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.169.1.el9_2, rtla 5.14.0-284.169.1.el9_2, kernel-devel-matched 5.14.0-284.169.1.el9_2, kernel-64k-devel-matched 5.14.0-284.169.1.el9_2, kernel-debug-devel-matched 5.14.0-284.169.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.169.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:13734
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.72.1.el10_0, perf 6.12.0-55.72.1.el10_0, rtla 6.12.0-55.72.1.el10_0, python3-perf 6.12.0-55.72.1.el10_0, kernel-devel-matched 6.12.0-55.72.1.el10_0, kernel-64k-devel-matched 6.12.0-55.72.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:15883
show 31 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.121.1.el9_4, perf 5.14.0-427.121.1.el9_4, rtla 5.14.0-427.121.1.el9_4, kernel-devel-matched 5.14.0-427.121.1.el9_4, kernel-64k-devel-matched 5.14.0-427.121.1.el9_4, kernel-debug-devel-matched 5.14.0-427.121.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:10108
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.110.1.el9_6, perf 5.14.0-570.110.1.el9_6, rtla 5.14.0-570.110.1.el9_6, python3-perf 5.14.0-570.110.1.el9_6, kernel-devel-matched 5.14.0-570.110.1.el9_6, kernel-64k-devel-matched 5.14.0-570.110.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:11313
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.123.1.el8_10, kernel 4.18.0-553.123.1.el8_10, bpftool 4.18.0-553.123.1.el8_10, kernel-core 4.18.0-553.123.1.el8_10, kernel-tools 4.18.0-553.123.1.el8_10, python3-perf 4.18.0-553.123.1.el8_10, +20 more
    fixed: vendor fix RHSA-2026:13577
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.54.1.el9_7, kernel 5.14.0-687.10.1.el9_8, kernel-64k 5.14.0-611.54.1.el9_7, kernel-64k 5.14.0-687.10.1.el9_8, kernel-core 5.14.0-611.54.1.el9_7, kernel-core 5.14.0-687.10.1.el9_8, +60 more
    fixed: vendor fix RHSA-2026:13565
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.55.1.el10_1, kernel 6.12.0-211.16.1.el10_2, kernel-64k 6.12.0-124.55.1.el10_1, kernel-64k 6.12.0-211.16.1.el10_2, kernel-core 6.12.0-124.55.1.el10_1, kernel-core 6.12.0-211.16.1.el10_2, +62 more
    fixed: vendor fix RHSA-2026:13566
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.190.1.el8_4, kernel 4.18.0-305.190.1.el8_4, bpftool 4.18.0-305.190.1.el8_4, kernel-core 4.18.0-305.190.1.el8_4, kernel-tools 4.18.0-305.190.1.el8_4, python3-perf 4.18.0-305.190.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:14165
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.190.1.el8_6, kernel 4.18.0-372.190.1.el8_6, bpftool 4.18.0-372.190.1.el8_6, kernel-core 4.18.0-372.190.1.el8_6, kernel-tools 4.18.0-372.190.1.el8_6, python3-perf 4.18.0-372.190.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.190.1.el8_6, kernel 4.18.0-372.190.1.el8_6, bpftool 4.18.0-372.190.1.el8_6, kernel-core 4.18.0-372.190.1.el8_6, kernel-tools 4.18.0-372.190.1.el8_6, python3-perf 4.18.0-372.190.1.el8_6, +15 more
    fixed: vendor fix RHSA-2026:13664
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.139.1.el8_8, kernel 4.18.0-477.139.1.el8_8, bpftool 4.18.0-477.139.1.el8_8, kernel-core 4.18.0-477.139.1.el8_8, kernel-tools 4.18.0-477.139.1.el8_8, python3-perf 4.18.0-477.139.1.el8_8, +13 more
    fixed: vendor fix RHSA-2026:13681
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.178.1.el9_0, bpftool 5.14.0-70.178.1.el9_0, kernel-core 5.14.0-70.178.1.el9_0, kernel-tools 5.14.0-70.178.1.el9_0, python3-perf 5.14.0-70.178.1.el9_0, kernel-modules 5.14.0-70.178.1.el9_0, +14 more
    fixed: vendor fix RHSA-2026:13936
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.169.1.el9_2, kernel 5.14.0-284.169.1.el9_2, kernel-64k 5.14.0-284.169.1.el9_2, kernel-core 5.14.0-284.169.1.el9_2, kernel-tools 5.14.0-284.169.1.el9_2, python3-perf 5.14.0-284.169.1.el9_2, +33 more
    fixed: vendor fix RHSA-2026:13734
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) kpatch-patch-5_14_0-427_100_1 1-8.el9_4, kpatch-patch-5_14_0-427_113_1 1-6.el9_4, kpatch-patch-5_14_0-427_126_1 1-3.el9_4, kpatch-patch-5_14_0-427_68_2 1-15.el9_4, kpatch-patch-5_14_0-427_84_1 1-10.el9_4
    fixed: vendor fix RHSA-2026:36533
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.72.1.el10_0, kernel-64k 6.12.0-55.72.1.el10_0, kernel-core 6.12.0-55.72.1.el10_0, kernel-tools 6.12.0-55.72.1.el10_0, kernel-modules 6.12.0-55.72.1.el10_0, kernel-64k-core 6.12.0-55.72.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:15883
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.121.1.el9_4, kernel 5.14.0-427.121.1.el9_4, kernel-64k 5.14.0-427.121.1.el9_4, kernel-core 5.14.0-427.121.1.el9_4, kernel-tools 5.14.0-427.121.1.el9_4, python3-perf 5.14.0-427.121.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:10108
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.110.1.el9_6, kernel-64k 5.14.0-570.110.1.el9_6, kernel-core 5.14.0-570.110.1.el9_6, kernel-tools 5.14.0-570.110.1.el9_6, kernel-modules 5.14.0-570.110.1.el9_6, kernel-64k-core 5.14.0-570.110.1.el9_6, +32 more
    fixed: vendor fix RHSA-2026:11313
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.190.1.el8_4, kernel 4.18.0-305.190.1.el8_4, bpftool 4.18.0-305.190.1.el8_4, kernel-core 4.18.0-305.190.1.el8_4, kernel-tools 4.18.0-305.190.1.el8_4, python3-perf 4.18.0-305.190.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:14165
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.190.1.el8_6, kernel 4.18.0-372.190.1.el8_6, bpftool 4.18.0-372.190.1.el8_6, kernel-core 4.18.0-372.190.1.el8_6, kernel-tools 4.18.0-372.190.1.el8_6, python3-perf 4.18.0-372.190.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:13664
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.139.1.el8_8, kernel 4.18.0-477.139.1.el8_8, bpftool 4.18.0-477.139.1.el8_8, kernel-core 4.18.0-477.139.1.el8_8, kernel-tools 4.18.0-477.139.1.el8_8, python3-perf 4.18.0-477.139.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:13681
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.54.1.el9_7, libperf 5.14.0-687.10.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-611.54.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-687.10.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-611.54.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-687.10.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:13565
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.55.1.el10_1, libperf 6.12.0-211.16.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-124.55.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-211.16.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-124.55.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-211.16.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:13566
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.72.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.72.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.72.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.72.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.72.1.el10_0
    fixed: vendor fix RHSA-2026:15883
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.123.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.123.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.123.1.el8_10
    fixed: vendor fix RHSA-2026:13577
  • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt 3.10.0-1160.149.1.rt56.1301.el7, kernel-rt-trace 3.10.0-1160.149.1.rt56.1301.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.149.1.rt56.1301.el7
    fixed: vendor fix RHSA-2026:14869
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.123.1.rt7.464.el8_10, kernel-rt-kvm 4.18.0-553.123.1.rt7.464.el8_10, kernel-rt-core 4.18.0-553.123.1.rt7.464.el8_10, kernel-rt-modules 4.18.0-553.123.1.rt7.464.el8_10, kernel-rt-debug-kvm 4.18.0-553.123.1.rt7.464.el8_10, kernel-rt-debug-core 4.18.0-553.123.1.rt7.464.el8_10, +4 more
    fixed: vendor fix RHSA-2026:13578
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-kvm 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-core 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-modules 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-debug-kvm 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-debug-core 5.14.0-70.178.1.rt21.250.el9_0, +4 more
    fixed: vendor fix RHSA-2026:14137
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.54.1.el9_7, kernel-rt 5.14.0-687.10.1.el9_8, kernel-rt-64k 5.14.0-611.54.1.el9_7, kernel-rt-64k 5.14.0-687.10.1.el9_8, kernel-rt-core 5.14.0-611.54.1.el9_7, kernel-rt-core 5.14.0-687.10.1.el9_8, +34 more
    fixed: vendor fix RHSA-2026:13565
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.55.1.el10_1, kernel-rt 6.12.0-211.16.1.el10_2, kernel-rt-64k 6.12.0-124.55.1.el10_1, kernel-rt-64k 6.12.0-211.16.1.el10_2, kernel-rt-core 6.12.0-124.55.1.el10_1, kernel-rt-core 6.12.0-211.16.1.el10_2, +34 more
    fixed: vendor fix RHSA-2026:13566
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-core 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-modules 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-debug-core 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-debug-modules 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-modules-extra 5.14.0-70.178.1.rt21.250.el9_0, +2 more
    fixed: vendor fix RHSA-2026:14137
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.169.1.rt14.454.el9_2, kernel-rt-core 5.14.0-284.169.1.rt14.454.el9_2, kernel-rt-modules 5.14.0-284.169.1.rt14.454.el9_2, kernel-rt-debug-core 5.14.0-284.169.1.rt14.454.el9_2, kernel-rt-modules-core 5.14.0-284.169.1.rt14.454.el9_2, kernel-rt-debug-modules 5.14.0-284.169.1.rt14.454.el9_2, +4 more
    fixed: vendor fix RHSA-2026:14301
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.72.1.el10_0, kernel-rt-64k 6.12.0-55.72.1.el10_0, kernel-rt-core 6.12.0-55.72.1.el10_0, kernel-rt-modules 6.12.0-55.72.1.el10_0, kernel-rt-64k-core 6.12.0-55.72.1.el10_0, kernel-rt-debug-core 6.12.0-55.72.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:15883
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.121.1.el9_4, kernel-rt-core 5.14.0-427.121.1.el9_4, kernel-rt-modules 5.14.0-427.121.1.el9_4, kernel-rt-debug-core 5.14.0-427.121.1.el9_4, kernel-rt-modules-core 5.14.0-427.121.1.el9_4, kernel-rt-debug-modules 5.14.0-427.121.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:10108
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.110.1.el9_6, kernel-rt-64k 5.14.0-570.110.1.el9_6, kernel-rt-core 5.14.0-570.110.1.el9_6, kernel-rt-modules 5.14.0-570.110.1.el9_6, kernel-rt-64k-core 5.14.0-570.110.1.el9_6, kernel-rt-debug-core 5.14.0-570.110.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:11313

11 more fixed in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-26-295-11 updated cvss 9.8

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.7 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.7
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-26-209-04 updated cvss 9.8

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.6 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.6
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
23 d ago

Exploit prediction

1.22% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.