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Fencer Vulns
critical 9.8

CVE-2026-43038 in the critical feed json

ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach()

published 2026-05-01 6 mo ago modified 2026-10-19 20 d ago also EUVD-2026-26637

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 17%
public exploits
0
none known

Summary

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

ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach()

Sashiko AI-review observed:

In ip6_err_gen_icmpv6_unreach(), the skb is an outer IPv4 ICMP error packet where its cb contains an IPv4 inet_skb_parm. When skb is cloned into skb2 and passed to icmp6_send(), it uses IP6CB(skb2).

IP6CB interprets the IPv4 inet_skb_parm as an inet6_skb_parm. The cipso offset in inet_skb_parm.opt directly overlaps with dsthao in inet6_skb_parm at offset 18.

If an attacker sends a forged ICMPv4 error with a CIPSO IP option, dsthao would be a non-zero offset. Inside icmp6_send(), mip6_addr_swap() is called and uses ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO).

This would scan the inner, attacker-controlled IPv6 packet starting at that offset, potentially returning a fake TLV without checking if the remaining packet length can hold the full 18-byte struct ipv6_destopt_hao.

Could mip6_addr_swap() then perform a 16-byte swap that extends past the end of the packet data into skb_shared_info?

Should the cb array also be cleared in ip6_err_gen_icmpv6_unreach() and ip6ip6_err() to prevent this?

This patch implements the first suggestion.

I am not sure if ip6ip6_err() needs to be changed. A separate patch would be better anyway.

Patch / fix

  • Linux Linux 5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12, 7.0
  • Red Hat Red Hat Enterprise Linux 10 0:6.12.0-211.28.1.el10_2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:6.12.0-55.77.1.el10_0
  • Red Hat Red Hat Enterprise Linux 8 0:4.18.0-553.132.1.el8_10, 0:4.18.0-553.132.1.rt7.473.el8_10
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:4.18.0-305.194.1.el8_4
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:4.18.0-305.194.1.el8_4
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:4.18.0-372.195.1.el8_6
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:4.18.0-372.195.1.el8_6
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:4.18.0-477.145.1.el8_8
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:4.18.0-477.145.1.el8_8
  • Red Hat Red Hat Enterprise Linux 9 0:5.14.0-687.19.1.el9_8
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:5.14.0-284.174.1.el9_2, 0:5.14.0-284.174.1.rt14.459.el9_2
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:5.14.0-427.129.1.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:5.14.0-570.119.1.el9_6
  • linux Debian 12 6.1.170-1
  • linux Debian 13 6.12.85-1
  • linux Debian 14 6.19.12-1

debian advisories DEBIAN-CVE-2026-43038

  • 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-2026-43038

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 1-11.el8_10
  • kpatch-patch-4_18_0-553_53_1 RHEL 8 1-16.el8_10
  • kpatch-patch-4_18_0-553_72_1 RHEL 8 1-13.el8_10
  • kpatch-patch-4_18_0-553_109_1 RHEL 8 1-9.el8_10
  • kpatch-patch-4_18_0-553_125_1 RHEL 8 1-6.el8_10
  • kpatch-patch-5_14_0-687_10_1 RHEL 9 1-6.el9_8
  • kpatch-patch-6_12_0-211_16_1 RHEL 10.2 1-6.el10_2
  • kernel RHEL 9 5.14.0-687.19.1.el9_8

red hat advisories RHSA-2026:55761RHSA-2026:56225RHSA-2026:56224RHSA-2026:55837RHSA-2026:55762RHSA-2026:55763

  • kernel-livepatch-MICRO-6-0-RT_Update_12 Linux Micro 6.1, Linux Micro 6.0 14-1.1
  • kernel-livepatch-MICRO-6-0-RT_Update_13 Linux Micro 6.1, Linux Micro 6.0 10-1.1
  • kernel-livepatch-MICRO-6-0-RT_Update_11 Linux Micro 6.1, Linux Micro 6.0 15-1.1
  • kernel-livepatch-MICRO-6-0-RT_Update_10 Linux Micro 6.1, Linux Micro 6.0 19-1.1
  • kernel-livepatch-SLE16_Update_0 Linux Micro 6.2 16-160000.4.3
  • kernel-livepatch-SLE16_Update_2 Linux Micro 6.2 12-160000.1.1
  • kernel-livepatch-SLE16_Update_1 Linux Micro 6.2 14-160000.1.1
  • kernel-livepatch-SLE16_Update_4 Linux Micro 6.2 10-160000.1.1

suse advisories SUSE-SU-2026:23045-1SUSE-SU-2026:23046-1SUSE-SU-2026:23107-1SUSE-SU-2026:23108-1SUSE-SU-2026:23044-1SUSE-SU-2026:23106-1

  • kernel AlmaLinux 9 5.14.0-687.19.1.el9_8
  • rv AlmaLinux 9 5.14.0-687.19.1.el9_8
  • perf AlmaLinux 9 5.14.0-687.19.1.el9_8
  • rtla AlmaLinux 9 5.14.0-687.19.1.el9_8
  • libperf AlmaLinux 9 5.14.0-687.19.1.el9_8
  • kernel-rt AlmaLinux 9 5.14.0-687.19.1.el9_8
  • kernel-64k AlmaLinux 9 5.14.0-687.19.1.el9_8
  • kernel-core AlmaLinux 9 5.14.0-687.19.1.el9_8

almalinux advisories ALSA-2026:30848ALSA-2026:30129ALSA-2026:25120ALSA-2026:25121

  • kernel Rocky Linux 10 6.12.0-211.28.1.el10_2
  • kernel Rocky Linux 8 4.18.0-553.132.1.el8_10.cloud.0.1
  • kernel-rt Rocky Linux 8 4.18.0-553.132.1.rt7.473.el8_10
  • kernel Rocky Linux 8 4.18.0-553.132.1.el8_10

rocky linux advisories RLSA-2026:30129RXSA-2026:25121RLSA-2026:25120RLSA-2026:25121

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-2026-43038 updated cvss 7.3

kernel: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach()

  • 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.9.6) libperf 5.14.0-570.119.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.119.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.119.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.119.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.119.1.el9_6
    fixed: vendor fix RHSA-2026:23224
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.19.1.el9_8, perf 5.14.0-687.19.1.el9_8, rtla 5.14.0-687.19.1.el9_8, python3-perf 5.14.0-687.19.1.el9_8, kernel-devel-matched 5.14.0-687.19.1.el9_8, kernel-64k-devel-matched 5.14.0-687.19.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:30848
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.28.1.el10_2, perf 6.12.0-211.28.1.el10_2, rtla 6.12.0-211.28.1.el10_2, python3-perf 6.12.0-211.28.1.el10_2, kernel-devel-matched 6.12.0-211.28.1.el10_2, kernel-64k-devel-matched 6.12.0-211.28.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:30129
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.174.1.el9_2, rtla 5.14.0-284.174.1.el9_2, kernel-devel-matched 5.14.0-284.174.1.el9_2, kernel-64k-devel-matched 5.14.0-284.174.1.el9_2, kernel-debug-devel-matched 5.14.0-284.174.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.174.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:22940
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) rv 5.14.0-427.129.1.el9_4, perf 5.14.0-427.129.1.el9_4, rtla 5.14.0-427.129.1.el9_4, kernel-devel-matched 5.14.0-427.129.1.el9_4, kernel-64k-devel-matched 5.14.0-427.129.1.el9_4, kernel-debug-devel-matched 5.14.0-427.129.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:23237
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.77.1.el10_0, perf 6.12.0-55.77.1.el10_0, rtla 6.12.0-55.77.1.el10_0, python3-perf 6.12.0-55.77.1.el10_0, kernel-devel-matched 6.12.0-55.77.1.el10_0, kernel-64k-devel-matched 6.12.0-55.77.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:24343
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.119.1.el9_6, perf 5.14.0-570.119.1.el9_6, rtla 5.14.0-570.119.1.el9_6, python3-perf 5.14.0-570.119.1.el9_6, kernel-devel-matched 5.14.0-570.119.1.el9_6, kernel-64k-devel-matched 5.14.0-570.119.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:23224
show 32 more
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.132.1.el8_10, kernel 4.18.0-553.132.1.el8_10, bpftool 4.18.0-553.132.1.el8_10, kernel-core 4.18.0-553.132.1.el8_10, kernel-tools 4.18.0-553.132.1.el8_10, python3-perf 4.18.0-553.132.1.el8_10, +20 more
    fixed: vendor fix RHSA-2026:25121
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.19.1.el9_8, kernel-64k 5.14.0-687.19.1.el9_8, kernel-core 5.14.0-687.19.1.el9_8, kernel-tools 5.14.0-687.19.1.el9_8, kernel-modules 5.14.0-687.19.1.el9_8, kernel-64k-core 5.14.0-687.19.1.el9_8, +28 more
    fixed: vendor fix RHSA-2026:30848
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.28.1.el10_2, kernel-64k 6.12.0-211.28.1.el10_2, kernel-core 6.12.0-211.28.1.el10_2, kernel-tools 6.12.0-211.28.1.el10_2, kernel-modules 6.12.0-211.28.1.el10_2, kernel-64k-core 6.12.0-211.28.1.el10_2, +29 more
    fixed: vendor fix RHSA-2026:30129
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.194.1.el8_4, kernel 4.18.0-305.194.1.el8_4, bpftool 4.18.0-305.194.1.el8_4, kernel-core 4.18.0-305.194.1.el8_4, kernel-tools 4.18.0-305.194.1.el8_4, python3-perf 4.18.0-305.194.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:26535
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.195.1.el8_6, kernel 4.18.0-372.195.1.el8_6, bpftool 4.18.0-372.195.1.el8_6, kernel-core 4.18.0-372.195.1.el8_6, kernel-tools 4.18.0-372.195.1.el8_6, python3-perf 4.18.0-372.195.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:25533
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.145.1.el8_8, kernel 4.18.0-477.145.1.el8_8, bpftool 4.18.0-477.145.1.el8_8, kernel-core 4.18.0-477.145.1.el8_8, kernel-tools 4.18.0-477.145.1.el8_8, python3-perf 4.18.0-477.145.1.el8_8, +14 more
    fixed: vendor fix RHSA-2026:22964
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.174.1.el9_2, kernel 5.14.0-284.174.1.el9_2, kernel-64k 5.14.0-284.174.1.el9_2, kernel-core 5.14.0-284.174.1.el9_2, kernel-tools 5.14.0-284.174.1.el9_2, python3-perf 5.14.0-284.174.1.el9_2, +33 more
    fixed: vendor fix RHSA-2026:22940
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool 7.3.0-427.129.1.el9_4, kernel 5.14.0-427.129.1.el9_4, kernel-64k 5.14.0-427.129.1.el9_4, kernel-core 5.14.0-427.129.1.el9_4, kernel-tools 5.14.0-427.129.1.el9_4, python3-perf 5.14.0-427.129.1.el9_4, +33 more
    fixed: vendor fix RHSA-2026:23237
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.77.1.el10_0, kernel-64k 6.12.0-55.77.1.el10_0, kernel-core 6.12.0-55.77.1.el10_0, kernel-tools 6.12.0-55.77.1.el10_0, kernel-modules 6.12.0-55.77.1.el10_0, kernel-64k-core 6.12.0-55.77.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:24343
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.119.1.el9_6, kernel-64k 5.14.0-570.119.1.el9_6, kernel-core 5.14.0-570.119.1.el9_6, kernel-tools 5.14.0-570.119.1.el9_6, kernel-modules 5.14.0-570.119.1.el9_6, kernel-64k-core 5.14.0-570.119.1.el9_6, +32 more
    fixed: vendor fix RHSA-2026:23224
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.194.1.el8_4, kernel 4.18.0-305.194.1.el8_4, bpftool 4.18.0-305.194.1.el8_4, kernel-core 4.18.0-305.194.1.el8_4, kernel-tools 4.18.0-305.194.1.el8_4, python3-perf 4.18.0-305.194.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:26535
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) perf 4.18.0-372.195.1.el8_6, kernel 4.18.0-372.195.1.el8_6, bpftool 4.18.0-372.195.1.el8_6, kernel-core 4.18.0-372.195.1.el8_6, kernel-tools 4.18.0-372.195.1.el8_6, python3-perf 4.18.0-372.195.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:25533
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.145.1.el8_8, kernel 4.18.0-477.145.1.el8_8, bpftool 4.18.0-477.145.1.el8_8, kernel-core 4.18.0-477.145.1.el8_8, kernel-tools 4.18.0-477.145.1.el8_8, python3-perf 4.18.0-477.145.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:22964
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.19.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.19.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.19.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.19.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.19.1.el9_8
    fixed: vendor fix RHSA-2026:30848
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.28.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.28.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.28.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.28.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.28.1.el10_2
    fixed: vendor fix RHSA-2026:30129
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.77.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.77.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.77.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.77.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.77.1.el10_0
    fixed: vendor fix RHSA-2026:24343
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.132.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.132.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.132.1.el8_10
    fixed: vendor fix RHSA-2026:25121
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-kvm 4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-core 4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-modules 4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-debug-kvm 4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-debug-core 4.18.0-553.132.1.rt7.473.el8_10, +4 more
    fixed: vendor fix RHSA-2026:25120
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.19.1.el9_8, kernel-rt-64k 5.14.0-687.19.1.el9_8, kernel-rt-core 5.14.0-687.19.1.el9_8, kernel-rt-modules 5.14.0-687.19.1.el9_8, kernel-rt-64k-core 5.14.0-687.19.1.el9_8, kernel-rt-debug-core 5.14.0-687.19.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:30848
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.28.1.el10_2, kernel-rt-64k 6.12.0-211.28.1.el10_2, kernel-rt-core 6.12.0-211.28.1.el10_2, kernel-rt-modules 6.12.0-211.28.1.el10_2, kernel-rt-64k-core 6.12.0-211.28.1.el10_2, kernel-rt-debug-core 6.12.0-211.28.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:30129
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-core 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-modules 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-debug-core 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-modules-core 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-debug-modules 5.14.0-284.174.1.rt14.459.el9_2, +4 more
    fixed: vendor fix RHSA-2026:22900
  • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt 5.14.0-427.129.1.el9_4, kernel-rt-core 5.14.0-427.129.1.el9_4, kernel-rt-modules 5.14.0-427.129.1.el9_4, kernel-rt-debug-core 5.14.0-427.129.1.el9_4, kernel-rt-modules-core 5.14.0-427.129.1.el9_4, kernel-rt-debug-modules 5.14.0-427.129.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:23237
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.77.1.el10_0, kernel-rt-64k 6.12.0-55.77.1.el10_0, kernel-rt-core 6.12.0-55.77.1.el10_0, kernel-rt-modules 6.12.0-55.77.1.el10_0, kernel-rt-64k-core 6.12.0-55.77.1.el10_0, kernel-rt-debug-core 6.12.0-55.77.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:24343
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.119.1.el9_6, kernel-rt-64k 5.14.0-570.119.1.el9_6, kernel-rt-core 5.14.0-570.119.1.el9_6, kernel-rt-modules 5.14.0-570.119.1.el9_6, kernel-rt-64k-core 5.14.0-570.119.1.el9_6, kernel-rt-debug-core 5.14.0-570.119.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:23224
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.19.1.el9_8, kernel-rt-core 5.14.0-687.19.1.el9_8, kernel-rt-modules 5.14.0-687.19.1.el9_8, kernel-rt-debug-core 5.14.0-687.19.1.el9_8, kernel-rt-modules-core 5.14.0-687.19.1.el9_8, kernel-rt-debug-modules 5.14.0-687.19.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:30848
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.28.1.el10_2, kernel-rt-core 6.12.0-211.28.1.el10_2, kernel-rt-modules 6.12.0-211.28.1.el10_2, kernel-rt-debug-core 6.12.0-211.28.1.el10_2, kernel-rt-modules-core 6.12.0-211.28.1.el10_2, kernel-rt-debug-modules 6.12.0-211.28.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:30129
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-kvm 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-core 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-modules 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-debug-kvm 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-debug-core 5.14.0-284.174.1.rt14.459.el9_2, +6 more
    fixed: vendor fix RHSA-2026:22900
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt 5.14.0-427.129.1.el9_4, kernel-rt-kvm 5.14.0-427.129.1.el9_4, kernel-rt-core 5.14.0-427.129.1.el9_4, kernel-rt-modules 5.14.0-427.129.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.129.1.el9_4, kernel-rt-debug-core 5.14.0-427.129.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:23237
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.77.1.el10_0, kernel-rt-kvm 6.12.0-55.77.1.el10_0, kernel-rt-core 6.12.0-55.77.1.el10_0, kernel-rt-modules 6.12.0-55.77.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.77.1.el10_0, kernel-rt-debug-core 6.12.0-55.77.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:24343
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.119.1.el9_6, kernel-rt-kvm 5.14.0-570.119.1.el9_6, kernel-rt-core 5.14.0-570.119.1.el9_6, kernel-rt-modules 5.14.0-570.119.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.119.1.el9_6, kernel-rt-debug-core 5.14.0-570.119.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:23224
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-core 4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-modules 4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-debug-core 4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-debug-modules 4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-modules-extra 4.18.0-553.132.1.rt7.473.el8_10, +2 more
    fixed: vendor fix RHSA-2026:25120
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    not affected: vulnerable code not present

1 more not affected 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
24 d ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 17% 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 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
CNA 3.1 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/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 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 Extended Update Support Long-Life Add-On
  • 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 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • 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
  • CWE-843 Access of Resource Using Incompatible Type
  • CWE-787 Out-of-bounds Write
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.