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Fencer Vulns
high 8.1

CVE-2026-23401 json

KVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE

published 2026-04-01 7 mo ago modified 2026-11-05 3 d ago also EUVD-2026-17828

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

Summary

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

KVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE

When installing an emulated MMIO SPTE, do so *after* dropping/zapping the existing SPTE (if it's shadow-present). While commit a54aa15c6bda3 was right about it being impossible to convert a shadow-present SPTE to an MMIO SPTE due to a _guest_ write, it failed to account for writes to guest memory that are outside the scope of KVM.

E.g. if host userspace modifies a shadowed gPTE to switch from a memslot to emulted MMIO and then the guest hits a relevant page fault, KVM will install the MMIO SPTE without first zapping the shadow-present SPTE.

------------[ cut here ]------------ is_shadow_present_pte(*sptep) WARNING: arch/x86/kvm/mmu/mmu.c:484 at mark_mmio_spte+0xb2/0xc0 [kvm], CPU#0: vmx_ept_stale_r/4292 Modules linked in: kvm_intel kvm irqbypass CPU: 0 UID: 1000 PID: 4292 Comm: vmx_ept_stale_r Not tainted 7.0.0-rc2-eafebd2d2ab0-sink-vm #319 PREEMPT Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:mark_mmio_spte+0xb2/0xc0 [kvm] Call Trace: <TASK> mmu_set_spte+0x237/0x440 [kvm] ept_page_fault+0x535/0x7f0 [kvm] kvm_mmu_do_page_fault+0xee/0x1f0 [kvm] kvm_mmu_page_fault+0x8d/0x620 [kvm] vmx_handle_exit+0x18c/0x5a0 [kvm_intel] kvm_arch_vcpu_ioctl_run+0xc55/0x1c20 [kvm] kvm_vcpu_ioctl+0x2d5/0x980 [kvm] __x64_sys_ioctl+0x8a/0xd0 do_syscall_64+0xb5/0x730 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x47fa3f </TASK> ---[ end trace 0000000000000000 ]---

Patch / fix

  • Linux Linux 5.15.203, 6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11, 7.0
  • Red Hat Red Hat Enterprise Linux 10 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 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 8.6 Advanced Mission Critical Update Support 0:4.18.0-372.191.1.el8_6
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 0:4.18.0-372.191.1.el8_6
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 0:4.18.0-372.191.1.el8_6
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:4.18.0-477.143.1.el8_8
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:4.18.0-477.143.1.el8_8
  • Red Hat Red Hat Enterprise Linux 9 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 0:5.14.0-284.172.1.el9_2, 0:5.14.0-284.172.1.rt14.457.el9_2
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:5.14.0-427.124.1.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:5.14.0-570.112.1.el9_6
  • linux Debian 12 6.1.170-1
  • linux Debian 13 6.12.85-1
  • linux Debian 14 6.19.11-1

debian advisories DEBIAN-CVE-2026-23401

  • linux Ubuntu 22.04 LTS 5.15.0-186.196
  • linux Ubuntu 24.04 LTS 6.8.0-136.136
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1112.119
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1061.64
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1112.122
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1064.72
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1108.114
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1059.67

ubuntu advisories UBUNTU-CVE-2026-23401

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-2026:20593

  • kernel-syms Linux Micro Extras 6.2 6.12.0-160000.33.1
  • kernel-obs-build Linux Micro Extras 6.2 6.12.0-160000.33.1

suse advisories SUSE-SU-2026:21834-1

  • 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-2026:13578

  • 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 8 4.18.0-553.123.1.el8_10.cloud.0.1
  • 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-2026:13577RLSA-2026:13578RLSA-2026:13577

  • kernel Azure Linux 3.0 6.6.134.1-2

azure linux advisories AZL-81354

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2026-23401 updated cvss 8.1

kernel: Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling

  • 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: no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.124.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.124.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.124.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.124.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.124.1.el9_4
    fixed: vendor fix RHSA-2026:13932
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.112.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.112.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.112.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.112.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.112.1.el9_6
    fixed: vendor fix RHSA-2026:14339
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.10.1.el9_8, perf 5.14.0-687.10.1.el9_8, rtla 5.14.0-687.10.1.el9_8, python3-perf 5.14.0-687.10.1.el9_8, kernel-devel-matched 5.14.0-687.10.1.el9_8, kernel-64k-devel-matched 5.14.0-687.10.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:19568
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.16.1.el10_2, perf 6.12.0-211.16.1.el10_2, rtla 6.12.0-211.16.1.el10_2, python3-perf 6.12.0-211.16.1.el10_2, kernel-devel-matched 6.12.0-211.16.1.el10_2, kernel-64k-devel-matched 6.12.0-211.16.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:19569
  • 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 5.14.0-284.172.1.el9_2, rtla 5.14.0-284.172.1.el9_2, kernel-devel-matched 5.14.0-284.172.1.el9_2, kernel-64k-devel-matched 5.14.0-284.172.1.el9_2, kernel-debug-devel-matched 5.14.0-284.172.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.172.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:20593
  • 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 5.14.0-427.124.1.el9_4, perf 5.14.0-427.124.1.el9_4, rtla 5.14.0-427.124.1.el9_4, kernel-devel-matched 5.14.0-427.124.1.el9_4, kernel-64k-devel-matched 5.14.0-427.124.1.el9_4, kernel-debug-devel-matched 5.14.0-427.124.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:13932
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.112.1.el9_6, perf 5.14.0-570.112.1.el9_6, rtla 5.14.0-570.112.1.el9_6, python3-perf 5.14.0-570.112.1.el9_6, kernel-devel-matched 5.14.0-570.112.1.el9_6, kernel-64k-devel-matched 5.14.0-570.112.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:14339
  • 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 5.14.0-687.10.1.el9_8, kernel-64k 5.14.0-687.10.1.el9_8, kernel-core 5.14.0-687.10.1.el9_8, kernel-tools 5.14.0-687.10.1.el9_8, kernel-modules 5.14.0-687.10.1.el9_8, kernel-64k-core 5.14.0-687.10.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:19568
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.16.1.el10_2, kernel-64k 6.12.0-211.16.1.el10_2, kernel-core 6.12.0-211.16.1.el10_2, kernel-tools 6.12.0-211.16.1.el10_2, kernel-modules 6.12.0-211.16.1.el10_2, kernel-64k-core 6.12.0-211.16.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:19569
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.191.1.el8_6, kernel 4.18.0-372.191.1.el8_6, bpftool 4.18.0-372.191.1.el8_6, kernel-core 4.18.0-372.191.1.el8_6, kernel-tools 4.18.0-372.191.1.el8_6, python3-perf 4.18.0-372.191.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.191.1.el8_6, kernel 4.18.0-372.191.1.el8_6, bpftool 4.18.0-372.191.1.el8_6, kernel-core 4.18.0-372.191.1.el8_6, kernel-tools 4.18.0-372.191.1.el8_6, python3-perf 4.18.0-372.191.1.el8_6, +15 more
    fixed: vendor fix RHSA-2026:14230
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.143.1.el8_8, kernel 4.18.0-477.143.1.el8_8, bpftool 4.18.0-477.143.1.el8_8, kernel-core 4.18.0-477.143.1.el8_8, kernel-tools 4.18.0-477.143.1.el8_8, python3-perf 4.18.0-477.143.1.el8_8, +13 more
    fixed: vendor fix RHSA-2026:19521
  • 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 7.0.0-284.172.1.el9_2, kernel 5.14.0-284.172.1.el9_2, kernel-64k 5.14.0-284.172.1.el9_2, kernel-core 5.14.0-284.172.1.el9_2, kernel-tools 5.14.0-284.172.1.el9_2, python3-perf 5.14.0-284.172.1.el9_2, +33 more
    fixed: vendor fix RHSA-2026:20593
  • 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 7.3.0-427.124.1.el9_4, kernel 5.14.0-427.124.1.el9_4, kernel-64k 5.14.0-427.124.1.el9_4, kernel-core 5.14.0-427.124.1.el9_4, kernel-tools 5.14.0-427.124.1.el9_4, python3-perf 5.14.0-427.124.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:13932
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.112.1.el9_6, kernel-64k 5.14.0-570.112.1.el9_6, kernel-core 5.14.0-570.112.1.el9_6, kernel-tools 5.14.0-570.112.1.el9_6, kernel-modules 5.14.0-570.112.1.el9_6, kernel-64k-core 5.14.0-570.112.1.el9_6, +32 more
    fixed: vendor fix RHSA-2026:14339
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.191.1.el8_6, kernel 4.18.0-372.191.1.el8_6, bpftool 4.18.0-372.191.1.el8_6, kernel-core 4.18.0-372.191.1.el8_6, kernel-tools 4.18.0-372.191.1.el8_6, python3-perf 4.18.0-372.191.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:14230
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.143.1.el8_8, kernel 4.18.0-477.143.1.el8_8, bpftool 4.18.0-477.143.1.el8_8, kernel-core 4.18.0-477.143.1.el8_8, kernel-tools 4.18.0-477.143.1.el8_8, python3-perf 4.18.0-477.143.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:19521
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.10.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.10.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.10.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.10.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.10.1.el9_8
    fixed: vendor fix RHSA-2026:19568
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.16.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.16.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.16.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.16.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.16.1.el10_2
    fixed: vendor fix RHSA-2026:19569
  • 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 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 5.14.0-687.10.1.el9_8, kernel-rt-64k 5.14.0-687.10.1.el9_8, kernel-rt-core 5.14.0-687.10.1.el9_8, kernel-rt-modules 5.14.0-687.10.1.el9_8, kernel-rt-64k-core 5.14.0-687.10.1.el9_8, kernel-rt-debug-core 5.14.0-687.10.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:19568
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.16.1.el10_2, kernel-rt-64k 6.12.0-211.16.1.el10_2, kernel-rt-core 6.12.0-211.16.1.el10_2, kernel-rt-modules 6.12.0-211.16.1.el10_2, kernel-rt-64k-core 6.12.0-211.16.1.el10_2, kernel-rt-debug-core 6.12.0-211.16.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:19569
  • 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 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-core 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-modules 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-debug-core 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-modules-core 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-debug-modules 5.14.0-284.172.1.rt14.457.el9_2, +4 more
    fixed: vendor fix RHSA-2026:19875
  • 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 5.14.0-427.124.1.el9_4, kernel-rt-core 5.14.0-427.124.1.el9_4, kernel-rt-modules 5.14.0-427.124.1.el9_4, kernel-rt-debug-core 5.14.0-427.124.1.el9_4, kernel-rt-modules-core 5.14.0-427.124.1.el9_4, kernel-rt-debug-modules 5.14.0-427.124.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:13932
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.112.1.el9_6, kernel-rt-64k 5.14.0-570.112.1.el9_6, kernel-rt-core 5.14.0-570.112.1.el9_6, kernel-rt-modules 5.14.0-570.112.1.el9_6, kernel-rt-64k-core 5.14.0-570.112.1.el9_6, kernel-rt-debug-core 5.14.0-570.112.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:14339
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.10.1.el9_8, kernel-rt-core 5.14.0-687.10.1.el9_8, kernel-rt-modules 5.14.0-687.10.1.el9_8, kernel-rt-debug-core 5.14.0-687.10.1.el9_8, kernel-rt-modules-core 5.14.0-687.10.1.el9_8, kernel-rt-debug-modules 5.14.0-687.10.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:19568
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.16.1.el10_2, kernel-rt-core 6.12.0-211.16.1.el10_2, kernel-rt-modules 6.12.0-211.16.1.el10_2, kernel-rt-debug-core 6.12.0-211.16.1.el10_2, kernel-rt-modules-core 6.12.0-211.16.1.el10_2, kernel-rt-debug-modules 6.12.0-211.16.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:19569
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-kvm 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-core 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-modules 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-debug-kvm 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-debug-core 5.14.0-284.172.1.rt14.457.el9_2, +6 more
    fixed: vendor fix RHSA-2026:19875

4 more fixed, 2 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 SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 d ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.1 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 8.1 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/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 8
  • 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
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7

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.