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Fencer Vulns
high 8.8

CVE-2026-53359 json

KVM: x86: Fix shadow paging use-after-free due to unexpected role

published 2026-07-04 4 mo ago modified 2026-10-03 36 d ago also EUVD-2026-41666

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

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

KVM: x86: Fix shadow paging use-after-free due to unexpected role

Commit 0cb2af2ea66ad ("KVM: x86: Fix shadow paging use-after-free due to unexpected GFN") fixed a shadow paging mismatch between stored and computed GFNs; the bug could be triggered by changing a PDE mapping from outside the guest, and then deleting a memslot. The rmap_remove() call would miss entries created after the PDE change because the GFN of the leaf SPTE does not match the GFN of the struct kvm_mmu_page.

A similar hole however remains if the modified PDE points to a non-leaf page. In this case the gfn can be made to match, but the role does not match: the original large 2MB page creates a kvm_mmu_page with direct=1, while the new 4KB needs a kvm_mmu_page with direct=0. However, kvm_mmu_get_child_sp() does not compare the role, and therefore reuses the page.

The next step is installing a leaf (4KB) SPTE on the new path which records an rmap entry under the gfn resolved by the walk. But when that child is zapped its parent kvm_mmu_page has direct=1 and kvm_mmu_page_get_gfn() computes the gfn for the 4KB page as sp->gfn + index instead of using sp->shadowed_translation[] (or sp->gfns[] in older kernels). It therefore fails to remove the recorded entry.

When the memslot is dropped the shadow page is freed but the rmap entry survives, as in the scenario that was already fixed. Code that later walks that gfn (dirty logging, MMU notifier invalidation, and so on) dereferences an sptep that lies in the freed page, causing the use-after-free.

Patch / fix

  • Linux Linux 5.15.222, 6.1.177, 6.6.144, 6.12.95, 6.18.38, 7.1.3, 7.2
  • linux Debian 12 6.1.177-1
  • linux Debian 13 6.12.95-1
  • linux Debian 14 7.1.3-1

debian advisories DEBIAN-CVE-2026-53359

  • linux Ubuntu 22.04 LTS 5.15.0-187.197
  • linux Ubuntu 24.04 LTS 6.8.0-137.137
  • linux Ubuntu 26.04 LTS 7.0.0-29.29
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1113.120
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1062.65
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1010.10
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1114.124
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1065.73

ubuntu advisories UBUNTU-CVE-2026-53359

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 1-9.el8_10
  • kpatch-patch-4_18_0-553_53_1 RHEL 8 1-14.el8_10
  • kpatch-patch-4_18_0-553_72_1 RHEL 8 1-11.el8_10
  • kpatch-patch-4_18_0-553_109_1 RHEL 8 1-7.el8_10
  • kpatch-patch-4_18_0-553_125_1 RHEL 8 1-4.el8_10
  • kpatch-patch-5_14_0-687_10_1 RHEL 9 1-4.el9_8
  • kpatch-patch-6_12_0-211_16_1 RHEL 10.2 1-4.el10_2
  • kernel RHEL 8 4.18.0-553.143.1.el8_10

red hat advisories RHSA-2026:49033RHSA-2026:44007RHSA-2026:44004RHSA-2026:44006RHSA-2026:44003RHSA-2026:43847

  • kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.37.1
  • kernel-rt Linux Micro 6.2 6.12.0-160000.37.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.37.1
  • kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.37.1
  • kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.37.1.160000.2.19
  • kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.37.1
  • kernel-azure SLES 16.0, SLES for SAP applications 16.0 6.12.0-160000.37.1
  • kernel-obs-qa SLES 16.0, SLES for SAP applications 16.0 6.12.0-160000.37.1

suse advisories SUSE-SU-2026:3809-1SUSE-SU-2026:3594-1SUSE-SU-2026:23237-1SUSE-SU-2026:23068-1SUSE-SU-2026:23221-1SUSE-SU-2026:23231-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.37.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.37.1

opensuse advisories openSUSE-SU-2026:21555-1openSUSE-SU-2026:21388-1openSUSE-SU-2026:11214-1

  • kernel-rt AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel-rt-core AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel-rt-modules AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel-rt-debug-core AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel-rt-debug-modules AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel-rt-modules-extra AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel-rt-debug-modules-extra AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel AlmaLinux 8 4.18.0-553.143.1.el8_10

almalinux advisories ALSA-2026:39082ALSA-2026:39083ALSA-2026:36956ALSA-2026:36957

  • kernel Rocky Linux 9 5.14.0-687.24.1.el9_8
  • kernel Rocky Linux 10 6.12.0-211.32.1.el10_2

rocky linux advisories RLSA-2026:36957RLSA-2026:36956

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-2026-53359 updated cvss 7.8

kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role

  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.127.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.127.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.127.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.127.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.127.1.el9_6
    fixed: vendor fix RHSA-2026:38902
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.24.1.el9_8, perf 5.14.0-687.24.1.el9_8, rtla 5.14.0-687.24.1.el9_8, python3-perf 5.14.0-687.24.1.el9_8, kernel-devel-matched 5.14.0-687.24.1.el9_8, kernel-64k-devel-matched 5.14.0-687.24.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:36957
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.32.1.el10_2, perf 6.12.0-211.32.1.el10_2, rtla 6.12.0-211.32.1.el10_2, python3-perf 6.12.0-211.32.1.el10_2, kernel-devel-matched 6.12.0-211.32.1.el10_2, kernel-64k-devel-matched 6.12.0-211.32.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:36956
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.181.1.el9_2, rtla 5.14.0-284.181.1.el9_2, kernel-devel-matched 5.14.0-284.181.1.el9_2, kernel-64k-devel-matched 5.14.0-284.181.1.el9_2, kernel-debug-devel-matched 5.14.0-284.181.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.181.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:40082
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) rv 5.14.0-427.137.1.el9_4, perf 5.14.0-427.137.1.el9_4, rtla 5.14.0-427.137.1.el9_4, kernel-devel-matched 5.14.0-427.137.1.el9_4, kernel-64k-devel-matched 5.14.0-427.137.1.el9_4, kernel-debug-devel-matched 5.14.0-427.137.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:37729
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.88.1.el10_0, perf 6.12.0-55.88.1.el10_0, rtla 6.12.0-55.88.1.el10_0, python3-perf 6.12.0-55.88.1.el10_0, kernel-devel-matched 6.12.0-55.88.1.el10_0, kernel-64k-devel-matched 6.12.0-55.88.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:39371
show 32 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.127.1.el9_6, perf 5.14.0-570.127.1.el9_6, rtla 5.14.0-570.127.1.el9_6, python3-perf 5.14.0-570.127.1.el9_6, kernel-devel-matched 5.14.0-570.127.1.el9_6, kernel-64k-devel-matched 5.14.0-570.127.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:38902
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.143.1.el8_10, kernel 4.18.0-553.143.1.el8_10, bpftool 4.18.0-553.143.1.el8_10, kernel-core 4.18.0-553.143.1.el8_10, kernel-tools 4.18.0-553.143.1.el8_10, python3-perf 4.18.0-553.143.1.el8_10, +20 more
    fixed: vendor fix RHSA-2026:39083
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.24.1.el9_8, kernel-64k 5.14.0-687.24.1.el9_8, kernel-core 5.14.0-687.24.1.el9_8, kernel-tools 5.14.0-687.24.1.el9_8, kernel-modules 5.14.0-687.24.1.el9_8, kernel-64k-core 5.14.0-687.24.1.el9_8, +28 more
    fixed: vendor fix RHSA-2026:36957
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.32.1.el10_2, kernel-64k 6.12.0-211.32.1.el10_2, kernel-core 6.12.0-211.32.1.el10_2, kernel-tools 6.12.0-211.32.1.el10_2, kernel-modules 6.12.0-211.32.1.el10_2, kernel-64k-core 6.12.0-211.32.1.el10_2, +29 more
    fixed: vendor fix RHSA-2026:36956
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.204.1.el8_6, kernel 4.18.0-372.204.1.el8_6, bpftool 4.18.0-372.204.1.el8_6, kernel-core 4.18.0-372.204.1.el8_6, kernel-tools 4.18.0-372.204.1.el8_6, python3-perf 4.18.0-372.204.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:49033
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.154.1.el8_8, kernel 4.18.0-477.154.1.el8_8, bpftool 4.18.0-477.154.1.el8_8, kernel-core 4.18.0-477.154.1.el8_8, kernel-tools 4.18.0-477.154.1.el8_8, python3-perf 4.18.0-477.154.1.el8_8, +14 more
    fixed: vendor fix RHSA-2026:41229
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.181.1.el9_2, kernel 5.14.0-284.181.1.el9_2, kernel-64k 5.14.0-284.181.1.el9_2, kernel-core 5.14.0-284.181.1.el9_2, kernel-tools 5.14.0-284.181.1.el9_2, python3-perf 5.14.0-284.181.1.el9_2, +33 more
    fixed: vendor fix RHSA-2026:40082
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool 7.3.0-427.137.1.el9_4, kernel 5.14.0-427.137.1.el9_4, kernel-64k 5.14.0-427.137.1.el9_4, kernel-core 5.14.0-427.137.1.el9_4, kernel-tools 5.14.0-427.137.1.el9_4, python3-perf 5.14.0-427.137.1.el9_4, +33 more
    fixed: vendor fix RHSA-2026:37729
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.88.1.el10_0, kernel-64k 6.12.0-55.88.1.el10_0, kernel-core 6.12.0-55.88.1.el10_0, kernel-tools 6.12.0-55.88.1.el10_0, kernel-modules 6.12.0-55.88.1.el10_0, kernel-64k-core 6.12.0-55.88.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:39371
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.127.1.el9_6, kernel-64k 5.14.0-570.127.1.el9_6, kernel-core 5.14.0-570.127.1.el9_6, kernel-tools 5.14.0-570.127.1.el9_6, kernel-modules 5.14.0-570.127.1.el9_6, kernel-64k-core 5.14.0-570.127.1.el9_6, +32 more
    fixed: vendor fix RHSA-2026:38902
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) perf 4.18.0-372.204.1.el8_6, kernel 4.18.0-372.204.1.el8_6, bpftool 4.18.0-372.204.1.el8_6, kernel-core 4.18.0-372.204.1.el8_6, kernel-tools 4.18.0-372.204.1.el8_6, python3-perf 4.18.0-372.204.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:49033
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.154.1.el8_8, kernel 4.18.0-477.154.1.el8_8, bpftool 4.18.0-477.154.1.el8_8, kernel-core 4.18.0-477.154.1.el8_8, kernel-tools 4.18.0-477.154.1.el8_8, python3-perf 4.18.0-477.154.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:41229
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.24.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.24.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.24.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.24.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.24.1.el9_8
    fixed: vendor fix RHSA-2026:36957
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.32.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.32.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.32.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.32.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.32.1.el10_2
    fixed: vendor fix RHSA-2026:36956
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.88.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.88.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.88.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.88.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.88.1.el10_0
    fixed: vendor fix RHSA-2026:39371
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.143.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.143.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.143.1.el8_10
    fixed: vendor fix RHSA-2026:39083
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-kvm 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-core 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-modules 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-debug-kvm 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-debug-core 4.18.0-553.143.1.rt7.484.el8_10, +4 more
    fixed: vendor fix RHSA-2026:39082
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.24.1.el9_8, kernel-rt-64k 5.14.0-687.24.1.el9_8, kernel-rt-core 5.14.0-687.24.1.el9_8, kernel-rt-modules 5.14.0-687.24.1.el9_8, kernel-rt-64k-core 5.14.0-687.24.1.el9_8, kernel-rt-debug-core 5.14.0-687.24.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:36957
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.32.1.el10_2, kernel-rt-64k 6.12.0-211.32.1.el10_2, kernel-rt-core 6.12.0-211.32.1.el10_2, kernel-rt-modules 6.12.0-211.32.1.el10_2, kernel-rt-64k-core 6.12.0-211.32.1.el10_2, kernel-rt-debug-core 6.12.0-211.32.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:36956
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.181.1.rt14.466.el9_2, kernel-rt-core 5.14.0-284.181.1.rt14.466.el9_2, kernel-rt-modules 5.14.0-284.181.1.rt14.466.el9_2, kernel-rt-debug-core 5.14.0-284.181.1.rt14.466.el9_2, kernel-rt-modules-core 5.14.0-284.181.1.rt14.466.el9_2, kernel-rt-debug-modules 5.14.0-284.181.1.rt14.466.el9_2, +4 more
    fixed: vendor fix RHSA-2026:39983
  • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt 5.14.0-427.137.1.el9_4, kernel-rt-core 5.14.0-427.137.1.el9_4, kernel-rt-modules 5.14.0-427.137.1.el9_4, kernel-rt-debug-core 5.14.0-427.137.1.el9_4, kernel-rt-modules-core 5.14.0-427.137.1.el9_4, kernel-rt-debug-modules 5.14.0-427.137.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:37729
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.88.1.el10_0, kernel-rt-64k 6.12.0-55.88.1.el10_0, kernel-rt-core 6.12.0-55.88.1.el10_0, kernel-rt-modules 6.12.0-55.88.1.el10_0, kernel-rt-64k-core 6.12.0-55.88.1.el10_0, kernel-rt-debug-core 6.12.0-55.88.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:39371
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.127.1.el9_6, kernel-rt-64k 5.14.0-570.127.1.el9_6, kernel-rt-core 5.14.0-570.127.1.el9_6, kernel-rt-modules 5.14.0-570.127.1.el9_6, kernel-rt-64k-core 5.14.0-570.127.1.el9_6, kernel-rt-debug-core 5.14.0-570.127.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:38902
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.24.1.el9_8, kernel-rt-core 5.14.0-687.24.1.el9_8, kernel-rt-modules 5.14.0-687.24.1.el9_8, kernel-rt-debug-core 5.14.0-687.24.1.el9_8, kernel-rt-modules-core 5.14.0-687.24.1.el9_8, kernel-rt-debug-modules 5.14.0-687.24.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:36957
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.32.1.el10_2, kernel-rt-core 6.12.0-211.32.1.el10_2, kernel-rt-modules 6.12.0-211.32.1.el10_2, kernel-rt-debug-core 6.12.0-211.32.1.el10_2, kernel-rt-modules-core 6.12.0-211.32.1.el10_2, kernel-rt-debug-modules 6.12.0-211.32.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:36956
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.181.1.rt14.466.el9_2, kernel-rt-kvm 5.14.0-284.181.1.rt14.466.el9_2, kernel-rt-core 5.14.0-284.181.1.rt14.466.el9_2, kernel-rt-modules 5.14.0-284.181.1.rt14.466.el9_2, kernel-rt-debug-kvm 5.14.0-284.181.1.rt14.466.el9_2, kernel-rt-debug-core 5.14.0-284.181.1.rt14.466.el9_2, +6 more
    fixed: vendor fix RHSA-2026:39983
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt 5.14.0-427.137.1.el9_4, kernel-rt-kvm 5.14.0-427.137.1.el9_4, kernel-rt-core 5.14.0-427.137.1.el9_4, kernel-rt-modules 5.14.0-427.137.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.137.1.el9_4, kernel-rt-debug-core 5.14.0-427.137.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:37729
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.88.1.el10_0, kernel-rt-kvm 6.12.0-55.88.1.el10_0, kernel-rt-core 6.12.0-55.88.1.el10_0, kernel-rt-modules 6.12.0-55.88.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.88.1.el10_0, kernel-rt-debug-core 6.12.0-55.88.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:39371
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.127.1.el9_6, kernel-rt-kvm 5.14.0-570.127.1.el9_6, kernel-rt-core 5.14.0-570.127.1.el9_6, kernel-rt-modules 5.14.0-570.127.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.127.1.el9_6, kernel-rt-debug-core 5.14.0-570.127.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:38902
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-core 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-modules 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-debug-core 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-debug-modules 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-modules-extra 4.18.0-553.143.1.rt7.484.el8_10, +2 more
    fixed: vendor fix RHSA-2026:39082
  • Red Hat OpenShift Container Platform 4.12 rhcos 412.86.202608080425
    fixed: vendor fix RHSA-2026:54205
  • Red Hat OpenShift Container Platform 4.13 rhcos 413.92.202608111330
    fixed: vendor fix RHSA-2026:54187

6 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
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
4 mo ago

Exploit prediction

1.37% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/V4bel/Januscape/blob/main/assets/write-up.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Linux Linux

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.