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Fencer Vulns
high 8.8

CVE-2026-74580 json

vhost: reset the vring metadata cache on vring reconfiguration

published 2026-08-21 2 mo ago modified 2026-10-29 11 d ago also EUVD-2026-64002

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

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

vhost: reset the vring metadata cache on vring reconfiguration

vq->meta_iotlb[] caches the vhost_iotlb_map that backs each vring metadata region, and iotlb_access_ok() returns early on a cache hit, taking the hit as proof that the region has already been validated:

if (vhost_vq_meta_fetch(vq, addr, len, type)) return true;

The cache is reset on VHOST_IOTLB_UPDATE and VHOST_IOTLB_INVALIDATE, on device IOTLB (re)initialisation and on vq reset, but not when VHOST_SET_VRING_ADDR replaces vq->desc, vq->avail and vq->used, nor when VHOST_SET_VRING_NUM changes the region sizes.

With a device IOTLB attached both ioctls are accepted while the vq is live, and neither validates the addresses at ioctl time: vq_access_ok() and vq_log_used_access_ok() return true early because the addresses are GIOVAs, deferring validation to prefetch time. Once the cache has been populated that deferred validation no longer runs -- vq_meta_prefetch() hits the stale entry and returns true -- and vhost_vq_meta_fetch() keeps translating through the old mapping as

map->addr + addr - map->start

for an address the mapping no longer covers. vhost_copy_to_user() and vhost_copy_from_user() consume the result with __copy_to_user() and __copy_from_user(), which do not check it either, so a subsequent used ring update or descriptor fetch accesses memory outside the region the IOTLB actually maps.

Reset the metadata cache whenever the vring is reconfigured, so the new addresses are pushed back through iotlb_access_ok()'s slow path.

Patch / fix

  • Linux Linux 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9, 7.2
  • linux Debian 12 6.1.187-1
  • linux Debian 13 6.12.105-1
  • linux Debian 14 7.1.9-1
  • linux-6.12 Debian 12 6.12.107-1~deb12u1

debian advisories DEBIAN-CVE-2026-74580

  • linux Ubuntu 22.04 LTS 5.15.0-198.208
  • linux Ubuntu 26.04 LTS 7.0.0-42.42
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1117.124
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1016.17
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1118.128
  • linux-gcp Ubuntu 26.04 LTS 7.0.0-1016.18
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1113.119
  • linux-ibm Ubuntu 22.04 LTS 5.15.0-1111.115

ubuntu advisories UBUNTU-CVE-2026-74580

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

  • kernel RHEL 9 5.14.0-687.41.1.el9_8
  • rv RHEL 9 5.14.0-687.41.1.el9_8
  • perf RHEL 9 5.14.0-687.41.1.el9_8
  • rtla RHEL 9 5.14.0-687.41.1.el9_8
  • libperf RHEL 9 5.14.0-687.41.1.el9_8
  • kernel-rt RHEL 9 5.14.0-687.41.1.el9_8
  • kernel-64k RHEL 9 5.14.0-687.41.1.el9_8
  • kernel-core RHEL 9 5.14.0-687.41.1.el9_8

red hat advisories RHSA-2026:81371RHSA-2026:81349RHSA-2026:65710RHSA-2026:62568RHSA-2026:61351RHSA-2026:61256

  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.84.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.84.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
  • kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.84.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
  • kernel-obs-build SLE Module for Development Tools 15 SP7 6.4.0-150700.53.84.1
  • kernel-default-base SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1.150700.17.47.1

suse advisories SUSE-SU-2026:4706-1SUSE-SU-2026:4640-1SUSE-SU-2026:24316-1SUSE-SU-2026:24315-1SUSE-SU-2026:24181-1SUSE-SU-2026:24182-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.39.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.39.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.39.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.39.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.39.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.39.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.39.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.39.1

opensuse advisories openSUSE-SU-2026:22091-1

  • kernel AlmaLinux 10 6.12.0-211.49.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.49.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.49.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.49.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.49.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.49.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.49.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.49.1.el10_2

almalinux advisories ALSA-2026:57251ALSA-2026:57252ALSA-2026:55764ALSA-2026:55765

  • kernel Azure Linux 3.0 6.6.152.1-1

azure linux advisories AZL-96992

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-2026-74580 updated cvss 8.7

kernel: vhost: reset the vring metadata cache on vring reconfiguration

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.138.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.138.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.138.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.138.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.138.1.el9_6
    fixed: vendor fix RHSA-2026:62568
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.41.1.el9_8, perf 5.14.0-687.41.1.el9_8, rtla 5.14.0-687.41.1.el9_8, python3-perf 5.14.0-687.41.1.el9_8, kernel-devel-matched 5.14.0-687.41.1.el9_8, kernel-64k-devel-matched 5.14.0-687.41.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:57252
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.49.1.el10_2, perf 6.12.0-211.49.1.el10_2, rtla 6.12.0-211.49.1.el10_2, python3-perf 6.12.0-211.49.1.el10_2, kernel-devel-matched 6.12.0-211.49.1.el10_2, kernel-64k-devel-matched 6.12.0-211.49.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:57251
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.188.1.el9_2, rtla 5.14.0-284.188.1.el9_2, kernel-devel-matched 5.14.0-284.188.1.el9_2, kernel-64k-devel-matched 5.14.0-284.188.1.el9_2, kernel-debug-devel-matched 5.14.0-284.188.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.188.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:59662
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) rv 5.14.0-427.146.1.el9_4, perf 5.14.0-427.146.1.el9_4, rtla 5.14.0-427.146.1.el9_4, kernel-devel-matched 5.14.0-427.146.1.el9_4, kernel-64k-devel-matched 5.14.0-427.146.1.el9_4, kernel-debug-devel-matched 5.14.0-427.146.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:59544
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.99.1.el10_0, perf 6.12.0-55.99.1.el10_0, rtla 6.12.0-55.99.1.el10_0, python3-perf 6.12.0-55.99.1.el10_0, kernel-devel-matched 6.12.0-55.99.1.el10_0, kernel-64k-devel-matched 6.12.0-55.99.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:61351
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.138.1.el9_6, perf 5.14.0-570.138.1.el9_6, rtla 5.14.0-570.138.1.el9_6, python3-perf 5.14.0-570.138.1.el9_6, kernel-devel-matched 5.14.0-570.138.1.el9_6, kernel-64k-devel-matched 5.14.0-570.138.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:62568
show 32 more
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.156.1.el8_10, kernel 4.18.0-553.156.1.el8_10, bpftool 4.18.0-553.156.1.el8_10, kernel-core 4.18.0-553.156.1.el8_10, kernel-tools 4.18.0-553.156.1.el8_10, python3-perf 4.18.0-553.156.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:55764
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.41.1.el9_8, kernel-64k 5.14.0-687.41.1.el9_8, kernel-core 5.14.0-687.41.1.el9_8, kernel-tools 5.14.0-687.41.1.el9_8, kernel-modules 5.14.0-687.41.1.el9_8, kernel-64k-core 5.14.0-687.41.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:57252
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.49.1.el10_2, kernel-64k 6.12.0-211.49.1.el10_2, kernel-core 6.12.0-211.49.1.el10_2, kernel-tools 6.12.0-211.49.1.el10_2, kernel-modules 6.12.0-211.49.1.el10_2, kernel-64k-core 6.12.0-211.49.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:57251
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.206.1.el8_4, kernel 4.18.0-305.206.1.el8_4, bpftool 4.18.0-305.206.1.el8_4, kernel-core 4.18.0-305.206.1.el8_4, kernel-tools 4.18.0-305.206.1.el8_4, python3-perf 4.18.0-305.206.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:65710
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.208.1.el8_6, kernel 4.18.0-372.208.1.el8_6, bpftool 4.18.0-372.208.1.el8_6, kernel-core 4.18.0-372.208.1.el8_6, kernel-tools 4.18.0-372.208.1.el8_6, python3-perf 4.18.0-372.208.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:59473
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.161.1.el8_8, kernel 4.18.0-477.161.1.el8_8, bpftool 4.18.0-477.161.1.el8_8, kernel-core 4.18.0-477.161.1.el8_8, kernel-tools 4.18.0-477.161.1.el8_8, python3-perf 4.18.0-477.161.1.el8_8, +9 more
    fixed: vendor fix RHSA-2026:61256
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.188.1.el9_2, kernel 5.14.0-284.188.1.el9_2, kernel-64k 5.14.0-284.188.1.el9_2, kernel-core 5.14.0-284.188.1.el9_2, kernel-tools 5.14.0-284.188.1.el9_2, python3-perf 5.14.0-284.188.1.el9_2, +28 more
    fixed: vendor fix RHSA-2026:59662
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool 7.3.0-427.146.1.el9_4, kernel 5.14.0-427.146.1.el9_4, kernel-64k 5.14.0-427.146.1.el9_4, kernel-core 5.14.0-427.146.1.el9_4, kernel-tools 5.14.0-427.146.1.el9_4, python3-perf 5.14.0-427.146.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:59544
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.99.1.el10_0, kernel-64k 6.12.0-55.99.1.el10_0, kernel-core 6.12.0-55.99.1.el10_0, kernel-tools 6.12.0-55.99.1.el10_0, kernel-modules 6.12.0-55.99.1.el10_0, kernel-64k-core 6.12.0-55.99.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:61351
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.138.1.el9_6, kernel-64k 5.14.0-570.138.1.el9_6, kernel-core 5.14.0-570.138.1.el9_6, kernel-tools 5.14.0-570.138.1.el9_6, kernel-modules 5.14.0-570.138.1.el9_6, kernel-64k-core 5.14.0-570.138.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:62568
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.206.1.el8_4, kernel 4.18.0-305.206.1.el8_4, bpftool 4.18.0-305.206.1.el8_4, kernel-core 4.18.0-305.206.1.el8_4, kernel-tools 4.18.0-305.206.1.el8_4, python3-perf 4.18.0-305.206.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:65710
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) perf 4.18.0-372.208.1.el8_6, kernel 4.18.0-372.208.1.el8_6, bpftool 4.18.0-372.208.1.el8_6, kernel-core 4.18.0-372.208.1.el8_6, kernel-tools 4.18.0-372.208.1.el8_6, python3-perf 4.18.0-372.208.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:59473
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.161.1.el8_8, kernel 4.18.0-477.161.1.el8_8, bpftool 4.18.0-477.161.1.el8_8, kernel-core 4.18.0-477.161.1.el8_8, kernel-tools 4.18.0-477.161.1.el8_8, python3-perf 4.18.0-477.161.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:61256
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.41.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.41.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.41.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.41.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.41.1.el9_8
    fixed: vendor fix RHSA-2026:57252
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.49.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.49.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.49.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.49.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.49.1.el10_2
    fixed: vendor fix RHSA-2026:57251
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.99.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.99.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.99.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.99.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.99.1.el10_0
    fixed: vendor fix RHSA-2026:61351
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.156.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.156.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.156.1.el8_10
    fixed: vendor fix RHSA-2026:55764
  • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt 3.10.0-1160.167.1.rt56.1319.el7, kernel-rt-trace 3.10.0-1160.167.1.rt56.1319.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.167.1.rt56.1319.el7
    fixed: vendor fix RHSA-2026:81371
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-kvm 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-core 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-modules 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-debug-kvm 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-debug-core 4.18.0-553.156.1.rt7.497.el8_10, +4 more
    fixed: vendor fix RHSA-2026:55765
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.41.1.el9_8, kernel-rt-64k 5.14.0-687.41.1.el9_8, kernel-rt-core 5.14.0-687.41.1.el9_8, kernel-rt-modules 5.14.0-687.41.1.el9_8, kernel-rt-64k-core 5.14.0-687.41.1.el9_8, kernel-rt-debug-core 5.14.0-687.41.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:57252
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.49.1.el10_2, kernel-rt-64k 6.12.0-211.49.1.el10_2, kernel-rt-core 6.12.0-211.49.1.el10_2, kernel-rt-modules 6.12.0-211.49.1.el10_2, kernel-rt-64k-core 6.12.0-211.49.1.el10_2, kernel-rt-debug-core 6.12.0-211.49.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:57251
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-core 5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-modules 5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-debug-core 5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-modules-core 5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-debug-modules 5.14.0-284.188.1.rt14.473.el9_2, +4 more
    fixed: vendor fix RHSA-2026:59663
  • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt 5.14.0-427.146.1.el9_4, kernel-rt-core 5.14.0-427.146.1.el9_4, kernel-rt-modules 5.14.0-427.146.1.el9_4, kernel-rt-debug-core 5.14.0-427.146.1.el9_4, kernel-rt-modules-core 5.14.0-427.146.1.el9_4, kernel-rt-debug-modules 5.14.0-427.146.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:59544
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.99.1.el10_0, kernel-rt-64k 6.12.0-55.99.1.el10_0, kernel-rt-core 6.12.0-55.99.1.el10_0, kernel-rt-modules 6.12.0-55.99.1.el10_0, kernel-rt-64k-core 6.12.0-55.99.1.el10_0, kernel-rt-debug-core 6.12.0-55.99.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:61351
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.138.1.el9_6, kernel-rt-64k 5.14.0-570.138.1.el9_6, kernel-rt-core 5.14.0-570.138.1.el9_6, kernel-rt-modules 5.14.0-570.138.1.el9_6, kernel-rt-64k-core 5.14.0-570.138.1.el9_6, kernel-rt-debug-core 5.14.0-570.138.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:62568
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.41.1.el9_8, kernel-rt-core 5.14.0-687.41.1.el9_8, kernel-rt-modules 5.14.0-687.41.1.el9_8, kernel-rt-debug-core 5.14.0-687.41.1.el9_8, kernel-rt-modules-core 5.14.0-687.41.1.el9_8, kernel-rt-debug-modules 5.14.0-687.41.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:57252
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.49.1.el10_2, kernel-rt-core 6.12.0-211.49.1.el10_2, kernel-rt-modules 6.12.0-211.49.1.el10_2, kernel-rt-debug-core 6.12.0-211.49.1.el10_2, kernel-rt-modules-core 6.12.0-211.49.1.el10_2, kernel-rt-debug-modules 6.12.0-211.49.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:57251
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-kvm 5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-core 5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-modules 5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-debug-kvm 5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-debug-core 5.14.0-284.188.1.rt14.473.el9_2, +6 more
    fixed: vendor fix RHSA-2026:59663
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt 5.14.0-427.146.1.el9_4, kernel-rt-kvm 5.14.0-427.146.1.el9_4, kernel-rt-core 5.14.0-427.146.1.el9_4, kernel-rt-modules 5.14.0-427.146.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.146.1.el9_4, kernel-rt-debug-core 5.14.0-427.146.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:59544
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.99.1.el10_0, kernel-rt-kvm 6.12.0-55.99.1.el10_0, kernel-rt-core 6.12.0-55.99.1.el10_0, kernel-rt-modules 6.12.0-55.99.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.99.1.el10_0, kernel-rt-debug-core 6.12.0-55.99.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:61351
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.138.1.el9_6, kernel-rt-kvm 5.14.0-570.138.1.el9_6, kernel-rt-core 5.14.0-570.138.1.el9_6, kernel-rt-modules 5.14.0-570.138.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.138.1.el9_6, kernel-rt-debug-core 5.14.0-570.138.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:62568
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-core 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-modules 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-debug-core 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-debug-modules 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-modules-extra 4.18.0-553.156.1.rt7.497.el8_10, +2 more
    fixed: vendor fix RHSA-2026:55765

2 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 SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
12 d ago

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/YounesHfa/CVE-2026-74580 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

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.