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Fencer Vulns
high 7.8

CVE-2026-43248 json

vhost: move vdpa group bound check to vhost_vdpa

published 2026-05-06 6 mo ago modified 2026-10-30 10 d ago also EUVD-2026-27809

cvss
7.8
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 5%
public exploits
0
none known

Summary

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

vhost: move vdpa group bound check to vhost_vdpa

Remove duplication by consolidating these here. This reduces the posibility of a parent driver missing them.

While we're at it, fix a bug in vdpa_sim where a valid ASID can be assigned to a group equal to ngroups, causing an out of bound write.

Patch / fix

  • Linux Linux 6.1.191, 6.6.160, 6.12.75, 6.18.16, 6.19.6, 7.0
  • linux Debian 13 6.12.85-1
  • linux Debian 14 6.19.6-1

debian advisories DEBIAN-CVE-2026-43248

  • linux Ubuntu 24.04 LTS 6.8.0-134.134
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1060.63
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1063.69
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1058.64
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1060.61
  • linux-azure Ubuntu 24.04 LTS 6.8.0-1063.71
  • linux-gkeop Ubuntu 24.04 LTS 6.8.0-1045.48
  • linux-raspi Ubuntu 24.04 LTS 6.8.0-1060.64

ubuntu advisories UBUNTU-CVE-2026-43248

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 10.2 6.12.0-211.55.1.el10_2
  • rv RHEL 10.2 6.12.0-211.55.1.el10_2
  • perf RHEL 10.2 6.12.0-211.55.1.el10_2
  • rtla RHEL 10.2 6.12.0-211.55.1.el10_2
  • libperf RHEL 10.2 6.12.0-211.55.1.el10_2
  • kernel-rt RHEL 10.2 6.12.0-211.55.1.el10_2
  • kernel-64k RHEL 10.2 6.12.0-211.55.1.el10_2
  • kernel-core RHEL 10.2 6.12.0-211.55.1.el10_2

red hat advisories RHSA-2026:67471RHSA-2026:67470

  • kernel-source Linux Micro 6.1, Linux Micro 6.0 6.4.0-50.2
  • kernel-default Linux Micro 6.1, Linux Micro 6.0 6.4.0-50.1
  • kernel-kvmsmall Linux Micro 6.1, Linux Micro 6.0 6.4.0-50.1
  • kernel-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-50.1
  • kernel-source-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-50.2
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.73.2
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.73.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.73.2

suse advisories SUSE-SU-2026:22810-1SUSE-SU-2026:22809-1SUSE-SU-2026:22904-1SUSE-SU-2026:22903-1SUSE-SU-2026:3166-1SUSE-SU-2026:22742-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.36.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.36.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.36.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.36.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.36.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.36.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.36.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.36.1

opensuse advisories openSUSE-SU-2026:21388-1

  • kernel AlmaLinux 9 5.14.0-687.48.1.el9_8
  • rv AlmaLinux 9 5.14.0-687.48.1.el9_8
  • perf AlmaLinux 9 5.14.0-687.48.1.el9_8
  • rtla AlmaLinux 9 5.14.0-687.48.1.el9_8
  • libperf AlmaLinux 9 5.14.0-687.48.1.el9_8
  • kernel-rt AlmaLinux 9 5.14.0-687.48.1.el9_8
  • kernel-64k AlmaLinux 9 5.14.0-687.48.1.el9_8
  • kernel-core AlmaLinux 9 5.14.0-687.48.1.el9_8

almalinux advisories ALSA-2026:67470ALSA-2026:67471

  • kernel Rocky Linux 9 5.14.0-687.48.1.el9_8
  • kernel Rocky Linux 10 6.12.0-211.55.1.el10_2

rocky linux advisories RLSA-2026:67470RLSA-2026:67471

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-2026-43248 updated cvss 7.3

kernel: vhost: move vdpa group bound check to vhost_vdpa

  • 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 “To mitigate this issue, prevent module vdpa from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.”
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.48.1.el9_8, perf 5.14.0-687.48.1.el9_8, rtla 5.14.0-687.48.1.el9_8, python3-perf 5.14.0-687.48.1.el9_8, kernel-devel-matched 5.14.0-687.48.1.el9_8, kernel-64k-devel-matched 5.14.0-687.48.1.el9_8, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module vdpa from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:67470
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.55.1.el10_2, perf 6.12.0-211.55.1.el10_2, rtla 6.12.0-211.55.1.el10_2, python3-perf 6.12.0-211.55.1.el10_2, kernel-devel-matched 6.12.0-211.55.1.el10_2, kernel-64k-devel-matched 6.12.0-211.55.1.el10_2, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module vdpa from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:67471
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.48.1.el9_8, kernel-64k 5.14.0-687.48.1.el9_8, kernel-core 5.14.0-687.48.1.el9_8, kernel-tools 5.14.0-687.48.1.el9_8, kernel-modules 5.14.0-687.48.1.el9_8, kernel-64k-core 5.14.0-687.48.1.el9_8, +27 more
    fixed: vendor fix “To mitigate this issue, prevent module vdpa from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:67470
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.55.1.el10_2, kernel-64k 6.12.0-211.55.1.el10_2, kernel-core 6.12.0-211.55.1.el10_2, kernel-tools 6.12.0-211.55.1.el10_2, kernel-modules 6.12.0-211.55.1.el10_2, kernel-64k-core 6.12.0-211.55.1.el10_2, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module vdpa from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:67471
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.48.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.48.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.48.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.48.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.48.1.el9_8
    fixed: vendor fix “To mitigate this issue, prevent module vdpa from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:67470
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.55.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.55.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.55.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.55.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.55.1.el10_2
    fixed: vendor fix “To mitigate this issue, prevent module vdpa from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:67471
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.48.1.el9_8, kernel-rt-64k 5.14.0-687.48.1.el9_8, kernel-rt-core 5.14.0-687.48.1.el9_8, kernel-rt-modules 5.14.0-687.48.1.el9_8, kernel-rt-64k-core 5.14.0-687.48.1.el9_8, kernel-rt-debug-core 5.14.0-687.48.1.el9_8, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module vdpa from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:67470
show 4 more
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.55.1.el10_2, kernel-rt-64k 6.12.0-211.55.1.el10_2, kernel-rt-core 6.12.0-211.55.1.el10_2, kernel-rt-modules 6.12.0-211.55.1.el10_2, kernel-rt-64k-core 6.12.0-211.55.1.el10_2, kernel-rt-debug-core 6.12.0-211.55.1.el10_2, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module vdpa from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:67471
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.48.1.el9_8, kernel-rt-core 5.14.0-687.48.1.el9_8, kernel-rt-modules 5.14.0-687.48.1.el9_8, kernel-rt-debug-core 5.14.0-687.48.1.el9_8, kernel-rt-modules-core 5.14.0-687.48.1.el9_8, kernel-rt-debug-modules 5.14.0-687.48.1.el9_8, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module vdpa from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:67470
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.55.1.el10_2, kernel-rt-core 6.12.0-211.55.1.el10_2, kernel-rt-modules 6.12.0-211.55.1.el10_2, kernel-rt-debug-core 6.12.0-211.55.1.el10_2, kernel-rt-modules-core 6.12.0-211.55.1.el10_2, kernel-rt-debug-modules 6.12.0-211.55.1.el10_2, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module vdpa from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:67471
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    not affected: vulnerable code not present

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
total
Assessed
24 d ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
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

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.