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Fencer Vulns
high 7.8

CVE-2026-46215 json

drm: Set old handle to NULL before prime swap in change_handle

published 2026-05-28 5 mo ago modified 2026-08-05 3 mo ago also EUVD-2026-32842

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 13%
public exploits
0
none known

Summary

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

drm: Set old handle to NULL before prime swap in change_handle

There was a potential race condition in change_handle. The ioctl briefly had a single object with two idr entries; a concurrent gem_close could delete the object and remove one of the handles while leaving the other one dangling, which could subsequently be dereferenced for a use-after-free.

To fix this, do the same dance that gem_close itself does. (f6cd7daecff5 drm: Release driver references to handle before making it available again) First idr_replace the old handle to NULL. Later, if the prime operations are successful, actually close it.

create_tail required a similar dance to avoid a similar problem. (bd46cece51a3 drm/gem: Fix race in drm_gem_handle_create_tail()) It idr_allocs the new handle with NULL, then swaps in the correct object later to avoid races. We don't need to do that here, since the only operations that could race are drm_prime, and change_handle holds the prime lock for the entire duration.

v2: cleanups of error paths

Patch / fix

  • Linux Linux 6.18.32, 7.0.9, 7.1
  • linux Debian 14 7.0.9-1

debian advisories DEBIAN-CVE-2026-46215

  • linux Ubuntu 26.04 LTS 7.0.0-28.28
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1009.9
  • linux-gcp Ubuntu 26.04 LTS 7.0.0-1008.8
  • linux-gke Ubuntu 26.04 LTS 7.0.0-1003.4
  • linux-ibm Ubuntu 26.04 LTS 7.0.0-1010.10
  • linux-azure Ubuntu 26.04 LTS 7.0.0-1010.10
  • linux-raspi Ubuntu 26.04 LTS 7.0.0-1015.15
  • linux-riscv Ubuntu 26.04 LTS 7.0.0-28.28.1

ubuntu advisories UBUNTU-CVE-2026-46215

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 5.14.0-687.29.1.el9_8
  • rv RHEL 9 5.14.0-687.29.1.el9_8
  • perf RHEL 9 5.14.0-687.29.1.el9_8
  • rtla RHEL 9 5.14.0-687.29.1.el9_8
  • libperf RHEL 9 5.14.0-687.29.1.el9_8
  • kernel-rt RHEL 9 5.14.0-687.29.1.el9_8
  • kernel-64k RHEL 9 5.14.0-687.29.1.el9_8
  • kernel-core RHEL 9 5.14.0-687.29.1.el9_8

red hat advisories RHSA-2026:43307RHSA-2026:42919

  • kernel-source openSUSE Tumbleweed 7.0.11-1.1

opensuse advisories openSUSE-SU-2026:10954-1

  • kernel AlmaLinux 9 5.14.0-687.29.1.el9_8
  • rv AlmaLinux 9 5.14.0-687.29.1.el9_8
  • perf AlmaLinux 9 5.14.0-687.29.1.el9_8
  • rtla AlmaLinux 9 5.14.0-687.29.1.el9_8
  • libperf AlmaLinux 9 5.14.0-687.29.1.el9_8
  • kernel-rt AlmaLinux 9 5.14.0-687.29.1.el9_8
  • kernel-64k AlmaLinux 9 5.14.0-687.29.1.el9_8
  • kernel-core AlmaLinux 9 5.14.0-687.29.1.el9_8

almalinux advisories ALSA-2026:43307ALSA-2026:42919

  • kernel Rocky Linux 10 6.12.0-211.37.1.el10_2
  • kernel Rocky Linux 9 5.14.0-687.29.1.el9_8

rocky linux advisories RLSA-2026:42919RLSA-2026:43307

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-2026-46215 updated cvss 7.8

kernel: drm: Set old handle to NULL before prime swap in change_handle

  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.29.1.el9_8, perf 5.14.0-687.29.1.el9_8, rtla 5.14.0-687.29.1.el9_8, python3-perf 5.14.0-687.29.1.el9_8, kernel-devel-matched 5.14.0-687.29.1.el9_8, kernel-64k-devel-matched 5.14.0-687.29.1.el9_8, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module drm 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-2026:43307
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.37.1.el10_2, perf 6.12.0-211.37.1.el10_2, rtla 6.12.0-211.37.1.el10_2, python3-perf 6.12.0-211.37.1.el10_2, kernel-devel-matched 6.12.0-211.37.1.el10_2, kernel-64k-devel-matched 6.12.0-211.37.1.el10_2, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module drm 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-2026:42919
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.29.1.el9_8, kernel-64k 5.14.0-687.29.1.el9_8, kernel-core 5.14.0-687.29.1.el9_8, kernel-tools 5.14.0-687.29.1.el9_8, kernel-modules 5.14.0-687.29.1.el9_8, kernel-64k-core 5.14.0-687.29.1.el9_8, +27 more
    fixed: vendor fix “To mitigate this issue, prevent module drm 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-2026:43307
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.37.1.el10_2, kernel-64k 6.12.0-211.37.1.el10_2, kernel-core 6.12.0-211.37.1.el10_2, kernel-tools 6.12.0-211.37.1.el10_2, kernel-modules 6.12.0-211.37.1.el10_2, kernel-64k-core 6.12.0-211.37.1.el10_2, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module drm 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-2026:42919
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.29.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.29.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.29.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.29.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.29.1.el9_8
    fixed: vendor fix “To mitigate this issue, prevent module drm 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-2026:43307
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.37.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.37.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.37.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.37.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.37.1.el10_2
    fixed: vendor fix “To mitigate this issue, prevent module drm 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-2026:42919
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.29.1.el9_8, kernel-rt-64k 5.14.0-687.29.1.el9_8, kernel-rt-core 5.14.0-687.29.1.el9_8, kernel-rt-modules 5.14.0-687.29.1.el9_8, kernel-rt-64k-core 5.14.0-687.29.1.el9_8, kernel-rt-debug-core 5.14.0-687.29.1.el9_8, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module drm 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-2026:43307
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.37.1.el10_2, kernel-rt-64k 6.12.0-211.37.1.el10_2, kernel-rt-core 6.12.0-211.37.1.el10_2, kernel-rt-modules 6.12.0-211.37.1.el10_2, kernel-rt-64k-core 6.12.0-211.37.1.el10_2, kernel-rt-debug-core 6.12.0-211.37.1.el10_2, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module drm 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-2026:42919
show 3 more
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.29.1.el9_8, kernel-rt-core 5.14.0-687.29.1.el9_8, kernel-rt-modules 5.14.0-687.29.1.el9_8, kernel-rt-debug-core 5.14.0-687.29.1.el9_8, kernel-rt-modules-core 5.14.0-687.29.1.el9_8, kernel-rt-debug-modules 5.14.0-687.29.1.el9_8, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module drm 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-2026:43307
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.37.1.el10_2, kernel-rt-core 6.12.0-211.37.1.el10_2, kernel-rt-modules 6.12.0-211.37.1.el10_2, kernel-rt-debug-core 6.12.0-211.37.1.el10_2, kernel-rt-modules-core 6.12.0-211.37.1.el10_2, kernel-rt-debug-modules 6.12.0-211.37.1.el10_2, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module drm 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-2026:42919
  • 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 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
    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
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
4 mo ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/0xCyberstan/CVE-2026-46215-POC referenced PoC, tagged "exploit" by a source, unverified

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.