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Fencer Vulns
high 7.0

CVE-2026-64219 json

drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async

published 2026-07-24 3 mo ago modified 2026-10-19 20 d ago also EUVD-2026-48627

cvss
7.0
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:

drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async

[Why&How] dc_process_dmub_aux_transfer_async() copies payload->length bytes into a 16-byte stack buffer (dpaux.data[16]) guarded only by an ASSERT(), which is a no-op in release builds. If a caller ever passes length > 16 this results in a stack buffer overflow via memcpy.

Additionally, link_index is used to dereference dc->links[] without bounds checking against dc->link_count, risking an out-of-bounds access.

Replace the ASSERT with a hard runtime check that returns false when payload->length exceeds the destination buffer size, and add a bounds check for link_index before it is used.

(cherry picked from commit ba4caa9fecdf7a38f98c878ad05a8a64148b6881)

Patch / fix

  • Linux Linux 5.15.209, 6.1.175, 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1
  • linux Debian 12 6.1.176-1
  • linux Debian 13 6.12.94-1
  • linux Debian 14 7.0.12-1

debian advisories DEBIAN-CVE-2026-64219

  • linux Ubuntu 22.04 LTS 5.15.0-186.196
  • linux Ubuntu 24.04 LTS 6.8.0-139.139
  • linux Ubuntu 26.04 LTS 7.0.0-28.28
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1112.119
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1064.67
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1009.9
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1112.122
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1067.75

ubuntu advisories UBUNTU-CVE-2026-64219

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-2026:57252RHSA-2026:57251RHSA-2026:55764RHSA-2026:55765

  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.81.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.81.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1
  • kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.81.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1
  • kernel-obs-build SLE Module for Development Tools 15 SP7 6.4.0-150700.53.81.1
  • kernel-default-base SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1.150700.17.45.1

suse advisories SUSE-SU-2026:4254-1SUSE-SU-2026:23887-1SUSE-SU-2026:23902-1SUSE-SU-2026:23897-1SUSE-SU-2026:23881-1SUSE-SU-2026:4120-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.38.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.38.1

opensuse advisories openSUSE-SU-2026:21910-1

  • 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 Rocky Linux 10 6.12.0-211.49.1.el10_2
  • kernel Rocky Linux 9 5.14.0-687.41.1.el9_8
  • kernel-rt Rocky Linux 8 4.18.0-553.156.1.rt7.497.el8_10
  • kernel Rocky Linux 8 4.18.0-553.156.1.el8_10

rocky linux advisories RLSA-2026:57251RLSA-2026:57252RLSA-2026:55765RLSA-2026:55764

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-2026-64219 updated cvss 7.0

kernel: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async

  • Red Hat Enterprise Linux 7 kernel-rt, kernel-rt-kvm, kernel-rt-trace, kernel-rt-debug-kvm, kernel-rt-trace-kvm 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 Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    under investigation
  • 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 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 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
show 9 more
  • 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 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 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 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 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
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, python-perf, kernel-kdump, kernel-tools, +3 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

0.17% 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 7.0 CVSS:3.1/AV:L/AC:H/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.