Out-of-bounds read in Linux kernel - CVE-2026-64546

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Main Vulnerability Database Vulnerabilities #VU139823

Out-of-bounds read in Linux kernel - CVE-2026-64546

Published: July 28, 2026


Vulnerability identifier: #VU139823
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64546
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to out-of-bounds read in drm_parse_tiled_block() when parsing a crafted DisplayID tiled-display block in EDID data. A local user can supply crafted EDID data with a truncated tiled-display block to disclose sensitive information.

The issue is triggered when the tiled-display block declares a small payload length near the end of a DisplayID extension.


Affected software

Linux kernel
Debian Linux
openEuler
kernel
python3-perf-debuginfo
python3-perf
python2-perf-debuginfo
python2-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-source
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel-tools
kernel-headers
linux (Debian package)

How to mitigate CVE-2026-64546

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
python3-perf-debuginfo - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
python3-perf - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
python2-perf-debuginfo - update to 4.19.90-2608.4.0.0386
python2-perf - update to 4.19.90-2608.4.0.0386
perf-debuginfo - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
perf - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
kernel-tools-devel - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
kernel-tools-debuginfo - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
kernel-source - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
kernel-devel - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
kernel-debugsource - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
kernel-debuginfo - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
bpftool-debuginfo - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
bpftool - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
kernel-tools - addressed in versions 4.19.90-2608.4.0.0386, 5.10.0-330.0.0.231
kernel-headers - update to 5.10.0-330.0.0.231
linux (Debian package) - update to 6.12.100-1

External References

Related Security Bulletins