Out-of-bounds read in Linux kernel - CVE-2026-64524
Published: July 27, 2026
Vulnerability identifier: #VU139414
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-64524
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in the Hyper-V DRM protocol resolution response parser when processing a crafted SYNTHVID_RESOLUTION_RESPONSE message. A remote attacker can send a specially crafted resolution response with an oversized resolution_count value to cause a denial of service.
The issue affects the drm/hyperv code path while parsing supported display resolutions from the host.
How to mitigate CVE-2026-64524
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/13d33b9ef67066c77c84273fac5a1d3fde3533d1
- https://git.kernel.org/stable/c/1fb565b77b8f44afabb02de6310065f109d89e94
- https://git.kernel.org/stable/c/8a114b25b5521eae451b13bce98ae978624962e5
- https://git.kernel.org/stable/c/96f7de3172d4aa878b7f87173b2b3507c350fcd6
- https://git.kernel.org/stable/c/9c698b2c43c2667c34f5336bf46ad5786216ac2a
- https://git.kernel.org/stable/c/a321c908f2eeea01539668eb270d074d9b88e490
- https://git.kernel.org/stable/c/bc573752f3dac0d1ab8df7078c1851bc76717653