Use-after-free in Linux kernel - CVE-2026-63884
Published: July 20, 2026
Vulnerability identifier: #VU138767
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-63884
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the i915 TTM object purge logic when purging an object during eviction after validating buffer object placement. A local user can trigger the purge path through crafted GPU memory management operations to cause a denial of service.
The issue was reported under heavy use on DG2 systems and occurs because the associated i915 TTM page vector container may be replaced while the object is still busy.
How to mitigate CVE-2026-63884
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/073bcbc95e9648c976da1654c7590a8d6ee12c2d
- https://git.kernel.org/stable/c/28b22dbaf407598cb3bb1d2c586a6f8018690ac2
- https://git.kernel.org/stable/c/5c4063c87a619e4df954c179d24628636f5db15f
- https://git.kernel.org/stable/c/a29654d451bbffe63d584a4cf64ad0efce6bcf1c
- https://git.kernel.org/stable/c/c9ae7e7e3bc98615364313b08d7acea5239ded0b
- https://git.kernel.org/stable/c/df73f3bc731af1c39ac5405bc59c4e7c6f8e9117