Out-of-bounds write in Linux kernel - CVE-2026-45878
Published: May 28, 2026
Vulnerability identifier: #VU132611
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-2026-45878
CWE-ID: CWE-787
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 an out-of-bounds write in the debug address watch handling in drm/amdkfd when processing a crafted watch_id value from userspace. A local user can supply a watch_id larger than INT_MAX to trigger memory access outside the watch_points array and cause a denial of service.
The issue is triggered by integer sign conversion of an unsigned watch_id to a signed value, which can also lead to invalid shift operations.
How to mitigate CVE-2026-45878
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/2b36c0c1bcbbe15f6cfa9652084b3124c835a150
- https://git.kernel.org/stable/c/3c38a0f07aa2bfef2b219b1f045534ad93f85afd
- https://git.kernel.org/stable/c/5a19302cab5cec7ae7f1a60c619951e6c17d8742
- https://git.kernel.org/stable/c/971bf8e61e9b4abaacf9b35eaf76ec222758f9d6
- https://git.kernel.org/stable/c/a0d367e13db63a6ed76ee0d0a8c3a58c1fa98488