Out-of-bounds write in Linux kernel - CVE-2026-80863
Published: September 5, 2026
Vulnerability identifier: #VU147058
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-80863
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in free_rd_atomic_resources() in the RXE RDMA driver when modifying a queue pair's max_dest_rd_atomic setting. A local user can modify a queue pair's max_dest_rd_atomic setting to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-80863
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/142c8165b7974b40fa62c393653edb5c00b8b5fe
- https://git.kernel.org/stable/c/30b90b55201902b2b8edcdbe2315ccd4c7547002
- https://git.kernel.org/stable/c/4e5f753e8c280278c09f68fe728abf846e2bdfc1
- https://git.kernel.org/stable/c/9b7d66ea88ae9395e42766b94a5c717b158b940a
- https://git.kernel.org/stable/c/bc6e943794515d2a8417b02597a27bd377468d04
- https://git.kernel.org/stable/c/bdf5deccfbf9f556a08d1d2ef52e9e48f969e53e
- https://git.kernel.org/stable/c/d219e7a8eed3802970c3e4d243d79c70ef0a31bf
- https://git.kernel.org/stable/c/de329533792a373186d79dca1ca120f8fa0afd05
- https://git.kernel.org/stable/c/f5e6580a3a16a83c743ad5a7c16922854a0d8b71