Use-after-free in Linux kernel - CVE-2026-80864
Published: September 5, 2026
Vulnerability identifier: #VU147059
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80864
CWE-ID: CWE-416
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 use-after-free in the RDMA/rxe responder resource handling when modifying IB_QP_MAX_DEST_RD_ATOMIC while the responder task is active. A local user can race the freeing and reallocation of rd_atomic resources to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-80864
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/0136b528b753c5a56e4d997ef20b86bb6750b8fb
- https://git.kernel.org/stable/c/60dfd47929cd1e7070daa810d40ce538d888410d
- https://git.kernel.org/stable/c/6f7014237405e7f032b5c53a82d9eccf6161c291
- https://git.kernel.org/stable/c/d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844
- https://git.kernel.org/stable/c/ffa4f0be69656be1755090f02db38d49816585c6