Out-of-bounds write in Linux kernel - CVE-2026-80731
Published: September 4, 2026
Vulnerability identifier: #VU146935
CSH Severity: Low
CVSS v4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80731
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause memory corruption.
The vulnerability exists due to an out-of-bounds write in dev_validate_header when validating short link-layer headers after a network device's hard_header_len increases. A local privileged user can trigger zero-padding of a short link-layer header to cause memory corruption.
The affected path is limited to variable-length layer-2 protocols where the header length is at least min_header_len but shorter than hard_header_len.
Affected software
Linux kernel
How to mitigate CVE-2026-80731
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/3b9a324e646d3657a8d9806dfbfe4f3e4066e882
- https://git.kernel.org/stable/c/53fd7f912c0877647d6a1e1877f5ea8535ee0b4a
- https://git.kernel.org/stable/c/74e035f07f53feca09e2352e77fccb09cad5e208
- https://git.kernel.org/stable/c/8fc9816404166a90ed8d544dc52482fafffb6d9f
- https://git.kernel.org/stable/c/99df6b7a713f96eda206680d100b76e15f9d9b69
- https://git.kernel.org/stable/c/b0f92a5731dc82556a9ae005cc35f71ab136307b
- https://git.kernel.org/stable/c/dbb30dc943a93e083f1e531bfdc6779e57de40d0
- https://git.kernel.org/stable/c/fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6
- https://git.kernel.org/stable/c/fc902f52a02298c7432b2334c0c82a2885a1a8b6