Out-of-bounds read in Linux kernel - CVE-2026-52927
Published: June 25, 2026
Vulnerability identifier: #VU135455
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-52927
CWE-ID: CWE-125
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 disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in compat_mtw_from_user in the ebtables netfilter subsystem when converting 32-bit user-supplied extension structures to native kernel structures. A local user can provide a crafted match or target size smaller than the extension requires to disclose sensitive information.
The issue affects extensions that rely on compat_from_user callbacks, which assume they can read the required compat size.
How to mitigate CVE-2026-52927
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/21af4c030567d2e6c89bb927bc18b51fba52a400
- https://git.kernel.org/stable/c/7ad0e463fc7eafae2141cc38054264636f8b3e94
- https://git.kernel.org/stable/c/a27cb7325a6c69970041c7f8541fafed5a1ea3ec
- https://git.kernel.org/stable/c/bf8e8eac7ede51dc318e06acef5a896dcbba7595
- https://git.kernel.org/stable/c/d7a8fb6f10d55a1c37b0bf8c20cca24dffd76e00
- https://git.kernel.org/stable/c/dad9ebf8107955bb54bd3f9cf22591b6ff37bac1
- https://git.kernel.org/stable/c/f438d1786d657d57790c5d138d6db3fc9fdac392
- https://git.kernel.org/stable/c/fcc4c043d137e7f1de4673dba1f3116e45377c67