Out-of-bounds read in Linux kernel - CVE-2026-53223
Published: June 26, 2026
Vulnerability identifier: #VU135533
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-53223
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 the generic timestamp cmsg path in net/socket.c when processing timestamped messages for AF_PACKET sockets. A local user can send or receive crafted packets on an AF_PACKET socket to disclose sensitive information.
Exploitation requires timestamping to be enabled, and information disclosure can occur when SO_RXQ_OVFL is enabled and a non-linear skb is processed.
How to mitigate CVE-2026-53223
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/1ee90b77b727df903033db873c75caac5c27ec98
- https://git.kernel.org/stable/c/24a0d548d3a765cd4558224e4f8e06e14cba26e3
- https://git.kernel.org/stable/c/3dde4fb941fa5649ab809f6cd3e20e0c424a4e31
- https://git.kernel.org/stable/c/71ff5cdd5da61d0438e902aa0fd68c28bc901abe
- https://git.kernel.org/stable/c/ad9a0374ee6d11048e1f74cd5180bad58b9848b4
- https://git.kernel.org/stable/c/b903e9b5629ec8dd6db92174070045bf81ad7060
- https://git.kernel.org/stable/c/e0665b2a8e90bb08bd205062c75662b502d31797
- https://git.kernel.org/stable/c/eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a