Integer overflow in Linux kernel - CVE-2026-23343
Published: March 25, 2026
Vulnerability identifier: #VU124501
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-23343
CWE-ID: CWE-190
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 execute arbitrary code or cause a denial of service due to memory corruption.
The vulnerability exists due to improper input validation in the XDP (eXpress Data Path) subsystem when handling packet tailroom calculations. A local user can trigger a negative tailroom value that is interpreted as a large unsigned integer, leading to out-of-bounds memory access during XDP frame processing.
The issue arises when Ethernet drivers report fragment sizes smaller than the actual truesize, causing incorrect tailroom computation in functions such as bpf_xdp_frags_increase_tail().
How to mitigate CVE-2026-23343
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/01379540452a02bbc52f639d45dd365cd3624efb
- https://git.kernel.org/stable/c/8821e857759be9db3cde337ad328b71fe5c8a55f
- https://git.kernel.org/stable/c/94b9da7e9f958cb3d115b21eff824ecd8c3217aa
- https://git.kernel.org/stable/c/98cd8b4d0b836d3edf70161f40efd9cbb8c8f252
- https://git.kernel.org/stable/c/a0fb59f527d03c60b2cd547cfae4a842ad84670f
- https://git.kernel.org/stable/c/c7c790a07697148c41e2d03eb28efe132adda749