#VU124193 Out-of-bounds read in Linux kernel - CVE-2026-23255
Published: March 20, 2026
Vulnerability identifier: #VU124193
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-23255
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to improper input validation in the /proc/net/ptype component when handling RCU-protected network device references. A local attacker can exploit a race condition during iteration of packet types to cause a denial of service.
The issue arises from missing RCU protection when accessing pt->dev in ptype_seq_show() and ptype_seq_next(), allowing concurrent modifications to trigger an RCU stall.
Remediation
Install security update from vendor's repository.