Improper locking in Linux kernel - CVE-2026-31691
Published: April 27, 2026
Vulnerability identifier: #VU128249
CSH Severity: Low
CVSS v4.0: 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-2026-31691
CWE-ID: CWE-667
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 cause a denial of service.
The vulnerability exists due to improper state management in igb_down() when handling abrupt termination of an AF_XDP zero-copy application. A local user can terminate the application abruptly to cause a denial of service.
The issue can leave the TX queue permanently stalled because NAPI polling continues and igb_down() blocks indefinitely.
How to mitigate CVE-2026-31691
Install security update from vendor's repository.