Improper locking in Linux kernel - CVE-2026-43216
Published: May 7, 2026
Vulnerability identifier: #VU130514
CSH Severity: 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-2026-43216
CWE-ID: CWE-667
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 user to cause a denial of service.
The vulnerability exists due to improper locking in skb_may_tx_timestamp() when processing transmit timestamps in interrupt context. A local user can trigger transmit timestamp handling to cause a deadlock.
The issue occurs when a driver completes the transmit timestamp from a dedicated interrupt handler while the same lock is already write-locked on the same CPU.
Remediation
Install security update from vendor's repository.