Improper locking in Linux kernel - CVE-2026-43216

Vulnerability identifier: #VU130514

CSH Severity: Low

CVSS v4: 6.8 [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]

CVE-ID: CVE-2026-43216

CWE-ID: CWE-667

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Linux kernel
Debian Linux
openEuler
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
kernel-extra-modules
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
python3-perf-debuginfo - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
python3-perf - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
perf-debuginfo - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
perf - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-tools-devel - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-tools-debuginfo - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-tools - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-source - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-headers - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-devel - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-debugsource - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-debuginfo - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
bpftool-debuginfo - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
bpftool - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel - addressed in versions 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-extra-modules - update to 6.6.0-145.3.15.146
linux (Debian package) - update to 6.12.95-1

• https://git.kernel.org/stable/c/983512f3a87fd8dc4c94dfa6b596b6e57df5aad7
• https://git.kernel.org/stable/c/e4c6efb3b70ff87f1df99efce2f8893717695718
• https://git.kernel.org/stable/c/f3e4cceafad27c9363c33622732f86722846ec6f

• Improper locking in Linux kernel net
• openEuler 24.03 LTS SP3 update for kernel
• openEuler 24.03 LTS SP1 update for kernel
• Debian update for linux