NULL pointer dereference in Linux kernel - CVE-2026-53163

Vulnerability identifier: #VU135627

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-2026-53163

CWE-ID: CWE-476

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 a null pointer dereference in remove_waiter() in the rtmutex futex proxy locking path when handling FUTEX_CMP_REQUEUE_PI operations during deadlock detection or proxy lock acquisition. A local user can invoke crafted futex operations to cause a denial of service.

Linux kernel
Debian Linux
openEuler
kernel-tools
python3-perf-debuginfo
python3-perf
python2-perf-debuginfo
python2-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-source
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-tools - update to 4.19.90-2607.4.0.0382
python3-perf-debuginfo - update to 4.19.90-2607.4.0.0382
python3-perf - update to 4.19.90-2607.4.0.0382
python2-perf-debuginfo - update to 4.19.90-2607.4.0.0382
python2-perf - update to 4.19.90-2607.4.0.0382
perf-debuginfo - update to 4.19.90-2607.4.0.0382
perf - update to 4.19.90-2607.4.0.0382
kernel-tools-devel - update to 4.19.90-2607.4.0.0382
kernel-tools-debuginfo - update to 4.19.90-2607.4.0.0382
kernel-source - update to 4.19.90-2607.4.0.0382
kernel-devel - update to 4.19.90-2607.4.0.0382
kernel-debugsource - update to 4.19.90-2607.4.0.0382
kernel-debuginfo - update to 4.19.90-2607.4.0.0382
bpftool-debuginfo - update to 4.19.90-2607.4.0.0382
bpftool - update to 4.19.90-2607.4.0.0382
kernel - update to 4.19.90-2607.4.0.0382
linux (Debian package) - update to 6.12.95-1

• https://git.kernel.org/stable/c/40a25d59e85b3c8709ac2424d44f65610467871e
• https://git.kernel.org/stable/c/55363fa0a04524d11efeaadee734d2db1756ed27
• https://git.kernel.org/stable/c/a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53

• NULL pointer dereference in Linux kernel locking
• Debian update for linux
• openEuler 20.03 LTS SP4 update for kernel