Use-after-free in Linux kernel - CVE-2025-21817

Vulnerability identifier: #VU105135

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-21817

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the queue_attr_store() function in block/blk-sysfs.c. A local user can escalate privileges on the system.

Linux kernel
openEuler
bpftool
kernel
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

Install update from vendor's website.

Linux kernel - addressed in versions 6.13.3, 6.14
bpftool - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
python3-perf-debuginfo - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
python3-perf - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
perf-debuginfo - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
perf - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-tools-devel - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-tools-debuginfo - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-tools - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-source - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-headers - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-devel - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-debugsource - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
kernel-debuginfo - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86
bpftool-debuginfo - addressed in versions 6.6.0-82.0.0.75, 6.6.0-82.0.0.86

• https://git.kernel.org/stable/c/2566ce907e5d5db8a039647208e029ce559baa31
• https://git.kernel.org/stable/c/7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.3
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14

• Use-after-free in Linux kernel block
• openEuler 24.03 LTS update for kernel
• openEuler 24.03 LTS SP1 update for kernel