Use-after-free in Linux kernel - CVE-2026-53185

Vulnerability identifier: #VU135610

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-2026-53185

CWE-ID: CWE-416

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 use-after-free in zram_bvec_write_partial() when processing partial writes for ZRAM_WB slots. A local user can trigger an asynchronous backing device read and subsequent access to a freed page to cause a denial of service.

The issue occurs because the read operation may still be in flight when the buffer page is freed.

Linux kernel
Anolis OS
bpftool
kernel
kernel-debug
kernel-debug-devel
kernel-devel
kernel-headers
kernel-tools
kernel-tools-libs
kernel-tools-libs-devel
perf
python3-perf

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
bpftool - update to 6.6.102-7
kernel - update to 6.6.102-7
kernel-debug - update to 6.6.102-7
kernel-debug-devel - update to 6.6.102-7
kernel-devel - update to 6.6.102-7
kernel-headers - update to 6.6.102-7
kernel-tools - update to 6.6.102-7
kernel-tools-libs - update to 6.6.102-7
kernel-tools-libs-devel - update to 6.6.102-7
perf - update to 6.6.102-7
python3-perf - update to 6.6.102-7

• https://git.kernel.org/stable/c/0c2821665ff71be3f4b07ecece384669f2877f6a
• https://git.kernel.org/stable/c/198b5a14cca27263b9c14b20114c8092de15dfcb
• https://git.kernel.org/stable/c/732fd9f0b9c1cdc6dfd77162ded60df005182cc0
• https://git.kernel.org/stable/c/77a602b505ce4802915853cfc435a4722fab3e64
• https://git.kernel.org/stable/c/c96786d6ff1acc1d54d9241e97767554c1dfdd5b

• Use-after-free in Linux kernel block zram driver
• Anolis OS update for kernel:6.6