Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-43299

Vulnerability identifier: #VU130877

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-2026-43299

CWE-ID: CWE-703

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 handling of a read-only filesystem state in btrfs_repair_io_failure() when processing read-repair operations after the filesystem flips to read-only following a critical error. A local user can trigger the error condition to cause a denial of service.

The issue is triggered when a read repair is pending while the filesystem becomes read-only due to a critical error such as ENOSPC in a critical path.

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 6.6.102-6
kernel - update to 6.6.102-6
kernel-debug - update to 6.6.102-6
kernel-debug-devel - update to 6.6.102-6
kernel-devel - update to 6.6.102-6
kernel-headers - update to 6.6.102-6
kernel-tools - update to 6.6.102-6
kernel-tools-libs - update to 6.6.102-6
kernel-tools-libs-devel - update to 6.6.102-6
perf - update to 6.6.102-6
python3-perf - update to 6.6.102-6

• https://git.kernel.org/stable/c/8ceaad6cd6e7fa5f73b0b2796a2e85d75d37e9f3
• https://git.kernel.org/stable/c/f6df18c001e3dcebc08482d0adeacd0cfea08593

• Improper Check or Handling of Exceptional Conditions in Linux kernel btrfs
• Anolis OS update for kernel:6.6