Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-45934

Vulnerability identifier: #VU132555

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-2026-45934

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 non-consecutive gaps in chunk allocation in btrfs_create_pending_block_groups() when processing DUP chunk allocation. A local user can trigger chunk allocation to cause a denial of service.

The issue can result in a transaction abort with EEXIST due to overlapping chunk maps, and forced chunk allocation is a demonstrated trigger.

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/156cac365e27a82b64ae510c5f463fd81f0265b1
• https://git.kernel.org/stable/c/7d4eadee7042d27fcea659fcdd738f463a7d2e70
• https://git.kernel.org/stable/c/b14c5e04bd0f722ed631845599d52d03fcae1bc1

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