Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-43299
Published: May 9, 2026
Vulnerability identifier: #VU130877
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-43299
CWE-ID: CWE-703
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-43299
Install security update from vendor's repository.