SB2026060435 - Out-of-bounds write in Linux kernel btrfs
Published: June 4, 2026
Security Bulletin ID
SB2026060435
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-46251)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 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
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to list corruption in the btrfs transaction handling logic for the block group tree dirty_list when committing a transaction with EXTENT_TREE_V2 enabled. A local user can trigger filesystem operations that dirty a block group to cause a denial of service.
Only systems using btrfs with the EXTENT_TREE_V2 incompat flag set are affected.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/201091da34c4f113af6b4a7407091c39bf29d4ca
- https://git.kernel.org/stable/c/3a1f4264daed4b419c325a7fe35e756cada3cf82
- https://git.kernel.org/stable/c/4eb830847d84276f1c8ea46541cfeeedaba1fb63
- https://git.kernel.org/stable/c/6e10283b5519d987d880d71bec90cdc7f2ec62b3
- https://git.kernel.org/stable/c/80e1fda9c084dcf54819a12bc7682ec0afd2d8f4
- https://git.kernel.org/stable/c/e3d1fd084319f8f0830b22f014c7af6a96b4497b