Out-of-bounds write in Linux kernel - CVE-2026-46251
Published: June 4, 2026
Vulnerability identifier: #VU133339
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-2026-46251
CWE-ID: CWE-787
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 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.
How to mitigate CVE-2026-46251
Install security update from vendor's repository.
Sources
- 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