CVE-2026-46251
Linux kernel Btrfs: block_group_tree list corruption in EXTENT_TREE_V2 path.
Is CVE-2026-46251 being exploited?
Not confirmed. CVE-2026-46251 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.13% probability of exploitation in the next 30 days.
How severe is CVE-2026-46251?
CVE-2026-46251 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-46251?
Yes. A fix has been recorded for CVE-2026-46251. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-46251 affect?
CVE-2026-46251 affects Linux kernel (Btrfs). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-46251?
Apply kernel update with the Btrfs fix; reboot and verify FS integrity.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Btrfs block_group_tree corruption can cause transaction aborts and data integrity issues.
Patch when possible
- affected>= 14033b08a02916e85ffc5397e4ac15337359f3ae and < 6e10283b5519d987d880d71bec90cdc7f2ec62b3
- affected>= 14033b08a02916e85ffc5397e4ac15337359f3ae and < e3d1fd084319f8f0830b22f014c7af6a96b4497b
- affected>= 14033b08a02916e85ffc5397e4ac15337359f3ae and < 4eb830847d84276f1c8ea46541cfeeedaba1fb63
- affected>= 14033b08a02916e85ffc5397e4ac15337359f3ae and < 80e1fda9c084dcf54819a12bc7682ec0afd2d8f4
- affected>= 14033b08a02916e85ffc5397e4ac15337359f3ae and < 201091da34c4f113af6b4a7407091c39bf29d4ca
- affected>= 14033b08a02916e85ffc5397e4ac15337359f3ae and < 3a1f4264daed4b419c325a7fe35e756cada3cf82
- affecteddabf41db56f378a360ff0219c467f8dfecda7dd6
- affected>= 6.0.19 and < 6.1
- affected6.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.