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Review reviewHigh

CVE-2026-63812

Linux

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node() When __destroy_extent_node() sets the inode flag FI_NO_EXTENT, it does not reset the length of the largest extent to 0 and update the inode folio. Since modifications to the extent tree are disallowed afterward, the cached largest extent may become stale. This can trigger the following error in xfstests generic/388: F2FS-fs (dm-0): sanity_check_extent_cache: inode (ino=1761) extent info [220057, 57, 6] is incorrect, run fsck to fix In the f2fs_drop_inode p...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.19
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node() When __destroy_extent_node() sets the inode flag FI_NO_EXTENT, it does not reset the length of the largest extent to 0 and update the inode folio. Since modifications to the extent tree are disallowed afterward, the cached largest extent may become stale. This can trigger the following error in xfstests generic/388: F2FS-fs (dm-0): sanity_check_extent_cache: inode (ino=1761) extent info [220057, 57, 6] is incorrect, run fsck to fix In the f2fs_drop_inode p...

Affected product and versions

Product
Linux
Affected versions
>= 42dd1c91f993431d0b399502479d00e6ad1bca71 < 7e4d8f98be63f98856a5176b9188dada6e7ba9ee, >= ab1eaf9d5c99042f5b0243bf67a06283a4c0757f < 58a5deb220bcac4c73bf58954c0845644c997487, >= b0e4395870eb3441ddc959f6710b5f6ca61aff26 < 20190e498057997532c7f186d081011f18e0a462, >= ed78aeebef05212ef7dca93bd931e4eff67c113f < edf12cbeeeabe799bd2ee21fdb5c336cce6fbad7, >= ed78aeebef05212ef7dca93bd931e4eff67c113f < 1f70ddb28a3c71df124da5fa4040c808116d6bb9, >= 0559a0e962aacbb47519e26ee663be04b72dcb92, >= 6.6.140 < 6.6.144, >= 6.12.88 < 6.12.95, >= 6.18.30 < 6.18.38, >= 7.0.7 < 7.1, >= 7.1
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available