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Review reviewHigh

CVE-2026-63814

Linux

In the Linux kernel, the following vulnerability has been resolved: f2fs: validate ACL entry sizes in f2fs_acl_from_disk() f2fs_acl_count() only validates the aggregate ACL xattr length. A malformed ACL can still place ACL_USER or ACL_GROUP in a slot that only contains struct f2fs_acl_entry_short bytes, and f2fs_acl_from_disk() then reads entry->e_id before verifying that a full entry fits. Require a short entry before reading e_tag and e_perm, and require a full entry before reading e_id for ACL_USER and ACL_GROUP. Return -EFSCORRUPTED from these new truncated-entry checks, while keeping t...

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: validate ACL entry sizes in f2fs_acl_from_disk() f2fs_acl_count() only validates the aggregate ACL xattr length. A malformed ACL can still place ACL_USER or ACL_GROUP in a slot that only contains struct f2fs_acl_entry_short bytes, and f2fs_acl_from_disk() then reads entry->e_id before verifying that a full entry fits. Require a short entry before reading e_tag and e_perm, and require a full entry before reading e_id for ACL_USER and ACL_GROUP. Return -EFSCORRUPTED from these new truncated-entry checks, while keeping t...

Affected product and versions

Product
Linux
Affected versions
>= af48b85b8cd3fbb12c9b6759c16db6d69c0b03da < 733cd8474e6d763d75ed96f3f2b98a25480cf2b9, >= af48b85b8cd3fbb12c9b6759c16db6d69c0b03da < 4e2a96ec7236e248e706850568e0a925fd21b588, >= af48b85b8cd3fbb12c9b6759c16db6d69c0b03da < 442ca20c54038e2400cf28aaa944cf1de2c8e65d, >= af48b85b8cd3fbb12c9b6759c16db6d69c0b03da < 1ddf3fd21c4c652f9cab5552515c04a166662306, >= af48b85b8cd3fbb12c9b6759c16db6d69c0b03da < aba4f94ac1832c7299c33e1b4fe5f87eef6dc8f1, >= af48b85b8cd3fbb12c9b6759c16db6d69c0b03da < ff83de56882cb8466184d322abece2589258ca56, >= af48b85b8cd3fbb12c9b6759c16db6d69c0b03da < 5d8a39649947a4e86c8fbc682d7fc0041b8d109a, >= af48b85b8cd3fbb12c9b6759c16db6d69c0b03da < c4810ada31e80cbe4011467c4f3b1e93f94134f3, >= 3.8
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