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Review reviewHigh

CVE-2023-53473

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: ext4: improve error handling from ext4_dirhash() The ext4_dirhash() will *almost* never fail, especially when the hash tree feature was first introduced. However, with the addition of support of encrypted, casefolded file names, that function can most certainly fail today. So make sure the callers of ext4_dirhash() properly check for failures, and reflect the errors back up to their callers.

CVSS
7.8
EPSS
0.15%
5.07% percentile
CISA KEV
Not listed
Published
2025.10.01
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.15%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ext4: improve error handling from ext4_dirhash() The ext4_dirhash() will *almost* never fail, especially when the hash tree feature was first introduced. However, with the addition of support of encrypted, casefolded file names, that function can most certainly fail today. So make sure the callers of ext4_dirhash() properly check for failures, and reflect the errors back up to their callers.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= b886ee3e778ec2ad43e276fd378ab492cf6819b7 < b2531936118deb3f479c4fa1bcd787b74b8faa6a, >= b886ee3e778ec2ad43e276fd378ab492cf6819b7 < f68876aeef96ef8b708ab10b9cb47ce0a5adb424, >= b886ee3e778ec2ad43e276fd378ab492cf6819b7 < 70d579aefa652a06af97e013e3fbbabbe5a43553, >= b886ee3e778ec2ad43e276fd378ab492cf6819b7 < c1fae027da61fe8e7eb99f7244297e81bc0f1e43, >= b886ee3e778ec2ad43e276fd378ab492cf6819b7 < 4b3cb1d108bfc2aebb0d7c8a52261a53cf7f5786, >= 5.2, >= 5.2 < 5.15.112, >= 5.16 < 6.1.29, >= 6.2 < 6.2.16, >= 6.3 < 6.3.3, 6.4
Fixed versions
5.15.112, 6.1.29, 6.2.16, 6.3.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel 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