CVE-2022-49879

System crash via unvalidated ext4 directory entry

Published May 1, 2025 · Updated May 11, 2026

Reachable assertion in the Linux ext4 directory code allows local users to crash the system via a corrupted filesystem image. make_indexed_dir() passes an unchecked directory entry to ext4_rec_len_to_disk(), whose BUG_ON() rejects a rec_len value that is not divisible by four. Triggering the fault requires local access to the corrupted ext4 filesystem and a directory-creation path through make_indexed_dir().

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in the Linux ext4 directory code allows local users to crash the system via a corrupted filesystem image. make_indexed_dir() passes an unchecked directory entry to ext4_rec_len_to_disk(), whose BUG_ON() rejects a rec_len value that is not divisible by four. Triggering the fault requires local access to the corrupted ext4 filesystem and a directory-creation path through make_indexed_dir().

The record

CVE
CVE-2022-49879
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-617, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.30
  2. Affected versionversion=3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 <156451a67b93986fb07c274ef6995ff40766c5ad
  3. Affected versionversion=3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 <17a0bc9bd697f75cfdf9b378d5eb2d7409c91340
  4. Affected versionversion=3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 <2fa24d0274fbf913b56ee31f15bc01168669d909
  5. Affected versionversion=3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 <999cff2b6ce3b45c08abf793bf55534777421327
  6. Affected versionversion=3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 <ce1ee2c8827fb6493e91acbd50f664cf2a972c3d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.30; version=3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 <156451a67b93986fb07c274ef6995ff40766c5ad; version=3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 <17a0bc9bd697f75cfdf9b378d5eb2d7409c91340; version=3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 <2fa24d0274fbf913b56ee31f15bc01168669d909; version=3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 <999cff2b6ce3b45c08abf793bf55534777421327; version=3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 <ce1ee2c8827fb6493e91acbd50f664cf2a972c3d

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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