CVE-2022-49348

Kernel crash via forged fast-commit replay flag

Published Feb 26, 2025 · Updated May 11, 2026

Denial of service in the Linux kernel ext4 driver allows local users with mount privileges to crash the kernel via a corrupted filesystem. The ext4 superblock loader copies the on-disk s_state value into s_mount_state without filtering EXT4_FC_REPLAY, so a forged replay bit bypasses sanity checks and reaches BUG() in ext4_es_cache_extent(). Triggering the fault requires permission to present and mount a malicious ext4 filesystem, and the bounded result is a kernel crash that interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel ext4 driver allows local users with mount privileges to crash the kernel via a corrupted filesystem. The ext4 superblock loader copies the on-disk s_state value into s_mount_state without filtering EXT4_FC_REPLAY, so a forged replay bit bypasses sanity checks and reaches BUG() in ext4_es_cache_extent(). Triggering the fault requires permission to present and mount a malicious ext4 filesystem, and the bounded result is a kernel crash that interrupts the host.

The record

CVE
CVE-2022-49348
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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

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Is a vulnerable build present?

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

  1. Affected versionversion=5.10
  2. Affected versionversion=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <55b4dbb29054a05d839562f6d635ce05669b016d
  3. Affected versionversion=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <af2f1932743fb52ebcb008ad7ac500d9df0aa796
  4. Affected versionversion=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <b99fd73418350dea360da8311e87a6a7b0e15a4c
  5. Affected versionversion=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <c878bea3c9d724ddfa05a813f30de3d25a0ba83f
  6. Affected versionversion=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <cc5b09cb6dacd4b32640537929ab4ee8fb2b9e04

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <55b4dbb29054a05d839562f6d635ce05669b016d; version=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <af2f1932743fb52ebcb008ad7ac500d9df0aa796; version=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <b99fd73418350dea360da8311e87a6a7b0e15a4c; version=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <c878bea3c9d724ddfa05a813f30de3d25a0ba83f; version=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <cc5b09cb6dacd4b32640537929ab4ee8fb2b9e04

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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