CVE-2022-49769

Kernel crash via unchecked GFS2 block-size shift

Published May 1, 2025 · Updated May 11, 2026

Out-of-bounds shifting in the Linux kernel GFS2 driver allows local users to crash the kernel by mounting a crafted filesystem image. gfs2_check_sb accepts an on-disk sb_bsize_shift that does not match sb_bsize, and gfs2_read_sb then uses the unchecked value in shift calculations. Reaching the flaw requires permission to mount a GFS2 image; exploitation can trigger a filesystem withdraw, undefined behavior, or a kernel panic.

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

Out-of-bounds shifting in the Linux kernel GFS2 driver allows local users to crash the kernel by mounting a crafted filesystem image. gfs2_check_sb accepts an on-disk sb_bsize_shift that does not match sb_bsize, and gfs2_read_sb then uses the unchecked value in shift calculations. Reaching the flaw requires permission to mount a GFS2 image; exploitation can trigger a filesystem withdraw, undefined behavior, or a kernel panic.

The record

CVE
CVE-2022-49769
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
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

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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=2.6.19
  2. Affected versionversion=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <15c83fa0fd659dd9fbdc940a560b61236e876a80
  3. Affected versionversion=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <16670534c7cff1acd918a6a5ec751b14e7436b76
  4. Affected versionversion=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <1ad197097343568066a8ffaa27ee7d0ae6d9f476
  5. Affected versionversion=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <28275a7c84d21c55ab3282d897f284d8d527173c
  6. Affected versionversion=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <5fa30be7ba81191b0a0c7239a89befc0c94286d5
  7. Affected versionversion=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <670f8ce56dd0632dc29a0322e188cc73ce3c6b92
  8. Affected versionversion=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <8b6534c9ae9dba5489703a19d8ba6c8f2cfa33c2
  9. Affected versionversion=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <d6b1e8ea6f3418c3b461ad5a35cdc93c996b2c87

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.19; version=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <15c83fa0fd659dd9fbdc940a560b61236e876a80; version=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <16670534c7cff1acd918a6a5ec751b14e7436b76; version=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <1ad197097343568066a8ffaa27ee7d0ae6d9f476; version=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <28275a7c84d21c55ab3282d897f284d8d527173c; version=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <5fa30be7ba81191b0a0c7239a89befc0c94286d5; version=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <670f8ce56dd0632dc29a0322e188cc73ce3c6b92; version=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <8b6534c9ae9dba5489703a19d8ba6c8f2cfa33c2; version=b3b94faa5fe5968827ba0640ee9fba4b3e7f736e <d6b1e8ea6f3418c3b461ad5a35cdc93c996b2c87

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CanonicalCVSS: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 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

T1499.004Application or System Exploitation

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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