CVE-2022-49337

Local privilege escalation via dlmfs use-after-free

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel OCFS2 dlmfs allows local users to crash the kernel or escalate privileges through lock inode operations. After user_dlm_destroy_lock fails, it leaves USER_LOCK_IN_TEARDOWN or USER_LOCK_BUSY set, so a later unlink frees an inode while its DLM lock remains linked. Exploitation requires local write access to a mounted dlmfs domain; a subsequent blocking AST reaches the freed lock object and can panic the kernel or enable kernel-level code execution.

CVSS severity7.8
High
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

Use-after-free in Linux kernel OCFS2 dlmfs allows local users to crash the kernel or escalate privileges through lock inode operations. After user_dlm_destroy_lock fails, it leaves USER_LOCK_IN_TEARDOWN or USER_LOCK_BUSY set, so a later unlink frees an inode while its DLM lock remains linked. Exploitation requires local write access to a mounted dlmfs domain; a subsequent blocking AST reaches the freed lock object and can panic the kernel or enable kernel-level code execution.

The record

CVE
CVE-2022-49337
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=2.6.17
  2. Affected versionversion=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <02480e2e82ae0e5588374bbbcf4fa6e4959fa174
  3. Affected versionversion=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <1434cd71ad9f3a6beda3036972983b6c4869207c
  4. Affected versionversion=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <2c5e26a626fe46675bceba853e12aaf13c712e10
  5. Affected versionversion=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <337e36550788dbe03254f0593a231c1c4873b20d
  6. Affected versionversion=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <733a35c00ef363a1c774d7ea486e0735b7c13a15
  7. Affected versionversion=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <82bf8e7271fade40184177cb406203addc34c4a0
  8. Affected versionversion=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <863e0d81b6683c4cbc588ad831f560c90e494bef
  9. Affected versionversion=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <9c96238fac045b289993d7bc5aae7b2d72b25c76
  10. Affected versionversion=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <efb54ec548829e1d3605f0434526f86e345b1b28

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.17; version=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <02480e2e82ae0e5588374bbbcf4fa6e4959fa174; version=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <1434cd71ad9f3a6beda3036972983b6c4869207c; version=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <2c5e26a626fe46675bceba853e12aaf13c712e10; version=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <337e36550788dbe03254f0593a231c1c4873b20d; version=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <733a35c00ef363a1c774d7ea486e0735b7c13a15; version=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <82bf8e7271fade40184177cb406203addc34c4a0; version=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <863e0d81b6683c4cbc588ad831f560c90e494bef; version=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <9c96238fac045b289993d7bc5aae7b2d72b25c76; version=2cd9888590c52ac7592e3607d0a3174ccd57ef86 <efb54ec548829e1d3605f0434526f86e345b1b28

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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