CVE-2022-49827

Local system crash via NULL worker cleanup

Published May 1, 2025 · Updated May 11, 2026

NULL pointer dereference in DRM vblank cleanup in the Linux kernel allows local users to crash the system during module initialization. When __drmm_add_action() fails during drm_vblank_init(), cleanup invokes drm_vblank_init_release() even though the vblank worker is NULL, and kthread_destroy_worker() dereferences it. Triggering the failure path requires local low-privileged access and DRM module initialization; the bounded consequence is a kernel crash and service interruption.

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

NULL pointer dereference in DRM vblank cleanup in the Linux kernel allows local users to crash the system during module initialization. When __drmm_add_action() fails during drm_vblank_init(), cleanup invokes drm_vblank_init_release() even though the vblank worker is NULL, and kthread_destroy_worker() dereferences it. Triggering the failure path requires local low-privileged access and DRM module initialization; the bounded consequence is a kernel crash and service interruption.

The record

CVE
CVE-2022-49827
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, 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=5.9
  2. Affected versionversion=5e6c2b4f916157e8f10d093d43e88b2a250d1774 <1d160dfb3fdf11ba9447e862c548447f91f4e74a
  3. Affected versionversion=5e6c2b4f916157e8f10d093d43e88b2a250d1774 <3acd2016421b2e628acad65495d15493bf7a3bc3
  4. Affected versionversion=5e6c2b4f916157e8f10d093d43e88b2a250d1774 <4979524f5a2a8210e87fde2f642b0dc060860821
  5. Affected versionversion=5e6c2b4f916157e8f10d093d43e88b2a250d1774 <e884a6c2d49a6c12761e5bed851e9fe93bd923a1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.9; version=5e6c2b4f916157e8f10d093d43e88b2a250d1774 <1d160dfb3fdf11ba9447e862c548447f91f4e74a; version=5e6c2b4f916157e8f10d093d43e88b2a250d1774 <3acd2016421b2e628acad65495d15493bf7a3bc3; version=5e6c2b4f916157e8f10d093d43e88b2a250d1774 <4979524f5a2a8210e87fde2f642b0dc060860821; version=5e6c2b4f916157e8f10d093d43e88b2a250d1774 <e884a6c2d49a6c12761e5bed851e9fe93bd923a1

Published CVSS scores

5.5Amazon LinuxCVSS: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

CWE-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application 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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