CVE-2022-49055

Kernel crash via unchecked event waiter allocation

Published Feb 26, 2025 · Updated May 11, 2026

Null-pointer dereference in Linux kernel AMD KFD event handling allows local users to crash the kernel when event-waiter allocation fails. The event creation path in drivers/gpu/drm/amd/amdkfd/kfd_events.c dereferences event_waiters[i].wait without checking whether kmalloc_array() returned null. A low-privileged local user must reach AMD KFD event creation under memory pressure; the documented consequence is a kernel crash, not data access or modification.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Null-pointer dereference in Linux kernel AMD KFD event handling allows local users to crash the kernel when event-waiter allocation fails. The event creation path in drivers/gpu/drm/amd/amdkfd/kfd_events.c dereferences event_waiters[i].wait without checking whether kmalloc_array() returned null. A low-privileged local user must reach AMD KFD event creation under memory pressure; the documented consequence is a kernel crash, not data access or modification.

The record

CVE
CVE-2022-49055
Published
Feb 26, 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. 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=4.2
  2. Affected versionversion=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <0a692c625e373fef692ffbc7fc41f8a025f01cb7
  3. Affected versionversion=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <1d7a5aae884ca727d41c7ed15d4c82fdb67c040c
  4. Affected versionversion=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <32cf90a521dcc0f136db7ee5ba32bfe5f79e460e
  5. Affected versionversion=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <40bf32dbfef866c83a3e74800b81d79e52b6d20b
  6. Affected versionversion=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <94869bb0de69a812f70231b0eb480bb2f7ae73a6
  7. Affected versionversion=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <c7a268b33882d5feaafd29c1734456f41ba41396
  8. Affected versionversion=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <ebbb7bb9e80305820dc2328a371c1b35679f2667
  9. Affected versionversion=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <f2658d5966bcee8c3eb487875f459756d4f7cdfc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.2; version=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <0a692c625e373fef692ffbc7fc41f8a025f01cb7; version=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <1d7a5aae884ca727d41c7ed15d4c82fdb67c040c; version=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <32cf90a521dcc0f136db7ee5ba32bfe5f79e460e; version=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <40bf32dbfef866c83a3e74800b81d79e52b6d20b; version=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <94869bb0de69a812f70231b0eb480bb2f7ae73a6; version=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <c7a268b33882d5feaafd29c1734456f41ba41396; version=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <ebbb7bb9e80305820dc2328a371c1b35679f2667; version=f3a398183f7b9ef78f6b71ee9f7641e046403bcb <f2658d5966bcee8c3eb487875f459756d4f7cdfc

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS: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
T1499.004Application or System Exploitation

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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