CVE-2022-49966

Local denial of service via microcode memory leak

Published Jun 18, 2025 · Updated Aug 15, 2026

A memory leak in the Sienna Cichlid AMD GPU power-management driver in Linux allows local users to exhaust kernel memory. The Sienna Cichlid pptable function table omits smu_v11_0_fini_microcode, so teardown does not invoke the cleanup paired with microcode initialization and loading. Exploitation requires local low-privileged access and the affected AMD GPU driver path; repeated leaked allocations can interrupt system availability.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A memory leak in the Sienna Cichlid AMD GPU power-management driver in Linux allows local users to exhaust kernel memory. The Sienna Cichlid pptable function table omits smu_v11_0_fini_microcode, so teardown does not invoke the cleanup paired with microcode initialization and loading. Exploitation requires local low-privileged access and the affected AMD GPU driver path; repeated leaked allocations can interrupt system availability.

The record

CVE
CVE-2022-49966
Published
Jun 18, 2025
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=6f47116e57d6288e64e4e7a40db537f0d423826d <0a2d922a5618377cdf8fa476351362733ef55342
  3. Affected versionversion=6f47116e57d6288e64e4e7a40db537f0d423826d <4d21584ac6392aa66171b7efd647ecd1a447556b
  4. Affected versionversion=6f47116e57d6288e64e4e7a40db537f0d423826d <60d522f317078381ff8a3599fe808f96fc256cd5
  5. Affected versionversion=6f47116e57d6288e64e4e7a40db537f0d423826d <a89e753d5a9f3b321f4a3098e2755c5aabcff0af

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.9; version=6f47116e57d6288e64e4e7a40db537f0d423826d <0a2d922a5618377cdf8fa476351362733ef55342; version=6f47116e57d6288e64e4e7a40db537f0d423826d <4d21584ac6392aa66171b7efd647ecd1a447556b; version=6f47116e57d6288e64e4e7a40db537f0d423826d <60d522f317078381ff8a3599fe808f96fc256cd5; version=6f47116e57d6288e64e4e7a40db537f0d423826d <a89e753d5a9f3b321f4a3098e2755c5aabcff0af

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 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

CWE-401Missing Release of Memory after Effective Lifetime

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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