CVE-2024-43867

Local denial of service via uninitialized buffer reference

Published Aug 20, 2024 · Updated May 11, 2026

Refcount underflow in the Linux kernel's nouveau PRIME code allows local users to crash the system after failed GEM object initialization. In drm_gem_object_init()'s unwind path, nouveau_bo_ref() is called on an uninitialized nouveau_bo whose backing ttm_bo was never set, underflowing its reference count. Exploitation requires low-privileged local access and the affected nouveau PRIME path; the published assessment limits impact to 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

Refcount underflow in the Linux kernel's nouveau PRIME code allows local users to crash the system after failed GEM object initialization. In drm_gem_object_init()'s unwind path, nouveau_bo_ref() is called on an uninitialized nouveau_bo whose backing ttm_bo was never set, underflowing its reference count. Exploitation requires low-privileged local access and the affected nouveau PRIME path; the published assessment limits impact to system availability.

The record

CVE
CVE-2024-43867
Published
Aug 20, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-191, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2024CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.9
  2. Affected versionversion=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <16998763c62bb465ebc409d0373b9cdcef1a61a6
  3. Affected versionversion=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <2a1b327d57a8ac080977633a18999f032d7e9e3f
  4. Affected versionversion=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <3bcb8bba72ce89667fa863054956267c450c47ef
  5. Affected versionversion=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <906372e753c5027a1dc88743843b6aa2ad1aaecf
  6. Affected versionversion=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <a9bf3efc33f1fbf88787a277f7349459283c9b95
  7. Affected versionversion=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <ebebba4d357b6c67f96776a48ddbaf0060fa4c10
  8. Affected versionversion=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <f23cd66933fe76b84d8e282e5606b4d99068c320

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.9; version=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <16998763c62bb465ebc409d0373b9cdcef1a61a6; version=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <2a1b327d57a8ac080977633a18999f032d7e9e3f; version=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <3bcb8bba72ce89667fa863054956267c450c47ef; version=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <906372e753c5027a1dc88743843b6aa2ad1aaecf; version=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <a9bf3efc33f1fbf88787a277f7349459283c9b95; version=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <ebebba4d357b6c67f96776a48ddbaf0060fa4c10; version=ab9ccb96a6e6f95bcde6b8b2a524370efdbfdcd6 <f23cd66933fe76b84d8e282e5606b4d99068c320

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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-191Integer Underflow (Wrap or Wraparound)
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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