CVE-2024-56776

Kernel crash via unchecked CRTC state error

Published Jan 8, 2025 · Updated May 11, 2026

Improper error handling in the DRM/STI cursor code allows local users to crash Linux through a failed atomic CRTC state lookup. The sti_cursor_atomic_check function dereferences an error pointer returned by drm_atomic_get_crtc_state instead of testing it with IS_ERR. Exploitation requires local low-privileged access to a system using the DRM/STI cursor path; confidentiality and integrity are unaffected.

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

Improper error handling in the DRM/STI cursor code allows local users to crash Linux through a failed atomic CRTC state lookup. The sti_cursor_atomic_check function dereferences an error pointer returned by drm_atomic_get_crtc_state instead of testing it with IS_ERR. Exploitation requires local low-privileged access to a system using the DRM/STI cursor path; confidentiality and integrity are unaffected.

The record

CVE
CVE-2024-56776
Published
Jan 8, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-754, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 8, 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

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=4.6
  2. Affected versionversion=dd86dc2f9ae1102f46115be1f1422265c15540f1 <40725c5fabee804fecce41d4d5c5bae80c45e1c4
  3. Affected versionversion=dd86dc2f9ae1102f46115be1f1422265c15540f1 <831214f77037de02afc287eae93ce97f218d8c04
  4. Affected versionversion=dd86dc2f9ae1102f46115be1f1422265c15540f1 <8ab73ac97c0fa528f66eeccd9bb53eb6eb7d20dc
  5. Affected versionversion=dd86dc2f9ae1102f46115be1f1422265c15540f1 <e98ff67f5a68114804607de549c2350d27628fc7
  6. Affected versionversion=dd86dc2f9ae1102f46115be1f1422265c15540f1 <f67786293193cf01ebcc6fdbcbd1587b24f52679

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.6; version=dd86dc2f9ae1102f46115be1f1422265c15540f1 <40725c5fabee804fecce41d4d5c5bae80c45e1c4; version=dd86dc2f9ae1102f46115be1f1422265c15540f1 <831214f77037de02afc287eae93ce97f218d8c04; version=dd86dc2f9ae1102f46115be1f1422265c15540f1 <8ab73ac97c0fa528f66eeccd9bb53eb6eb7d20dc; version=dd86dc2f9ae1102f46115be1f1422265c15540f1 <e98ff67f5a68114804607de549c2350d27628fc7; version=dd86dc2f9ae1102f46115be1f1422265c15540f1 <f67786293193cf01ebcc6fdbcbd1587b24f52679

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-754Improper Check for Unusual or Exceptional Conditions
T1499Endpoint Denial of Service

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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