CVE-2026-31488

Local kernel memory corruption via discarded mode change

Published Apr 22, 2026 · Updated Apr 22, 2026

Use-after-free in the Linux kernel AMD display driver allows local users to corrupt kernel memory through concurrent display-state changes. During pre_validate_dsc(), amdgpu incorrectly clears a CRTC's mode_changed flag when DSC timing is unchanged, discarding an unrelated mode change after new streams have already been created. Triggering the flaw requires AMD display hardware and a KMS commit that combines an MST/DSC reconfiguration with another CRTC mode change; the stale stream leaks and is later accessed after release when disabled.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel AMD display driver allows local users to corrupt kernel memory through concurrent display-state changes. During pre_validate_dsc(), amdgpu incorrectly clears a CRTC's mode_changed flag when DSC timing is unchanged, discarding an unrelated mode change after new streams have already been created. Triggering the flaw requires AMD display hardware and a KMS commit that combines an MST/DSC reconfiguration with another CRTC mode change; the stale stream leaks and is later accessed after release when disabled.

The record

CVE
CVE-2026-31488
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-1288, CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b <10862e344b4d6434642a48c87d765813fc0b0ba7
  2. Affected versionversion=17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b <111208b5b7ebcdadb3f922cc52d8425f0fa91b33
  3. Affected versionversion=17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b <8a5edc97fd9c6415ff2eff872748439a97e3c3d8
  4. Affected versionversion=17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b <aed3d041ab061ec8a64f50a3edda0f4db7280025
  5. Affected versionversion=5.18

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b <10862e344b4d6434642a48c87d765813fc0b0ba7; version=17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b <111208b5b7ebcdadb3f922cc52d8425f0fa91b33; version=17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b <8a5edc97fd9c6415ff2eff872748439a97e3c3d8; version=17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b <aed3d041ab061ec8a64f50a3edda0f4db7280025; version=5.18

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-1288Improper Validation of Consistency within Input
CWE-416Use After Free

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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