CVE-2026-63840

Local privilege escalation via unsupported JPEG fence writes

Published Jul 19, 2026 · Updated Jul 19, 2026

Improper input validation in Linux Kernel 7.0 through 7.0.9 allows local users to corrupt kernel memory via AMDGPU JPEG user fences. The JPEG v5.3.0 ring accepts 64-bit user-fence submissions even though its engine cannot perform those writes safely, allowing GPU-initiated writes to attacker-chosen GPU virtual addresses. Access to a /dev/dri/renderD* node is required; the resulting primitive enables kernel disclosure, code execution, privilege escalation, or a GPU hang or reset.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Linux Kernel 7.0 through 7.0.9 allows local users to corrupt kernel memory via AMDGPU JPEG user fences. The JPEG v5.3.0 ring accepts 64-bit user-fence submissions even though its engine cannot perform those writes safely, allowing GPU-initiated writes to attacker-chosen GPU virtual addresses. Access to a /dev/dri/renderD* node is required; the resulting primitive enables kernel disclosure, code execution, privilege escalation, or a GPU hang or reset.

The record

CVE
CVE-2026-63840
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-1287, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=4aeaf3cbfa9f967e71849c66c6914ab6c2054581 <3b0ea2021351b6b813b34fac940957f1f4fad85b
  2. Affected versionversion=4aeaf3cbfa9f967e71849c66c6914ab6c2054581 <46ad73aec27d020f103b4262e4da2d2c22f54799
  3. Affected versionversion=7.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4aeaf3cbfa9f967e71849c66c6914ab6c2054581 <3b0ea2021351b6b813b34fac940957f1f4fad85b; version=4aeaf3cbfa9f967e71849c66c6914ab6c2054581 <46ad73aec27d020f103b4262e4da2d2c22f54799; version=7.0

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8kernel.orgCVSS: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.

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

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-1287Improper Validation of Specified Type of Input
T1068Exploitation for Privilege Escalation

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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