CVE-2026-63846

GPU memory corruption via unsupported user fences

Published Jul 19, 2026 · Updated Jul 19, 2026

Memory corruption in the AMDGPU JPEG v3.0 ring in Linux Kernel allows local users to corrupt GPU memory via a crafted command submission. The ring accepts AMDGPU_CHUNK_ID_FENCE even though JPEG v3.0 cannot perform 64-bit user-fence writes, causing GPCOM to write a sequence number to an attacker-influenced GPU virtual address. Access to an AMDGPU render node on affected VCN 3.0.x hardware is required; exploitation can disclose or corrupt GPU memory or hang GPU workloads until reset.

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

Memory corruption in the AMDGPU JPEG v3.0 ring in Linux Kernel allows local users to corrupt GPU memory via a crafted command submission. The ring accepts AMDGPU_CHUNK_ID_FENCE even though JPEG v3.0 cannot perform 64-bit user-fence writes, causing GPCOM to write a sequence number to an attacker-influenced GPU virtual address. Access to an AMDGPU render node on affected VCN 3.0.x hardware is required; exploitation can disclose or corrupt GPU memory or hang GPU workloads until reset.

The record

CVE
CVE-2026-63846
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
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=5.9
  2. Affected versionversion=dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 <303da8279f195cc741adc52c1b44d6b64de63bb0
  3. Affected versionversion=dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 <48ce00787e3fddd2b45692fc991b8ab128343da5
  4. Affected versionversion=dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 <5ada37d7f736f9feeaa06a25e470a4c74e67a61a
  5. Affected versionversion=dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 <a2baf12eec41f246689e6a3f8619af1200031576
  6. Affected versionversion=dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 <ee035a9d3eed3a9f5a3e83c31a10b321c9598861

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.9; version=dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 <303da8279f195cc741adc52c1b44d6b64de63bb0; version=dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 <48ce00787e3fddd2b45692fc991b8ab128343da5; version=dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 <5ada37d7f736f9feeaa06a25e470a4c74e67a61a; version=dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 <a2baf12eec41f246689e6a3f8619af1200031576; version=dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 <ee035a9d3eed3a9f5a3e83c31a10b321c9598861

Published CVSS scores

7.8LinuxCVSS: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

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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