CVE-2026-63853

Local video-processing interruption via unsupported user fences

Published Jul 19, 2026 · Updated Jul 19, 2026

Improper input validation in Linux Kernel 5.19 and later allows local users to interrupt AMDGPU VCN video processing via crafted command submissions. The VCN v4.0 encoder ring fails to set no_user_fence, so command submission accepts a 64-bit user fence that the VCN encoder and decoder rings cannot write. Low-privilege local access to an AMD VCN 4.0 device is required; the unsupported fence causes command submissions to be rejected, interrupting video encoding or decoding.

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 5.19 and later allows local users to interrupt AMDGPU VCN video processing via crafted command submissions. The VCN v4.0 encoder ring fails to set no_user_fence, so command submission accepts a 64-bit user fence that the VCN encoder and decoder rings cannot write. Low-privilege local access to an AMD VCN 4.0 device is required; the unsupported fence causes command submissions to be rejected, interrupting video encoding or decoding.

The record

CVE
CVE-2026-63853
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-1287, T1499
Attack vector
local
Privileges
Unavailable

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=5.19
  2. Affected versionversion=8da1170a16e4d4b49fa07d1f75ad480847ff7eca <1286b6872de0aee1feeeaa6dbac86369806de9a5
  3. Affected versionversion=8da1170a16e4d4b49fa07d1f75ad480847ff7eca <51f694221047c84fa185be98210eb2c354ffb8c6
  4. Affected versionversion=8da1170a16e4d4b49fa07d1f75ad480847ff7eca <6bdd2ed6458d35c368fbe9550a4d7f342abd3a92

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.19; version=8da1170a16e4d4b49fa07d1f75ad480847ff7eca <1286b6872de0aee1feeeaa6dbac86369806de9a5; version=8da1170a16e4d4b49fa07d1f75ad480847ff7eca <51f694221047c84fa185be98210eb2c354ffb8c6; version=8da1170a16e4d4b49fa07d1f75ad480847ff7eca <6bdd2ed6458d35c368fbe9550a4d7f342abd3a92

Published CVSS scores

7.8Linux 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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1287Improper Validation of Specified Type of Input
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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