CVE-2026-63855
drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings
Description
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit efc9dd5590894109bce9a0bfe1fa5592dd6b20b1)
INFO
Published Date :
July 19, 2026, 3:16 p.m.
Last Modified :
July 19, 2026, 3:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-63855
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel.
- Apply the vendor patch for the VCN issue.
- Configure VCN rings with no_user_fence.
- Reject submissions with user fences.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-63855.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63855 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-63855
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-63855 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63855 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '28c17d72072b7ce5cc13a527dcbfc045cc995e7d', 'lessThan': '2c6fb056567efb49f8674108b86088a1cfaa86d0', 'versionType': 'git'}, {'status': 'affected', 'version': '28c17d72072b7ce5cc13a527dcbfc045cc995e7d', 'lessThan': '8f0ea4524dc71c6c9ec97f2711f46e12f624140f', 'versionType': 'git'}, {'status': 'affected', 'version': '28c17d72072b7ce5cc13a527dcbfc045cc995e7d', 'lessThan': '602d4c5872b25ddd4d82fb2025efb9a05b187bb3', 'versionType': 'git'}, {'status': 'affected', 'version': '28c17d72072b7ce5cc13a527dcbfc045cc995e7d', 'lessThan': '5a3c6f76cab164a5d803084908d7050f649ab7f9', 'versionType': 'git'}, {'status': 'affected', 'version': '28c17d72072b7ce5cc13a527dcbfc045cc995e7d', 'lessThan': '4f317863a3ab212a027d8c8c3cc3af4e3fb95704', 'versionType': 'git'}], 'programFiles': ['drivers/gpu/drm/amd/amdgpu/vcn_v2_5.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.141', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.91', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.33', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.10', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/gpu/drm/amd/amdgpu/vcn_v2_5.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit efc9dd5590894109bce9a0bfe1fa5592dd6b20b1) Added Reference https://git.kernel.org/stable/c/2c6fb056567efb49f8674108b86088a1cfaa86d0 Added Reference https://git.kernel.org/stable/c/4f317863a3ab212a027d8c8c3cc3af4e3fb95704 Added Reference https://git.kernel.org/stable/c/5a3c6f76cab164a5d803084908d7050f649ab7f9 Added Reference https://git.kernel.org/stable/c/602d4c5872b25ddd4d82fb2025efb9a05b187bb3 Added Reference https://git.kernel.org/stable/c/8f0ea4524dc71c6c9ec97f2711f46e12f624140f