Answer in brief
CVE-2026-63855 records a Unknown severity vulnerability in drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=28c17d72072b7ce5cc13a527dcbfc045cc995e7d <2c6fb056567efb49f8674108b86088a1cfaa86d0 || >=28c17d72072b7ce5cc13a527dcbfc045cc995e7d <8f0ea4524dc71c6c9ec97f2711f46e12f624140f || >=28c17d72072b7ce5cc13a527dcbfc045cc995e7d <602d4c5872b25ddd4d82fb2025efb9a05b187bb3 || >=28c17d72072b7ce5cc13a527dcbfc045cc995e7d <5a3c6f76cab164a5d803084908d7050f649ab7f9 || >=28c17d72072b7ce5cc13a527dcbfc045cc995e7d <4f317863a3ab212a027d8c8c3cc3af4e3fb95704 | 2c6fb056567efb49f8674108b86088a1cfaa86d0, 8f0ea4524dc71c6c9ec97f2711f46e12f624140f, 602d4c5872b25ddd4d82fb2025efb9a05b187bb3, 5a3c6f76cab164a5d803084908d7050f649ab7f9, 4f317863a3ab212a027d8c8c3cc3af4e3fb95704 |
| Linux/Linuxgeneric | 5.4 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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)
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-63855 records a Unknown severity vulnerability in drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=28c17d72072b7ce5cc13a527dcbfc045cc995e7d <2c6fb056567efb49f8674108b86088a1cfaa86d0 || >=28c17d72072b7ce5cc13a527dcbfc045cc995e7d <8f0ea4524dc71c6c9ec97f2711f46e12f624140f || >=28c17d72072b7ce5cc13a527dcbfc045cc995e7d <602d4c5872b25ddd4d82fb2025efb9a05b187bb3 || >=28c17d72072b7ce5cc13a527dcbfc045cc995e7d <5a3c6f76cab164a5d803084908d7050f649ab7f9 || >=28c17d72072b7ce5cc13a527dcbfc045cc995e7d <4f317863a3ab212a027d8c8c3cc3af4e3fb95704 | 2c6fb056567efb49f8674108b86088a1cfaa86d0, 8f0ea4524dc71c6c9ec97f2711f46e12f624140f, 602d4c5872b25ddd4d82fb2025efb9a05b187bb3, 5a3c6f76cab164a5d803084908d7050f649ab7f9, 4f317863a3ab212a027d8c8c3cc3af4e3fb95704 |
| Linux/Linuxgeneric | 5.4 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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)
Quoted source text, attributed separately from HOL analysis.