Answer in brief
CVE-2026-63856 records a Unknown severity vulnerability in drm/amdgpu/vcn: set no_user_fence for VCN v2.0 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 | >=1b61de45dfaff00b627e47349a019658e39268b9 <f264019be80de79f84f464846451445923bffea0 || >=1b61de45dfaff00b627e47349a019658e39268b9 <5e777bc4cbe928ac0fd95e368fee1540f2ce4db2 || >=1b61de45dfaff00b627e47349a019658e39268b9 <ac06ce5cac9e711281585d09d00c6efcd9b86396 || >=1b61de45dfaff00b627e47349a019658e39268b9 <c71aecae98e42dcf2baf462df50b3a2cf1a93fe4 || >=1b61de45dfaff00b627e47349a019658e39268b9 <8d80b293b41fcb5e9396db93e788b0f4ebcbafb7 | f264019be80de79f84f464846451445923bffea0, 5e777bc4cbe928ac0fd95e368fee1540f2ce4db2, ac06ce5cac9e711281585d09d00c6efcd9b86396, c71aecae98e42dcf2baf462df50b3a2cf1a93fe4, 8d80b293b41fcb5e9396db93e788b0f4ebcbafb7 |
| Linux/Linuxgeneric | 5.3 | 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 v2.0 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 e2b5499fca55f1a32960a311bbb62e35891eaf73)
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-63856 records a Unknown severity vulnerability in drm/amdgpu/vcn: set no_user_fence for VCN v2.0 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 | >=1b61de45dfaff00b627e47349a019658e39268b9 <f264019be80de79f84f464846451445923bffea0 || >=1b61de45dfaff00b627e47349a019658e39268b9 <5e777bc4cbe928ac0fd95e368fee1540f2ce4db2 || >=1b61de45dfaff00b627e47349a019658e39268b9 <ac06ce5cac9e711281585d09d00c6efcd9b86396 || >=1b61de45dfaff00b627e47349a019658e39268b9 <c71aecae98e42dcf2baf462df50b3a2cf1a93fe4 || >=1b61de45dfaff00b627e47349a019658e39268b9 <8d80b293b41fcb5e9396db93e788b0f4ebcbafb7 | f264019be80de79f84f464846451445923bffea0, 5e777bc4cbe928ac0fd95e368fee1540f2ce4db2, ac06ce5cac9e711281585d09d00c6efcd9b86396, c71aecae98e42dcf2baf462df50b3a2cf1a93fe4, 8d80b293b41fcb5e9396db93e788b0f4ebcbafb7 |
| Linux/Linuxgeneric | 5.3 | 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 v2.0 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 e2b5499fca55f1a32960a311bbb62e35891eaf73)
Quoted source text, attributed separately from HOL analysis.