CVE-2026-63856

high

Description

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)

References

https://git.kernel.org/stable/c/f264019be80de79f84f464846451445923bffea0

https://git.kernel.org/stable/c/c71aecae98e42dcf2baf462df50b3a2cf1a93fe4

https://git.kernel.org/stable/c/ac06ce5cac9e711281585d09d00c6efcd9b86396

https://git.kernel.org/stable/c/8d80b293b41fcb5e9396db93e788b0f4ebcbafb7

https://git.kernel.org/stable/c/5e777bc4cbe928ac0fd95e368fee1540f2ce4db2

Details

Source: Mitre, NVD

Published: 2026-07-19

Updated: 2026-07-20

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

Severity: Medium

CVSS v3

Base Score: 7.8

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00157