What’s Vulnerable › Vulnerabilities

CVE-2026-63856: drm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-10-30
• Weakness: CWE-20

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)

Affected products

• Linux kernel: from 5.3 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10; 7.1-rc1 — fixed in 6.6.141, 6.12.91, 6.18.33, 7.0.10
• Linux: 5.3 — fixed in 7.1

How to fix

Upgrade to a fixed version: Linux kernel 6.6.141, 6.12.91, 6.18.33, 7.0.10; Linux 7.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/5e777bc4cbe928ac0fd95e368fee1540f2ce4db2
• https://git.kernel.org/stable/c/8d80b293b41fcb5e9396db93e788b0f4ebcbafb7
• https://git.kernel.org/stable/c/ac06ce5cac9e711281585d09d00c6efcd9b86396
• https://git.kernel.org/stable/c/bcb972496f189edbf56a18b14f9b4831fd127ab8
• https://git.kernel.org/stable/c/c71aecae98e42dcf2baf462df50b3a2cf1a93fe4
• https://git.kernel.org/stable/c/f264019be80de79f84f464846451445923bffea0

Get alerted when CVE-2026-63856 or the next vulnerability affects your stack