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CVE-2026-63856

HIGHCVSS 7.8/10EPSS 0.12%

Last modified

CVE-2026-63856 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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). EPSS estimates a 0.12% chance of exploitation in the next 30 days.

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)

Metrics

CVSS 3.1
7.8/10

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

EPSS Probability
0.12%

2.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1b61de45dfaff00b627e47349a019658e39268b9, < f264019be80de79f84f464846451445923bffea0; >= 1b61de45dfaff00b627e47349a019658e39268b9, < 5e777bc4cbe928ac0fd95e368fee1540f2ce4db2; >= 1b61de45dfaff00b627e47349a019658e39268b9, < ac06ce5cac9e711281585d09d00c6efcd9b86396; >= 1b61de45dfaff00b627e47349a019658e39268b9, < c71aecae98e42dcf2baf462df50b3a2cf1a93fe4; >= 1b61de45dfaff00b627e47349a019658e39268b9, < 8d80b293b41fcb5e9396db93e788b0f4ebcbafb7
LinuxLinux5.3

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-63856?
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)
How severe is CVE-2026-63856?
CVE-2026-63856 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.12% probability of exploitation in the next 30 days.
How do I fix CVE-2026-63856?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST