Linux Kernel up to 6.18.32/7.0.9 Vcn Encoder drm/amdgpu/vcn set_no_user_fence

Summaryinfo

A vulnerability labeled as problematic has been found in Linux Kernel up to 6.18.32/7.0.9. The affected element is the function set_no_user_fence of the file drm/amdgpu/vcn of the component Vcn Encoder. The manipulation of the argument user_fence results in an unknown weakness. This vulnerability is identified as CVE-2026-63849. The attack is only possible with local access. There is not any exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.32/7.0.9. It has been classified as problematic. Affected is the function set_no_user_fence of the file drm/amdgpu/vcn of the component Vcn Encoder. The manipulation of the argument user_fence with an unknown input leads to a unknown weakness. This is going to have an impact on integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: set no_user_fence for VCN v5.0.1 enc ring VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit e16be95a2c3ee712b142cb27d2dca0b461181359)

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-63849 since 07/19/2026. The exploitability is told to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/19/2026).

Upgrading to version 6.18.33 or 7.0.10 eliminates this vulnerability.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
• 6.18.15
• 6.18.16
• 6.18.17
• 6.18.18
• 6.18.19
• 6.18.20
• 6.18.21
• 6.18.22
• 6.18.23
• 6.18.24
• 6.18.25
• 6.18.26
• 6.18.27
• 6.18.28
• 6.18.29
• 6.18.30
• 6.18.31
• 6.18.32
• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9

License

• open-source

Website

• Vendor: https://www.kernel.org/

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