SB20260816436 - Use of Uninitialized Variable in Linux kernel dma-buf driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use of Uninitialized Variable (CVE-ID: CVE-2026-72095)

CWE-ID: CWE-457 - Use of Uninitialized Variable

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an uninitialized memory access in amdgpu_userq_wait_*() through dma_fence_dedup_array() when handling a zero-count fence array. A local user can trigger the zero-count condition to cause a denial of service.

The issue can occur because dma_fence_dedup_array() returns 1 for empty input, which can lead to dereference of an uninitialized fence slot.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/77a9298741f8f9e8b963c977f5582ab21c6d3427
• https://git.kernel.org/stable/c/7aa8f3dba53422465dbe1be8dbb7240304462bb2
• https://git.kernel.org/stable/c/e2d9a2ea178a5da0b4a6693e8ebca5c7fc4d7051