SB20260507172 - Improper input validation in Linux kernel gpu drm driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-43169)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to improper input validation in drm/buddy allocation handling when processing allocation requests with a rounded size that exceeds the available memory manager size. A local user can submit a crafted allocation request to cause a denial of service.

The issue is triggered when size rounding for contiguous, non-contiguous, or large min_block_size allocations produces a value larger than mm->size, leading to a BUG_ON condition.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5488a29596cdba93a60a79398dc9b69d5bdadf92
• https://git.kernel.org/stable/c/6236c1cd9fdf433d39ed28b2491ccdfe7ae95061
• https://git.kernel.org/stable/c/d764b8dd420098a4d253b8a5b27568c897edb2cf
• https://git.kernel.org/stable/c/ecb32c60d8cbed2ee9ce9f343b6aa2f32babc727