SB2026061026 - Improper input validation in Linux kernel drm v3d driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-46314)

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 v3d_get_extensions() and multisync extension handling in the v3d driver when processing a userspace-provided ioctl extension list. A local user can submit a self-referential extension with zero in_sync_count and out_sync_count to cause a denial of service.

The issue can result in an infinite loop in kernel context that blocks the calling thread and pegs a CPU core indefinitely.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4fa42a249e8cd6ed17aea04e5695b6e9001f2433
• https://git.kernel.org/stable/c/9c5164781cb388d219d8f49fa0f0b04cf86ad544
• https://git.kernel.org/stable/c/fb44d589bf3148e13452185a6e772a7efbf2d684