SB20261023167 - Integer underflow in Linux kernel drm imagination driver

Description

This security bulletin contains information about 1 vulnerability.

1) Integer underflow (CVE-ID: CVE-2026-99004)

CWE-ID: CWE-191 - Integer underflow

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 by exhausting system memory and triggering an out-of-memory kernel panic.

The vulnerability exists due to an integer underflow in pvr_mmu_op_context_create() in the Linux kernel's Imagination GPU driver when calculating page table preallocation counts for a mapping that crosses a page table boundary. A local user can trigger such a mapping to cause excessive MMU page allocation, exhausting system memory and triggering an out-of-memory kernel panic.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/51b56bad96fd20127034f660b337c00317c65151
• https://git.kernel.org/stable/c/789f290b2e81d42820bddcb4010ffbc2ae2ded54
• https://git.kernel.org/stable/c/7f73da0facf864fe796371ebaccacb1fee678aaf
• https://git.kernel.org/stable/c/f9b215b3e37a5047c406545de51bf8a2aeb4cd1c