SB2026082754 - Out-of-bounds write in Linux kernel gpu drm driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-80582)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to an out-of-bounds mapping condition in the drm shmem helper huge page fault handler when installing PMD huge page mappings. A local user can trigger a huge page fault with an address range that exceeds the boundaries of the VMA to execute arbitrary code.

The issue can lead to a VM_BUG_ON_VMA() condition if the resulting mapping reaches copy_pmd_range().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/12803e89a1e593fd1e784dfe7453f5e392ccaff2
• https://git.kernel.org/stable/c/617bbd08714857c1613d7c550d43a9092ec0fb97