CVE-2026-43280

In the Linux kernel, the following vulnerability has been resolved:

drm/xe: Add bounds check on pat_index to prevent OOB kernel read in madvise

When user provides a bogus pat_index value through the madvise IOCTL, the

xe_pat_index_get_coh_mode() function performs an array access without

validating bounds. This allows a malicious user to trigger an out-of-bounds

kernel read from the xe->pat.table array.

The vulnerability exists because the validation in madvise_args_are_sane()

directly calls xe_pat_index_get_coh_mode(xe, args->pat_index.val) without

first checking if pat_index is within [0, xe->pat.n_entries).

Although xe_pat_index_get_coh_mode() has a WARN_ON to catch this in debug

builds, it still performs the unsafe array access in production kernels.

v2(Matthew Auld)

- Using array_index_nospec() to mitigate spectre attacks when the value

is used

v3(Matthew Auld)

- Put the declarations at the start of the block

(cherry picked from commit 944a3329b05510d55c69c2ef455136e2fc02de29)