CVE-2026-43280 — linux / linux_kernel
Out-of-bounds ReadIn 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)
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 6.18 | 6.18.16 |
| linux / linux_kernel | 6.19 | 6.19.6 |
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