Description (CNA)
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)
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ada7486c5668db542a7d361268df931aca5b726a before ffba51100ff61792fefbae11ca38ac1987a818dd; affected ada7486c5668db542a7d361268df931aca5b726a before 79f52655567a6471ff3d0d6325ede91bb14461f4; affected ada7486c5668db542a7d361268df931aca5b726a before fbbe32618e97eff81577a01eb7d9adcd64a216d7 |
| Linux / Linux | affected 6.18; unaffected 0 before 6.18; unaffected 6.18.16 through 6.18.*; unaffected 6.19.6 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ffba51100ff61792fefbae11ca38ac1987a818dd
- https://git.kernel.org/stable/c/79f52655567a6471ff3d0d6325ede91bb14461f4
- https://git.kernel.org/stable/c/fbbe32618e97eff81577a01eb7d9adcd64a216d7
ADP enrichment
No English description supplied.
No references supplied.