GHSA-P58G-V37M-9WMC
Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33In the Linux kernel, the following vulnerability has been resolved:
drm/xe/pt: prevent invalid cursor access for purged BOs
During a page table walk for binding, xe_pt_stage_bind() explicitly skips initializing the xe_res_cursor for purged BOs, treating them similarly to NULL VMAs by only setting the cursor size.
However, xe_pt_hugepte_possible() and xe_pt_scan_64K() did not check if the BO was purged before attempting to walk the cursor using xe_res_dma() and xe_res_next(). Because the cursor was left uninitialized for purged BOs, this falls through and triggers warnings like:
WARNING: drivers/gpu/drm/xe/xe_res_cursor.h:274 at xe_res_next
Fix this by explicitly checking if the BO is purged in both xe_pt_hugepte_possible() and xe_pt_scan_64K(), returning early just as we do for NULL VMAs, avoiding the invalid cursor accesses entirely.
As a precaution, also zero-initialize the cursor in xe_pt_stage_bind() to ensure we don't pass garbage data into the page table walkers if we ever hit a similar edge case in the future.
(cherry picked from commit 4c7b9c6ece32440e5a435a92076d049450cd2d2e)
{
"affected": [],
"aliases": [
"CVE-2026-72358"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T06:22:09Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/pt: prevent invalid cursor access for purged BOs\n\nDuring a page table walk for binding, xe_pt_stage_bind() explicitly\nskips initializing the xe_res_cursor for purged BOs, treating them\nsimilarly to NULL VMAs by only setting the cursor size.\n\nHowever, xe_pt_hugepte_possible() and xe_pt_scan_64K() did not check\nif the BO was purged before attempting to walk the cursor using\nxe_res_dma() and xe_res_next(). Because the cursor was left\nuninitialized for purged BOs, this falls through and triggers\nwarnings like:\n\n WARNING: drivers/gpu/drm/xe/xe_res_cursor.h:274 at xe_res_next\n\nFix this by explicitly checking if the BO is purged in both\nxe_pt_hugepte_possible() and xe_pt_scan_64K(), returning early just\nas we do for NULL VMAs, avoiding the invalid cursor accesses entirely.\n\nAs a precaution, also zero-initialize the cursor in xe_pt_stage_bind()\nto ensure we don\u0027t pass garbage data into the page table walkers\nif we ever hit a similar edge case in the future.\n\n(cherry picked from commit 4c7b9c6ece32440e5a435a92076d049450cd2d2e)",
"id": "GHSA-p58g-v37m-9wmc",
"modified": "2026-08-17T06:33:25Z",
"published": "2026-08-15T06:32:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72358"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2b6b3f98d0e93856bee38699b783c71cb0e9d67f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8a0fb57675be578c4db19deb4298ed08a70f0f1a"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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