FKIE_CVE-2026-72358

Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-17 06:18
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In 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)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2b6b3f98d0e93856bee38699b783c71cb0e9d67f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8a0fb57675be578c4db19deb4298ed08a70f0f1a
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/xe/xe_pt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2b6b3f98d0e93856bee38699b783c71cb0e9d67f",
              "status": "affected",
              "version": "ad9843aac91a1eda12912a4922042ea04cfc29dc",
              "versionType": "git"
            },
            {
              "lessThan": "8a0fb57675be578c4db19deb4298ed08a70f0f1a",
              "status": "affected",
              "version": "ad9843aac91a1eda12912a4922042ea04cfc29dc",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/xe/xe_pt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-72358",
  "lastModified": "2026-08-17T06:18:39.997",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-15T06:22:09.243",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2b6b3f98d0e93856bee38699b783c71cb0e9d67f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8a0fb57675be578c4db19deb4298ed08a70f0f1a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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