Vulnerability-Lookup

GHSA-C2VC-WWPC-95XX

Vulnerability from github – Published: 2026-10-28 12:31 – Updated: 2026-10-28 12:31

Details

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

drm/xe: skip eviction of a BO with no resource

xe_evict_flags() switches on tbo->resource->mem_type to choose an eviction placement. An xe BO can reach eviction with no ttm.resource, e.g. an imported dma-buf BO whose resource was freed during teardown while its attachment is still live: the exporter then invalidates it via xe_dma_buf_move_notify() -> xe_bo_evict(), and the switch dereferences a NULL resource and faults.

A BO with no resource has nothing placed or mapped, so there is nothing to evict. Return an empty placement (num_placement = 0), mirroring the handling already used for non-xe scatter-gather BOs just above; ttm_bo_validate() then takes the pipeline-gutting path and returns 0.

Without the fix the xe_dma_buf@xe_test_dmabuf_move_notify_no_resource dynamic live selftest will fail with below stack.

BUG: kernel NULL pointer dereference, address: 0000000000000010 RIP: 0010:xe_evict_flags+0xf4/0x140 [xe] Call Trace: xe_bo_evict+0x40/0xa0 [xe] ? ttm_bo_pipeline_gutting+0x71/0x180 [ttm] xe_test_dmabuf_move_notify_no_resource+0x182/0x440 [xe] xe_dma_buf_kunit+0x387/0x580 [xe]

v2: Add Fixes tag and failure info in commit text (Matt Brost)

(cherry picked from commit dbcfaac6331f1fcb0c2fe3ad3e9adb1e5d43ec0c)

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{
  "affected": [],
  "aliases": [
    "CVE-2026-99209"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-28T11:17:42Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: skip eviction of a BO with no resource\n\nxe_evict_flags() switches on tbo-\u003eresource-\u003emem_type to choose an\neviction placement. An xe BO can reach eviction with no ttm.resource,\ne.g. an imported dma-buf BO whose resource was freed during teardown\nwhile its attachment is still live: the exporter then invalidates it via\nxe_dma_buf_move_notify() -\u003e xe_bo_evict(), and the switch dereferences a\nNULL resource and faults.\n\nA BO with no resource has nothing placed or mapped, so there is nothing\nto evict. Return an empty placement (num_placement = 0), mirroring the\nhandling already used for non-xe scatter-gather BOs just above;\nttm_bo_validate() then takes the pipeline-gutting path and returns 0.\n\nWithout the fix the xe_dma_buf@xe_test_dmabuf_move_notify_no_resource\ndynamic live selftest will fail with below stack.\n\nBUG: kernel NULL pointer dereference, address: 0000000000000010\nRIP: 0010:xe_evict_flags+0xf4/0x140 [xe]\nCall Trace:\n \u003cTASK\u003e\n xe_bo_evict+0x40/0xa0 [xe]\n ? ttm_bo_pipeline_gutting+0x71/0x180 [ttm]\n xe_test_dmabuf_move_notify_no_resource+0x182/0x440 [xe]\n xe_dma_buf_kunit+0x387/0x580 [xe]\n\nv2: Add Fixes tag and failure info in commit text (Matt Brost)\n\n(cherry picked from commit dbcfaac6331f1fcb0c2fe3ad3e9adb1e5d43ec0c)",
  "id": "GHSA-c2vc-wwpc-95xx",
  "modified": "2026-10-28T12:31:08Z",
  "published": "2026-10-28T12:31:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99209"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/448e76cbdc6652ccd3ba337b7a6e1f028859f2ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6046bb9cb2859e3d9bf939e4d6527f3827e1096f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6499d19ade1f1e4a1e6b739abc8c815297c98b8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-99209 (GCVE-0-2026-99209)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:36 – Updated: 2026-10-28 10:36

Title

drm/xe: skip eviction of a BO with no resource

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/xe: skip eviction of a BO with no resource xe_evict_flags() switches on tbo->resource->mem_type to choose an eviction placement. An xe BO can reach eviction with no ttm.resource, e.g. an imported dma-buf BO whose resource was freed during teardown while its attachment is still live: the exporter then invalidates it via xe_dma_buf_move_notify() -> xe_bo_evict(), and the switch dereferences a NULL resource and faults. A BO with no resource has nothing placed or mapped, so there is nothing to evict. Return an empty placement (num_placement = 0), mirroring the handling already used for non-xe scatter-gather BOs just above; ttm_bo_validate() then takes the pipeline-gutting path and returns 0. Without the fix the xe_dma_buf@xe_test_dmabuf_move_notify_no_resource dynamic live selftest will fail with below stack. BUG: kernel NULL pointer dereference, address: 0000000000000010 RIP: 0010:xe_evict_flags+0xf4/0x140 [xe] Call Trace: <TASK> xe_bo_evict+0x40/0xa0 [xe] ? ttm_bo_pipeline_gutting+0x71/0x180 [ttm] xe_test_dmabuf_move_notify_no_resource+0x182/0x440 [xe] xe_dma_buf_kunit+0x387/0x580 [xe] v2: Add Fixes tag and failure info in commit text (Matt Brost) (cherry picked from commit dbcfaac6331f1fcb0c2fe3ad3e9adb1e5d43ec0c)

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7033 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/6046bb9cb2859e3d9…
https://git.kernel.org/stable/c/b6499d19ade1f1e4a…
https://git.kernel.org/stable/c/448e76cbdc6652ccd…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: dd08ebf6c3525a7ea2186e636df064ea47281987 , < 6046bb9cb2859e3d9bf939e4d6527f3827e1096f (git) Affected: dd08ebf6c3525a7ea2186e636df064ea47281987 , < b6499d19ade1f1e4a1e6b739abc8c815297c98b8 (git) Affected: dd08ebf6c3525a7ea2186e636df064ea47281987 , < 448e76cbdc6652ccd3ba337b7a6e1f028859f2ed (git)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 6.18.59 , ≤ 6.18.* (semver) Unaffected: 7.2.13 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/xe/xe_bo.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6046bb9cb2859e3d9bf939e4d6527f3827e1096f",
              "status": "affected",
              "version": "dd08ebf6c3525a7ea2186e636df064ea47281987",
              "versionType": "git"
            },
            {
              "lessThan": "b6499d19ade1f1e4a1e6b739abc8c815297c98b8",
              "status": "affected",
              "version": "dd08ebf6c3525a7ea2186e636df064ea47281987",
              "versionType": "git"
            },
            {
              "lessThan": "448e76cbdc6652ccd3ba337b7a6e1f028859f2ed",
              "status": "affected",
              "version": "dd08ebf6c3525a7ea2186e636df064ea47281987",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/xe/xe_bo.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.59",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.59",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.13",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: skip eviction of a BO with no resource\n\nxe_evict_flags() switches on tbo-\u003eresource-\u003emem_type to choose an\neviction placement. An xe BO can reach eviction with no ttm.resource,\ne.g. an imported dma-buf BO whose resource was freed during teardown\nwhile its attachment is still live: the exporter then invalidates it via\nxe_dma_buf_move_notify() -\u003e xe_bo_evict(), and the switch dereferences a\nNULL resource and faults.\n\nA BO with no resource has nothing placed or mapped, so there is nothing\nto evict. Return an empty placement (num_placement = 0), mirroring the\nhandling already used for non-xe scatter-gather BOs just above;\nttm_bo_validate() then takes the pipeline-gutting path and returns 0.\n\nWithout the fix the xe_dma_buf@xe_test_dmabuf_move_notify_no_resource\ndynamic live selftest will fail with below stack.\n\nBUG: kernel NULL pointer dereference, address: 0000000000000010\nRIP: 0010:xe_evict_flags+0xf4/0x140 [xe]\nCall Trace:\n \u003cTASK\u003e\n xe_bo_evict+0x40/0xa0 [xe]\n ? ttm_bo_pipeline_gutting+0x71/0x180 [ttm]\n xe_test_dmabuf_move_notify_no_resource+0x182/0x440 [xe]\n xe_dma_buf_kunit+0x387/0x580 [xe]\n\nv2: Add Fixes tag and failure info in commit text (Matt Brost)\n\n(cherry picked from commit dbcfaac6331f1fcb0c2fe3ad3e9adb1e5d43ec0c)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-28T10:36:03.274Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/448e76cbdc6652ccd3ba337b7a6e1f028859f2ed"
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      ],
      "title": "drm/xe: skip eviction of a BO with no resource",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "cveId": "CVE-2026-99209",
    "datePublished": "2026-10-28T10:36:03.274Z",
    "dateReserved": "2026-09-25T10:25:14.401Z",
    "dateUpdated": "2026-10-28T10:36:03.274Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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