drm/xe: Guard page-fault worker with runtime PM check

{
  "id": "16135cedaa0bb460a7e47b9636f0a3663144ac48ded0b3946d9dc7c9f5afccdc",
  "url": "https://osv.dev/vulnerability/CVE-2026-98391",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/xe: Guard page-fault worker with runtime PM check",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/xe: Guard page-fault worker with runtime PM check During VM teardown, the VM's runtime PM reference is dropped asynchronously, allowing the device to autosuspend while stale page faults belonging to the now-dead VM are still queued. When the page-fault worker later tries to ack one of these, it calls into guc_ct_send_locked() on an already-suspended device, tripping: Assertion `!xe_pm_runtime_suspended(xe)` failed! WARNING at xe_device.c:1267 xe_device_assert_mem_access+0x11c/0x140 [xe] A live VM/exec queue always holds a PM reference while it has outstanding work, so if the device is suspended at ack time, the owning context is already gone and the fault is stale. Take a runtime PM reference across the entire pagefault queue worker to safely deliver acks for torn-down VMs. v3: - Move PM ref to the generic xe_pagefault_queue_work using guard(xe_pm_runtime)(xe) instead of tracking it in the GuC backend(Matt Brost). v2: - Hold PM ref across the entire batch (begin/end) instead of per-ack. This prevents the device from autosuspending mid-batch, which would leave write_only acks written but the end flush skipped, and skip counter++, desyncing the cadence check.(Himal) - Add a comment explaining stale faults.(Himal) (cherry picked from commit fcc2431d2213dc4d04250c4f1ae87d9c3ae0d455) [Rodrigo: Added xe_device struct for compatibility while cherry-picking]",
    "evidence": "osv:CVE-2026-98391",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98391",
      "aliases": [
        "CVE-2026-98391"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f289f7807119128d4f9d59f34ac557549c7562e5"
                },
                {
                  "fixed": "25764620ec64c0142e2c87c41787f45540cf09ff"
                },
                {
                  "fixed": "20fce5b34b21a995839743b4917a1edd2fd503ba"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98391.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98391.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.737490429Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/20fce5b34b21a995839743b4917a1edd2fd503ba",
        "https://git.kernel.org/stable/c/25764620ec64c0142e2c87c41787f45540cf09ff",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98391.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98391",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98391.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98391",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 518152,
  "published_at": "2026-10-14T13:25:55.498+00:00"
}