crypto: qat - fix VF2PF work teardown race in adf_disable_sriov()

{
  "id": "5ff5bb75e840902a72b27ed2a0929ea29a5445f01c7dd44260a08635889f7df5",
  "url": "https://osv.dev/vulnerability/CVE-2026-64438",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "crypto: qat - fix VF2PF work teardown race in adf_disable_sriov()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: crypto: qat - fix VF2PF work teardown race in adf_disable_sriov() The VF2PF interrupt handler queues PF-side response work that stores a raw pointer to per-VF state (struct adf_accel_vf_info). Currently, adf_disable_sriov() destroys per-VF mutexes and frees vf_info without stopping new VF2PF work or waiting for in-flight workers to complete. A concurrently scheduled or already queued worker can then dereference freed memory. This manifests as a use-after-free when KASAN is enabled: BUG: KASAN: null-ptr-deref in mutex_lock+0x76/0xe0 Write of size 8 at addr 0000000000000260 by task kworker/24:2/... Workqueue: qat_pf2vf_resp_wq adf_iov_send_resp [intel_qat] Call Trace: kasan_report+0x119/0x140 mutex_lock+0x76/0xe0 adf_gen4_pfvf_send+0xd4/0x1f0 [intel_qat] adf_recv_and_handle_vf2pf_msg+0x290/0x360 [intel_qat] adf_iov_send_resp+0x8c/0xe0 [intel_qat] process_one_work+0x6ac/0xfd0 worker_thread+0x4dd/0xd30 kthread+0x326/0x410 ret_from_fork+0x33b/0x670 Add a PF-local flag, vf2pf_disabled, that gates work queueing, worker processing, and interrupt re-enabling during teardown. Set this flag atomically with the hardware interrupt mask inside adf_disable_all_vf2pf_interrupts(). After masking, synchronize the AE cluster MSI-X interrupt and flush the PF response workqueue before tearing down per-VF locks and state so all in-flight work completes before vf_info is destroyed. Introduce adf_enable_all_vf2pf_interrupts() to cle",
    "evidence": "osv:CVE-2026-64438",
    "products": [
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    "severity": "high",
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      "aliases": [
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
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      "modified": "2026-10-28T02:30:36.738859306Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/218c2836b3987f3fa1d9eac505462cded0821e4c",
        "https://git.kernel.org/stable/c/277281c10c63791067d24d421f7c43a15faa9096",
        "https://git.kernel.org/stable/c/446b4d77599cf1a168573f7fb32a4a6aa4f09219",
        "https://git.kernel.org/stable/c/49cd5ac6de8de39a14ead609bb552d372d5602cd",
        "https://git.kernel.org/stable/c/51144032248cc4ea22917370565650670b8b4e9b",
        "https://git.kernel.org/stable/c/5d916c1eae1933511a69bffe243b4ee5d7da399c",
        "https://git.kernel.org/stable/c/6e92b28cd74fa433658efeadf21b9d4b01023d7d",
        "https://git.kernel.org/stable/c/f344a369d0380d54c8d6c8d24734a78dd5a89817",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64438.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64438",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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        "cna_assigner": "Linux",
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 504003,
  "published_at": "2026-07-25T08:51:11.74+00:00"
}