{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64438",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-64438"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "crypto: qat - fix VF2PF work teardown race in adf_disable_sriov()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: qat - fix VF2PF work teardown race in adf_disable_sriov()\n\nThe VF2PF interrupt handler queues PF-side response work that stores a\nraw pointer to per-VF state (struct adf_accel_vf_info). Currently,\nadf_disable_sriov() destroys per-VF mutexes and frees vf_info without\nstopping new VF2PF work or waiting for in-flight workers to complete. A\nconcurrently scheduled or already queued worker can then dereference\nfreed memory.\n\nThis manifests as a use-after-free when KASAN is enabled:\n\n  BUG: KASAN: null-ptr-deref in mutex_lock+0x76/0xe0\n  Write of size 8 at addr 0000000000000260 by task kworker/24:2/...\n  Workqueue: qat_pf2vf_resp_wq adf_iov_send_resp [intel_qat]\n  Call Trace:\n    kasan_report+0x119/0x140\n    mutex_lock+0x76/0xe0\n    adf_gen4_pfvf_send+0xd4/0x1f0 [intel_qat]\n    adf_recv_and_handle_vf2pf_msg+0x290/0x360 [intel_qat]\n    adf_iov_send_resp+0x8c/0xe0 [intel_qat]\n    process_one_work+0x6ac/0xfd0\n    worker_thread+0x4dd/0xd30\n    kthread+0x326/0x410\n    ret_from_fork+0x33b/0x670\n\nAdd a PF-local flag, vf2pf_disabled, that gates work queueing, worker\nprocessing, and interrupt re-enabling during teardown. Set this flag\natomically with the hardware interrupt mask inside\nadf_disable_all_vf2pf_interrupts(). After masking, synchronize the AE\ncluster MSI-X interrupt and flush the PF response workqueue before\ntearing down per-VF locks and state so all in-flight work completes\nbefore vf_info is destroyed.\n\nIntroduce adf_enable_all_vf2pf_interrupts() to clear the flag and\nunmask all VF2PF interrupts under the same lock when SR-IOV is\nre-enabled. This ensures the software flag and hardware state transition\natomically on both the enable and disable paths.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.178",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64438"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/218c2836b3987f3fa1d9eac505462cded0821e4c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/446b4d77599cf1a168573f7fb32a4a6aa4f09219"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5d916c1eae1933511a69bffe243b4ee5d7da399c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f344a369d0380d54c8d6c8d24734a78dd5a89817"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/51144032248cc4ea22917370565650670b8b4e9b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/49cd5ac6de8de39a14ead609bb552d372d5602cd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6e92b28cd74fa433658efeadf21b9d4b01023d7d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/277281c10c63791067d24d421f7c43a15faa9096"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z"
  }
}