{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ed8ccaef52fa03fb03cff45b380f72c9f869f273"
            },
            {
              "fixed": "218c2836b3987f3fa1d9eac505462cded0821e4c"
            },
            {
              "fixed": "446b4d77599cf1a168573f7fb32a4a6aa4f09219"
            },
            {
              "fixed": "5d916c1eae1933511a69bffe243b4ee5d7da399c"
            },
            {
              "fixed": "f344a369d0380d54c8d6c8d24734a78dd5a89817"
            },
            {
              "fixed": "51144032248cc4ea22917370565650670b8b4e9b"
            },
            {
              "fixed": "49cd5ac6de8de39a14ead609bb552d372d5602cd"
            },
            {
              "fixed": "6e92b28cd74fa433658efeadf21b9d4b01023d7d"
            },
            {
              "fixed": "277281c10c63791067d24d421f7c43a15faa9096"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.3.0"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64438.json"
  },
  "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.",
  "id": "CVE-2026-64438",
  "modified": "2026-07-28T03:56:01.530899196Z",
  "published": "2026-07-25T08:51:11.740Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/218c2836b3987f3fa1d9eac505462cded0821e4c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/277281c10c63791067d24d421f7c43a15faa9096"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/446b4d77599cf1a168573f7fb32a4a6aa4f09219"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/49cd5ac6de8de39a14ead609bb552d372d5602cd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/51144032248cc4ea22917370565650670b8b4e9b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d916c1eae1933511a69bffe243b4ee5d7da399c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e92b28cd74fa433658efeadf21b9d4b01023d7d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f344a369d0380d54c8d6c8d24734a78dd5a89817"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64438.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64438"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "crypto: qat - fix VF2PF work teardown race in adf_disable_sriov()"
}