CVE-2026-64438 (GCVE-0-2026-64438)
Vulnerability from cvelistv5
Published
2026-07-25 08:51
Modified
2026-08-17 04:55
Severity ?
8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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 clear the flag and unmask all VF2PF interrupts under the same lock when SR-IOV is re-enabled. This ensures the software flag and hardware state transition atomically on both the enable and disable paths.
References
Impacted products
Vendor Product Version
Linux Linux Version: ed8ccaef52fa03fb03cff45b380f72c9f869f273
Version: ed8ccaef52fa03fb03cff45b380f72c9f869f273
Version: ed8ccaef52fa03fb03cff45b380f72c9f869f273
Version: ed8ccaef52fa03fb03cff45b380f72c9f869f273
Version: ed8ccaef52fa03fb03cff45b380f72c9f869f273
Version: ed8ccaef52fa03fb03cff45b380f72c9f869f273
Version: ed8ccaef52fa03fb03cff45b380f72c9f869f273
Version: ed8ccaef52fa03fb03cff45b380f72c9f869f273
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/crypto/intel/qat/qat_common/adf_accel_devices.h",
            "drivers/crypto/intel/qat/qat_common/adf_common_drv.h",
            "drivers/crypto/intel/qat/qat_common/adf_isr.c",
            "drivers/crypto/intel/qat/qat_common/adf_sriov.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/crypto/intel/qat/qat_common/adf_accel_devices.h",
            "drivers/crypto/intel/qat/qat_common/adf_common_drv.h",
            "drivers/crypto/intel/qat/qat_common/adf_isr.c",
            "drivers/crypto/intel/qat/qat_common/adf_sriov.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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            },
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              "version": "0",
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              "status": "unaffected",
              "version": "5.10.261",
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            },
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              "status": "unaffected",
              "version": "5.15.212",
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              "version": "6.1.178",
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              "version": "6.6.145",
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              "version": "6.12.97",
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              "status": "unaffected",
              "version": "6.18.40",
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              "version": "7.1.4",
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            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation originates from a local process or guest with direct access to an assigned QAT VF, using VF MMIO or the VF driver to generate VF2PF messages; it is not network-reachable.\nAC:L - The VF controls mailbox generation, restart-complete signaling, and acknowledgement behavior, and can keep response work active for up to one second while teardown proceeds. VF removal itself also emits shutdown traffic, making the race repeatedly attacker-alignable.\nPR:L - The attacker needs authorized access to an assigned QAT VF, which can be delegated through VFIO to an unprivileged process or tenant VM. No host administrative capability is required during management-initiated teardown or reset.\nUI:N - Exploitation requires no victim-user action; device teardown, hot-unplug, shutdown, or automatic error recovery supplies the concurrent lifecycle event.\nS:C - In a virtualized deployment, a tenant controlling an assigned VF corrupts memory in the host PF kernel, crossing the guest-to-host isolation boundary.\nC:H - The freed VF-state allocation contains kernel pointers and synchronization state, and reclamation of the stale object can support disclosure of arbitrary host-kernel memory.\nI:H - The worker performs writes through destroyed mutexes and stale pointers into freed or reallocated memory, providing memory-corruption primitives potentially usable for host-kernel code execution.\nA:H - The observed use-after-free produces invalid kernel writes and NULL-pointer dereferences, allowing a kernel oops or panic and complete host availability loss."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:55:39.854Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/218c2836b3987f3fa1d9eac505462cded0821e4c"
        },
        {
          "url": "https://git.kernel.org/stable/c/446b4d77599cf1a168573f7fb32a4a6aa4f09219"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d916c1eae1933511a69bffe243b4ee5d7da399c"
        },
        {
          "url": "https://git.kernel.org/stable/c/f344a369d0380d54c8d6c8d24734a78dd5a89817"
        },
        {
          "url": "https://git.kernel.org/stable/c/51144032248cc4ea22917370565650670b8b4e9b"
        },
        {
          "url": "https://git.kernel.org/stable/c/49cd5ac6de8de39a14ead609bb552d372d5602cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e92b28cd74fa433658efeadf21b9d4b01023d7d"
        },
        {
          "url": "https://git.kernel.org/stable/c/277281c10c63791067d24d421f7c43a15faa9096"
        }
      ],
      "title": "crypto: qat - fix VF2PF work teardown race in adf_disable_sriov()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64438",
    "datePublished": "2026-07-25T08:51:11.740Z",
    "dateReserved": "2026-07-19T15:36:31.788Z",
    "dateUpdated": "2026-08-17T04:55:39.854Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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