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CVE-2026-64438

Full vulnerability record from the local CVENow database.

Description

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.

Severity
HIGH
CVSS score
8.8 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-07-25 10:17:28.303000
Last modified
2026-10-24 13:10:00.147000
View original CVE JSON 
{
  "id": "CVE-2026-64438",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-07-25T10:17:28.303",
  "lastModified": "2026-10-24T13:10:00.147",
  "vulnStatus": "Modified",
  "cveTags": [],
  "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: qat - corrección de la condición de carrera en la deshabilitación del trabajo VF2PF en adf_disable_sriov()\n\nEl gestor de interrupciones VF2PF encola trabajo de respuesta del lado del PF que almacena un puntero sin procesar al estado por VF (struct adf_accel_vf_info). Actualmente, adf_disable_sriov() destruye los mutexes por VF y libera vf_info sin detener nuevo trabajo VF2PF o esperar a que los trabajadores en curso se completen. Un trabajador programado concurrentemente o ya encolado puede entonces desreferenciar memoria liberada.\n\nEsto se manifiesta como un uso después de liberación cuando KASAN está habilitado:\n\n  ERROR: KASAN: null-ptr-deref en mutex_lock+0x76/0xe0\n  Escritura de tamaño 8 en la dirección 0000000000000260 por la tarea kworker/24:2/...\n  Cola de trabajo: qat_pf2vf_resp_wq adf_iov_send_resp [intel_qat]\n  Rastro de Llamada:\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\nSe añade un indicador local de PF, vf2pf_disabled, que controla el encolamiento de trabajo, el procesamiento de trabajadores y la re-habilitación de interrupciones durante la deshabilitación. Este indicador se establece atómicamente con la máscara de interrupción de hardware dentro de adf_disable_all_vf2pf_interrupts(). Después de enmascarar, se sincroniza la interrupción MSI-X del clúster AE y se vacía la cola de trabajo de respuesta del PF antes de deshabilitar los bloqueos y el estado por VF para que todo el trabajo en curso se complete antes de que vf_info sea destruido.\n\nSe introduce adf_enable_all_vf2pf_interrupts() para borrar el indicador y desenmascarar todas las interrupciones VF2PF bajo el mismo bloqueo cuando SR-IOV es re-habilitado. Esto asegura que el indicador de software y el estado del hardware transicionen atómicamente tanto en las rutas de habilitación como de deshabilitación."
    }
  ],
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            "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"
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            "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"
          ],
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              "version": "5.10.261",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
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              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
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          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
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          "availabilityImpact": "HIGH"
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          "role": "CISA Coordinator",
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  "weaknesses": [
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      "source": "[email protected]",
      "type": "Primary",
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