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CVE-2022-50064

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

virtio-blk: Avoid use-after-free on suspend/resume

hctx->user_data is set to vq in virtblk_init_hctx(). However, vq is freed on suspend and reallocated on resume. So, hctx->user_data is invalid after resume, and it will cause use-after-free accessing which will result in the kernel crash something like below:

This patch fixes this issue by getting vq from vblk, and removes virtblk_init_hctx().

Detalles técnicos trazas, registros y código del informe original
[   22.428391] Call Trace:
[   22.428899]  <TASK>
[   22.429339]  virtqueue_add_split+0x3eb/0x620
[   22.430035]  ? __blk_mq_alloc_requests+0x17f/0x2d0
[   22.430789]  ? kvm_clock_get_cycles+0x14/0x30
[   22.431496]  virtqueue_add_sgs+0xad/0xd0
[   22.432108]  virtblk_add_req+0xe8/0x150
[   22.432692]  virtio_queue_rqs+0xeb/0x210
[   22.433330]  blk_mq_flush_plug_list+0x1b8/0x280
[   22.434059]  __blk_flush_plug+0xe1/0x140
[   22.434853]  blk_finish_plug+0x20/0x40
[   22.435512]  read_pages+0x20a/0x2e0
[   22.436063]  ? folio_add_lru+0x62/0xa0
[   22.436652]  page_cache_ra_unbounded+0x112/0x160
[   22.437365]  filemap_get_pages+0xe1/0x5b0
[   22.437964]  ? context_to_sid+0x70/0x100
[   22.438580]  ? sidtab_context_to_sid+0x32/0x400
[   22.439979]  filemap_read+0xcd/0x3d0
[   22.440917]  xfs_file_buffered_read+0x4a/0xc0
[   22.441984]  xfs_file_read_iter+0x65/0xd0
[   22.442970]  __kernel_read+0x160/0x2e0
[   22.443921]  bprm_execve+0x21b/0x640
[   22.444809]  do_execveat_common.isra.0+0x1a8/0x220
[   22.446008]  __x64_sys_execve+0x2d/0x40
[   22.446920]  do_syscall_64+0x37/0x90
[   22.447773]  entry_SYSCALL_64_after_hwframe+0x63/0xcd

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad local (AV:L, PR:L) de use-after-free (CWE-416) que causa crash del kernel tras suspend/resume; explotable por usuario local sin interacción para DoS o ejecución de código kernel.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2022-50064",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4e0400525691d0e676dbe002641f9a61261f1e1b",
              "lessThan": "2b54e14535bc34bf649372060d518ec9f2b893b3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4e0400525691d0e676dbe002641f9a61261f1e1b",
              "lessThan": "8d12ec10292877751ee4463b11a63bd850bc09b5",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/block/virtio_blk.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.19.4",
              "versionType": "semver",
              "lessThanOrEqual": "5.19.*"
            },
            {
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/block/virtio_blk.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-06-18T11:15:35.157",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2b54e14535bc34bf649372060d518ec9f2b893b3",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8d12ec10292877751ee4463b11a63bd850bc09b5",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-blk: Avoid use-after-free on suspend/resume\n\nhctx->user_data is set to vq in virtblk_init_hctx().  However, vq is\nfreed on suspend and reallocated on resume.  So, hctx->user_data is\ninvalid after resume, and it will cause use-after-free accessing which\nwill result in the kernel crash something like below:\n\n[   22.428391] Call Trace:\n[   22.428899]  <TASK>\n[   22.429339]  virtqueue_add_split+0x3eb/0x620\n[   22.430035]  ? __blk_mq_alloc_requests+0x17f/0x2d0\n[   22.430789]  ? kvm_clock_get_cycles+0x14/0x30\n[   22.431496]  virtqueue_add_sgs+0xad/0xd0\n[   22.432108]  virtblk_add_req+0xe8/0x150\n[   22.432692]  virtio_queue_rqs+0xeb/0x210\n[   22.433330]  blk_mq_flush_plug_list+0x1b8/0x280\n[   22.434059]  __blk_flush_plug+0xe1/0x140\n[   22.434853]  blk_finish_plug+0x20/0x40\n[   22.435512]  read_pages+0x20a/0x2e0\n[   22.436063]  ? folio_add_lru+0x62/0xa0\n[   22.436652]  page_cache_ra_unbounded+0x112/0x160\n[   22.437365]  filemap_get_pages+0xe1/0x5b0\n[   22.437964]  ? context_to_sid+0x70/0x100\n[   22.438580]  ? sidtab_context_to_sid+0x32/0x400\n[   22.439979]  filemap_read+0xcd/0x3d0\n[   22.440917]  xfs_file_buffered_read+0x4a/0xc0\n[   22.441984]  xfs_file_read_iter+0x65/0xd0\n[   22.442970]  __kernel_read+0x160/0x2e0\n[   22.443921]  bprm_execve+0x21b/0x640\n[   22.444809]  do_execveat_common.isra.0+0x1a8/0x220\n[   22.446008]  __x64_sys_execve+0x2d/0x40\n[   22.446920]  do_syscall_64+0x37/0x90\n[   22.447773]  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThis patch fixes this issue by getting vq from vblk, and removes\nvirtblk_init_hctx()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: virtio-blk: Evita el Use-After-Free al suspender/reanudar. hctx-&gt;user_data está configurado como vq en virtblk_init_hctx(). Sin embargo, vq se libera al suspender y se reasigna al reanudar. Por lo tanto, hctx-&gt;user_data no es válido después de reanudar y provocará el acceso después de la liberación, lo que provocará un fallo del kernel similar al siguiente: [ 22.428391] Seguimiento de llamadas: [ 22.428899]  [ 22.429339] virtqueue_add_split+0x3eb/0x620 [ 22.430035] ? __blk_mq_alloc_requests+0x17f/0x2d0 [ 22.430789] ? kvm_clock_get_cycles+0x14/0x30 [ 22.431496] virtqueue_add_sgs+0xad/0xd0 [ 22.432108] virtblk_add_req+0xe8/0x150 [ 22.432692] virtio_queue_rqs+0xeb/0x210 [ 22.433330] blk_mq_flush_plug_list+0x1b8/0x280 [ 22.434059] __blk_flush_plug+0xe1/0x140 [ 22.434853] blk_finish_plug+0x20/0x40 [ 22.435512] read_pages+0x20a/0x2e0 [ 22.436063] ? folio_add_lru+0x62/0xa0 [ 22.436652] page_cache_ra_unbounded+0x112/0x160 [ 22.437365] filemap_get_pages+0xe1/0x5b0 [ 22.437964] ? context_to_sid+0x70/0x100 [ 22.438580] ? sidtab_context_to_sid+0x32/0x400 [ 22.439979] filemap_read+0xcd/0x3d0 [ 22.440917] xfs_file_buffered_read+0x4a/0xc0 [ 22.441984] xfs_file_read_iter+0x65/0xd0 [ 22.442970] __kernel_read+0x160/0x2e0 [ 22.443921] bprm_execve+0x21b/0x640 [ 22.444809] do_execveat_common.isra.0+0x1a8/0x220 [ 22.446008] __x64_sys_execve+0x2d/0x40 [ 22.446920] do_syscall_64+0x37/0x90 [ 22.447773] entry_SYSCALL_64_after_hwframe+0x63/0xcd Este parche corrige este problema obteniendo vq de vblk y elimina virtblk_init_hctx()."
    }
  ],
  "lastModified": "2026-08-04T10:18:04.103",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6B05B3A7-DED2-4B21-94AE-AE1F779C2A3D",
              "versionEndExcluding": "5.19.4",
              "versionStartIncluding": "5.19"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}