CVE-2022-49626

Estado: AnalizadaAlta (7.8)—

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

sfc: fix use after free when disabling sriov

Use after free is detected by kfence when disabling sriov. What was read after being freed was vf->pci_dev: it was freed from pci_disable_sriov and later read in efx_ef10_sriov_free_vf_vports, called from efx_ef10_sriov_free_vf_vswitching.

Set the pointer to NULL at release time to not trying to read it later.

Reproducer and dmesg log (note that kfence doesn't detect it every time): $ echo 1 > /sys/class/net/enp65s0f0np0/device/sriov_numvfs $ echo 0 > /sys/class/net/enp65s0f0np0/device/sriov_numvfs

Leer descripción completaMostrar menos

kfence-#224: 0x00000000edb8ef95-0x00000000671f5ce1, size=2792, cache=kmalloc-4k

Detalles técnicos trazas, registros y código del informe original

 BUG: KFENCE: use-after-free read in efx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc]

 Use-after-free read at 0x00000000ff3c1ba5 (in kfence-#224):
  efx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc]
  efx_ef10_pci_sriov_disable+0x38/0x70 [sfc]
  efx_pci_sriov_configure+0x24/0x40 [sfc]
  sriov_numvfs_store+0xfe/0x140
  kernfs_fop_write_iter+0x11c/0x1b0
  new_sync_write+0x11f/0x1b0
  vfs_write+0x1eb/0x280
  ksys_write+0x5f/0xe0
  do_syscall_64+0x5c/0x80
  entry_SYSCALL_64_after_hwframe+0x44/0xae

 allocated by task 6771 on cpu 10 at 3137.860196s:
  pci_alloc_dev+0x21/0x60
  pci_iov_add_virtfn+0x2a2/0x320
  sriov_enable+0x212/0x3e0
  efx_ef10_sriov_configure+0x67/0x80 [sfc]
  efx_pci_sriov_configure+0x24/0x40 [sfc]
  sriov_numvfs_store+0xba/0x140
  kernfs_fop_write_iter+0x11c/0x1b0
  new_sync_write+0x11f/0x1b0
  vfs_write+0x1eb/0x280
  ksys_write+0x5f/0xe0
  do_syscall_64+0x5c/0x80
  entry_SYSCALL_64_after_hwframe+0x44/0xae

 freed by task 6771 on cpu 12 at 3170.991309s:
  device_release+0x34/0x90
  kobject_cleanup+0x3a/0x130
  pci_iov_remove_virtfn+0xd9/0x120
  sriov_disable+0x30/0xe0
  efx_ef10_pci_sriov_disable+0x57/0x70 [sfc]
  efx_pci_sriov_configure+0x24/0x40 [sfc]
  sriov_numvfs_store+0xfe/0x140
  kernfs_fop_write_iter+0x11c/0x1b0
  new_sync_write+0x11f/0x1b0
  vfs_write+0x1eb/0x280
  ksys_write+0x5f/0xe0
  do_syscall_64+0x5c/0x80
  entry_SYSCALL_64_after_hwframe+0x44/0xae

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.28%
Percentil entre todas las CVEs puntuadas: 18
Fecha de la puntuación: 5/10/2026

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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution70 %

Vulnerabilidad local (AV:L, PR:L) que permite escritura/lectura de memoria a través de use-after-free, escalando privilegios o ejecutando código en contexto del 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 Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416

Referencias

JSON original (NVD)

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsfc: fix use after free when disabling sriov\n\nUse after free is detected by kfence when disabling sriov. What was read\nafter being freed was vf->pci_dev: it was freed from pci_disable_sriov\nand later read in efx_ef10_sriov_free_vf_vports, called from\nefx_ef10_sriov_free_vf_vswitching.\n\nSet the pointer to NULL at release time to not trying to read it later.\n\nReproducer and dmesg log (note that kfence doesn't detect it every time):\n$ echo 1 > /sys/class/net/enp65s0f0np0/device/sriov_numvfs\n$ echo 0 > /sys/class/net/enp65s0f0np0/device/sriov_numvfs\n\n BUG: KFENCE: use-after-free read in efx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc]\n\n Use-after-free read at 0x00000000ff3c1ba5 (in kfence-#224):\n  efx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc]\n  efx_ef10_pci_sriov_disable+0x38/0x70 [sfc]\n  efx_pci_sriov_configure+0x24/0x40 [sfc]\n  sriov_numvfs_store+0xfe/0x140\n  kernfs_fop_write_iter+0x11c/0x1b0\n  new_sync_write+0x11f/0x1b0\n  vfs_write+0x1eb/0x280\n  ksys_write+0x5f/0xe0\n  do_syscall_64+0x5c/0x80\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n kfence-#224: 0x00000000edb8ef95-0x00000000671f5ce1, size=2792, cache=kmalloc-4k\n\n allocated by task 6771 on cpu 10 at 3137.860196s:\n  pci_alloc_dev+0x21/0x60\n  pci_iov_add_virtfn+0x2a2/0x320\n  sriov_enable+0x212/0x3e0\n  efx_ef10_sriov_configure+0x67/0x80 [sfc]\n  efx_pci_sriov_configure+0x24/0x40 [sfc]\n  sriov_numvfs_store+0xba/0x140\n  kernfs_fop_write_iter+0x11c/0x1b0\n  new_sync_write+0x11f/0x1b0\n  vfs_write+0x1eb/0x280\n  ksys_write+0x5f/0xe0\n  do_syscall_64+0x5c/0x80\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n freed by task 6771 on cpu 12 at 3170.991309s:\n  device_release+0x34/0x90\n  kobject_cleanup+0x3a/0x130\n  pci_iov_remove_virtfn+0xd9/0x120\n  sriov_disable+0x30/0xe0\n  efx_ef10_pci_sriov_disable+0x57/0x70 [sfc]\n  efx_pci_sriov_configure+0x24/0x40 [sfc]\n  sriov_numvfs_store+0xfe/0x140\n  kernfs_fop_write_iter+0x11c/0x1b0\n  new_sync_write+0x11f/0x1b0\n  vfs_write+0x1eb/0x280\n  ksys_write+0x5f/0xe0\n  do_syscall_64+0x5c/0x80\n  entry_SYSCALL_64_after_hwframe+0x44/0xae"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sfc: se corrige el use-after-free al deshabilitar sriov. El use-after-free es detectado por kfence al deshabilitar sriov. Lo que se leyó después de ser liberado fue vf-&gt;pci_dev: se liberó de pci_disable_sriov y luego se leyó en efx_ef10_sriov_free_vf_vports, llamado desde efx_ef10_sriov_free_vf_vswitching. Establezca el puntero en NULL en el momento de la liberación para no intentar leerlo más tarde. Registro del reproductor y dmesg (tenga en cuenta que kfence no lo detecta cada vez): $ echo 1 &gt; /sys/class/net/enp65s0f0np0/device/sriov_numvfs $ echo 0 &gt; /sys/class/net/enp65s0f0np0/device/sriov_numvfs BUG: KFENCE: use-after-free read in efx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc] Use-after-free read at 0x00000000ff3c1ba5 (in kfence-#224): efx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc] efx_ef10_pci_sriov_disable+0x38/0x70 [sfc] efx_pci_sriov_configure+0x24/0x40 [sfc] sriov_numvfs_store+0xfe/0x140 kernfs_fop_write_iter+0x11c/0x1b0 new_sync_write+0x11f/0x1b0 vfs_write+0x1eb/0x280 ksys_write+0x5f/0xe0 do_syscall_64+0x5c/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae kfence-#224: 0x00000000edb8ef95-0x00000000671f5ce1, size=2792, cache=kmalloc-4k allocated by task 6771 on cpu 10 at 3137.860196s: pci_alloc_dev+0x21/0x60 pci_iov_add_virtfn+0x2a2/0x320 sriov_enable+0x212/0x3e0 efx_ef10_sriov_configure+0x67/0x80 [sfc] efx_pci_sriov_configure+0x24/0x40 [sfc] sriov_numvfs_store+0xba/0x140 kernfs_fop_write_iter+0x11c/0x1b0 new_sync_write+0x11f/0x1b0 vfs_write+0x1eb/0x280 ksys_write+0x5f/0xe0 do_syscall_64+0x5c/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae freed by task 6771 on cpu 12 at 3170.991309s: device_release+0x34/0x90 kobject_cleanup+0x3a/0x130 pci_iov_remove_virtfn+0xd9/0x120 sriov_disable+0x30/0xe0 efx_ef10_pci_sriov_disable+0x57/0x70 [sfc] efx_pci_sriov_configure+0x24/0x40 [sfc] sriov_numvfs_store+0xfe/0x140 kernfs_fop_write_iter+0x11c/0x1b0 new_sync_write+0x11f/0x1b0 vfs_write+0x1eb/0x280 ksys_write+0x5f/0xe0 do_syscall_64+0x5c/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae "
    }
  ],
  "lastModified": "2026-06-17T05:18:40.050",
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}