CVE-2025-38581

Estado: AnalizadaMedia (5.5)—

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

crypto: ccp - Fix crash when rebind ccp device for ccp.ko

When CONFIG_CRYPTO_DEV_CCP_DEBUGFS is enabled, rebinding the ccp device causes the following crash:

$ echo '0000:0a:00.2' > /sys/bus/pci/drivers/ccp/unbind $ echo '0000:0a:00.2' > /sys/bus/pci/drivers/ccp/bind

This patch sets ccp_debugfs_dir to NULL after destroying it in ccp5_debugfs_destroy, allowing the directory dentry to be recreated when rebinding the ccp device.

Tested on AMD Ryzen 7 1700X.

Detalles técnicos trazas, registros y código del informe original

[  204.976930] BUG: kernel NULL pointer dereference, address: 0000000000000098
[  204.978026] #PF: supervisor write access in kernel mode
[  204.979126] #PF: error_code(0x0002) - not-present page
[  204.980226] PGD 0 P4D 0
[  204.981317] Oops: Oops: 0002 [#1] SMP NOPTI
...
[  204.997852] Call Trace:
[  204.999074]  <TASK>
[  205.000297]  start_creating+0x9f/0x1c0
[  205.001533]  debugfs_create_dir+0x1f/0x170
[  205.002769]  ? srso_return_thunk+0x5/0x5f
[  205.004000]  ccp5_debugfs_setup+0x87/0x170 [ccp]
[  205.005241]  ccp5_init+0x8b2/0x960 [ccp]
[  205.006469]  ccp_dev_init+0xd4/0x150 [ccp]
[  205.007709]  sp_init+0x5f/0x80 [ccp]
[  205.008942]  sp_pci_probe+0x283/0x2e0 [ccp]
[  205.010165]  ? srso_return_thunk+0x5/0x5f
[  205.011376]  local_pci_probe+0x4f/0xb0
[  205.012584]  pci_device_probe+0xdb/0x230
[  205.013810]  really_probe+0xed/0x380
[  205.015024]  __driver_probe_device+0x7e/0x160
[  205.016240]  device_driver_attach+0x2f/0x60
[  205.017457]  bind_store+0x7c/0xb0
[  205.018663]  drv_attr_store+0x28/0x40
[  205.019868]  sysfs_kf_write+0x5f/0x70
[  205.021065]  kernfs_fop_write_iter+0x145/0x1d0
[  205.022267]  vfs_write+0x308/0x440
[  205.023453]  ksys_write+0x6d/0xe0
[  205.024616]  __x64_sys_write+0x1e/0x30
[  205.025778]  x64_sys_call+0x16ba/0x2150
[  205.026942]  do_syscall_64+0x56/0x1e0
[  205.028108]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
[  205.029276] RIP: 0033:0x7fbc36f10104
[  205.030420] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8d 05 e1 08 2e 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 f3 c3 66 90 41 54 55 49 89 d4 53 48 89 f5

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.18%
Percentil entre todas las CVEs puntuadas: 6
Fecha de la puntuación: 6/10/2026

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).

Tecnologías afectadas (2)

Debian — Debian Linux Linux — Linux Kernel

CWE

CWE-476

Referencias

JSON original (NVD)

Mostrar

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  "id": "CVE-2025-38581",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Fix crash when rebind ccp device for ccp.ko\n\nWhen CONFIG_CRYPTO_DEV_CCP_DEBUGFS is enabled, rebinding\nthe ccp device causes the following crash:\n\n$ echo '0000:0a:00.2' > /sys/bus/pci/drivers/ccp/unbind\n$ echo '0000:0a:00.2' > /sys/bus/pci/drivers/ccp/bind\n\n[  204.976930] BUG: kernel NULL pointer dereference, address: 0000000000000098\n[  204.978026] #PF: supervisor write access in kernel mode\n[  204.979126] #PF: error_code(0x0002) - not-present page\n[  204.980226] PGD 0 P4D 0\n[  204.981317] Oops: Oops: 0002 [#1] SMP NOPTI\n...\n[  204.997852] Call Trace:\n[  204.999074]  <TASK>\n[  205.000297]  start_creating+0x9f/0x1c0\n[  205.001533]  debugfs_create_dir+0x1f/0x170\n[  205.002769]  ? srso_return_thunk+0x5/0x5f\n[  205.004000]  ccp5_debugfs_setup+0x87/0x170 [ccp]\n[  205.005241]  ccp5_init+0x8b2/0x960 [ccp]\n[  205.006469]  ccp_dev_init+0xd4/0x150 [ccp]\n[  205.007709]  sp_init+0x5f/0x80 [ccp]\n[  205.008942]  sp_pci_probe+0x283/0x2e0 [ccp]\n[  205.010165]  ? srso_return_thunk+0x5/0x5f\n[  205.011376]  local_pci_probe+0x4f/0xb0\n[  205.012584]  pci_device_probe+0xdb/0x230\n[  205.013810]  really_probe+0xed/0x380\n[  205.015024]  __driver_probe_device+0x7e/0x160\n[  205.016240]  device_driver_attach+0x2f/0x60\n[  205.017457]  bind_store+0x7c/0xb0\n[  205.018663]  drv_attr_store+0x28/0x40\n[  205.019868]  sysfs_kf_write+0x5f/0x70\n[  205.021065]  kernfs_fop_write_iter+0x145/0x1d0\n[  205.022267]  vfs_write+0x308/0x440\n[  205.023453]  ksys_write+0x6d/0xe0\n[  205.024616]  __x64_sys_write+0x1e/0x30\n[  205.025778]  x64_sys_call+0x16ba/0x2150\n[  205.026942]  do_syscall_64+0x56/0x1e0\n[  205.028108]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[  205.029276] RIP: 0033:0x7fbc36f10104\n[  205.030420] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8d 05 e1 08 2e 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 f3 c3 66 90 41 54 55 49 89 d4 53 48 89 f5\n\nThis patch sets ccp_debugfs_dir to NULL after destroying it in\nccp5_debugfs_destroy, allowing the directory dentry to be\nrecreated when rebinding the ccp device.\n\nTested on AMD Ryzen 7 1700X."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: crypto: ccp - Se corrige el fallo al revincular el dispositivo ccp para ccp.ko Cuando CONFIG_CRYPTO_DEV_CCP_DEBUGFS está habilitado, revincular el dispositivo ccp provoca el siguiente fallo: $ echo '0000:0a:00.2' &gt; /sys/bus/pci/drivers/ccp/unbind $ echo '0000:0a:00.2' &gt; /sys/bus/pci/drivers/ccp/bind [ 204.976930] ERROR: desreferencia de puntero NULL del kernel, dirección: 0000000000000098 [ 204.978026] #PF: acceso de escritura del supervisor en modo kernel [ 204.979126] #PF: error_code(0x0002) - página no presente [ 204.980226] PGD 0 P4D 0 [ 204.981317] Ups: Ups: 0002 [#1] SMP NOPTI ... [ 204.997852] Seguimiento de llamadas: [ 204.999074]  [ 205.000297] start_creating+0x9f/0x1c0 [ 205.001533] debugfs_create_dir+0x1f/0x170 [ 205.002769] ? srso_return_thunk+0x5/0x5f [ 205.004000] ccp5_debugfs_setup+0x87/0x170 [ccp] [ 205.005241] ccp5_init+0x8b2/0x960 [ccp] [ 205.006469] ccp_dev_init+0xd4/0x150 [ccp] [ 205.007709] sp_init+0x5f/0x80 [ccp] [ 205.008942] sp_pci_probe+0x283/0x2e0 [ccp] [ 205.010165] ? srso_return_thunk+0x5/0x5f [ 205.011376] local_pci_probe+0x4f/0xb0 [ 205.012584] pci_device_probe+0xdb/0x230 [ 205.013810] really_probe+0xed/0x380 [ 205.015024] __driver_probe_device+0x7e/0x160 [ 205.016240] device_driver_attach+0x2f/0x60 [ 205.017457] bind_store+0x7c/0xb0 [ 205.018663] drv_attr_store+0x28/0x40 [ 205.019868] sysfs_kf_write+0x5f/0x70 [ 205.021065] kernfs_fop_write_iter+0x145/0x1d0 [ 205.022267] vfs_write+0x308/0x440 [ 205.023453] ksys_write+0x6d/0xe0 [ 205.024616] __x64_sys_write+0x1e/0x30 [ 205.025778] x64_sys_call+0x16ba/0x2150 [ 205.026942] do_syscall_64+0x56/0x1e0 [ 205.028108] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 205.029276] RIP: 0033:0x7fbc36f10104 [ 205.030420] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8d 05 e1 08 2e 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 &lt;48&gt; 3d 00 f0 ff ff 77 54 f3 c3 66 90 41 54 55 49 89 d4 53 48 89 f5  Este parche establece ccp_debugfs_dir como NULL tras destruirlo en ccp5_debugfs_destroy, lo que permite recrear la entrada del directorio al reenlazar el dispositivo ccp. Probado en AMD Ryzen 7 1700X."
    }
  ],
  "lastModified": "2026-06-17T09:17:09.373",
  "configurations": [
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}