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CVE-2025-21672

Estado: ModificadaMedia (5.5)—

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

afs: Fix merge preference rule failure condition

syzbot reported a lock held when returning to userspace[1]. This is because if argc is less than 0 and the function returns directly, the held inode lock is not released.

Fix this by store the error in ret and jump to done to clean up instead of returning directly.

[dh: Modified Lizhi Xu's original patch to make it honour the error code from afs_split_string()]

[1] WARNING: lock held when returning to user space! 6.13.0-rc3-syzkaller-00209-g499551201b5f #0 Not tainted ------------------------------------------------ syz-executor133/5823 is leaving the kernel with locks still held! 1 lock held by syz-executor133/5823: #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline] #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: afs_proc_addr_prefs_write+0x2bb/0x14e0 fs/afs/addr_prefs.c:388

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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "options": [
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              "automatable": "no"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2025-10-01T19:52:11.531644Z"
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix merge preference rule failure condition\n\nsyzbot reported a lock held when returning to userspace[1].  This is\nbecause if argc is less than 0 and the function returns directly, the held\ninode lock is not released.\n\nFix this by store the error in ret and jump to done to clean up instead of\nreturning directly.\n\n[dh: Modified Lizhi Xu's original patch to make it honour the error code\nfrom afs_split_string()]\n\n[1]\nWARNING: lock held when returning to user space!\n6.13.0-rc3-syzkaller-00209-g499551201b5f #0 Not tainted\n------------------------------------------------\nsyz-executor133/5823 is leaving the kernel with locks still held!\n1 lock held by syz-executor133/5823:\n #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline]\n #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: afs_proc_addr_prefs_write+0x2bb/0x14e0 fs/afs/addr_prefs.c:388"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: afs: Se corrige la condición de error de la regla de preferencia de fusión. syzbot informó de un bloqueo retenido al volver al espacio de usuario[1]. Esto se debe a que si argc es menor que 0 y la función retorna directamente, el bloqueo del inodo retenido no se libera. Corrija esto almacenando el error en ret y saltando a done para limpiar en lugar de regresar directamente. [dh: Se modificó el parche original de Lizhi Xu para que respete el código de error de afs_split_string()] [1] ADVERTENCIA: ¡bloqueo retenido al volver al espacio de usuario! 6.13.0-rc3-syzkaller-00209-g499551201b5f #0 No contaminado ------------------------------------------------ ¡syz-executor133/5823 está abandonando el kernel con bloqueos aún retenidos! 1 bloqueo mantenido por syz-executor133/5823: #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, en: inode_lock include/linux/fs.h:818 [en línea] #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, en: afs_proc_addr_prefs_write+0x2bb/0x14e0 fs/afs/addr_prefs.c:388"
    }
  ],
  "lastModified": "2026-06-17T08:43:59.103",
  "configurations": [
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