CVE-2022-49379
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
driver core: Fix wait_for_device_probe() & deferred_probe_timeout interaction
Mounting NFS rootfs was timing out when deferred_probe_timeout was non-zero [1]. This was because ip_auto_config() initcall times out waiting for the network interfaces to show up when deferred_probe_timeout was non-zero. While ip_auto_config() calls wait_for_device_probe() to make sure any currently running deferred probe work or asynchronous probe finishes, that wasn't sufficient to account for devices being deferred until deferred_probe_timeout.
Commit 35a672363ab3 ("driver core: Ensure wait_for_device_probe() waits until the deferred_probe_timeout fires") tried to fix that by making sure wait_for_device_probe() waits for deferred_probe_timeout to expire before returning.
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However, if wait_for_device_probe() is called from the kernel_init() context:
Neither of this is good. So revert the changes to wait_for_device_probe().
[1] - https://lore.kernel.org/lkml/TYAPR01MB45443DF63B9EF29054F7C41FD8C60@TYAPR01MB4544.jpnprd01.prod.outlook.com/ [2] - https://lore.kernel.org/lkml/YowHNo4sBjr9ijZr@dev-arch.thelio-3990X/ [3] - https://lore.kernel.org/lkml/Yo3WvGnNk3LvLb7R@linutronix.de/
Detalles técnicos trazas, registros y código del informe original
- Before deferred_probe_initcall() [2], it causes the boot process to hang due to a deadlock. - After deferred_probe_initcall() [3], it blocks kernel_init() from continuing till deferred_probe_timeout expires and beats the point of deferred_probe_timeout that's trying to wait for userspace to load modules.
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: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- 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 (1)
CWE
- CWE-667
Referencias
- https://git.kernel.org/stable/c/29357883a89193863f3cc6a2c5e0b42ceb022761
- https://git.kernel.org/stable/c/4ad6af07efcca85369c21e4897b3020cff2c170b
- https://git.kernel.org/stable/c/528229474e1cbb1b3451cb713d94aecb5f6ee264
- https://git.kernel.org/stable/c/5ee76c256e928455212ab759c51d198fedbe7523
- https://git.kernel.org/stable/c/71cbce75031aed26c72c2dc8a83111d181685f1b
JSON original (NVD)
Mostrar
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"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",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndriver core: Fix wait_for_device_probe() & deferred_probe_timeout interaction\n\nMounting NFS rootfs was timing out when deferred_probe_timeout was\nnon-zero [1]. This was because ip_auto_config() initcall times out\nwaiting for the network interfaces to show up when\ndeferred_probe_timeout was non-zero. While ip_auto_config() calls\nwait_for_device_probe() to make sure any currently running deferred\nprobe work or asynchronous probe finishes, that wasn't sufficient to\naccount for devices being deferred until deferred_probe_timeout.\n\nCommit 35a672363ab3 (\"driver core: Ensure wait_for_device_probe() waits\nuntil the deferred_probe_timeout fires\") tried to fix that by making\nsure wait_for_device_probe() waits for deferred_probe_timeout to expire\nbefore returning.\n\nHowever, if wait_for_device_probe() is called from the kernel_init()\ncontext:\n\n- Before deferred_probe_initcall() [2], it causes the boot process to\n hang due to a deadlock.\n\n- After deferred_probe_initcall() [3], it blocks kernel_init() from\n continuing till deferred_probe_timeout expires and beats the point of\n deferred_probe_timeout that's trying to wait for userspace to load\n modules.\n\nNeither of this is good. So revert the changes to\nwait_for_device_probe().\n\n[1] - https://lore.kernel.org/lkml/TYAPR01MB45443DF63B9EF29054F7C41FD8C60@TYAPR01MB4544.jpnprd01.prod.outlook.com/\n[2] - https://lore.kernel.org/lkml/YowHNo4sBjr9ijZr@dev-arch.thelio-3990X/\n[3] - https://lore.kernel.org/lkml/Yo3WvGnNk3LvLb7R@linutronix.de/"
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: núcleo del controlador: se corrige la interacción wait_for_device_probe() y deferred_probe_timeout El montaje de rootfs NFS se agotaba cuando deferred_probe_timeout no era cero [1]. Esto se debía a que la llamada de inicio ip_auto_config() agotaba el tiempo de espera a que aparecieran las interfaces de red cuando deferred_probe_timeout no era cero. Si bien ip_auto_config() llama a wait_for_device_probe() para asegurarse de que cualquier sonda diferida que se esté ejecutando actualmente funcione o la sonda asincrónica finalice, eso no era suficiente para explicar los dispositivos que se aplazaban hasta deferred_probe_timeout. El commit 35a672363ab3 (\"driver core: Ensure wait_for_device_probe() waits Until the deferred_probe_timeout fires\") intentó solucionar eso asegurándose de que wait_for_device_probe() espere a que deferred_probe_timeout expire antes de regresar. Sin embargo, si wait_for_device_probe() se llama desde el contexto kernel_init(): - Antes de deferred_probe_initcall() [2], hace que el proceso de arranque se cuelgue debido a un punto muerto. - Después de deferred_probe_initcall() [3], impide que kernel_init() continúe hasta que deferred_probe_timeout expire y supere el punto de deferred_probe_timeout que está tratando de esperar a que el espacio de usuario cargue módulos. Ninguna de estas opciones es buena. Por lo tanto, revierta los cambios a wait_for_device_probe(). [1] - https://lore.kernel.org/lkml/TYAPR01MB45443DF63B9EF29054F7C41FD8C60@TYAPR01MB4544.jpnprd01.prod.outlook.com/ [2] - https://lore.kernel.org/lkml/YowHNo4sBjr9ijZr@dev-arch.thelio-3990X/ [3] - https://lore.kernel.org/lkml/Yo3WvGnNk3LvLb7R@linutronix.de/"
}
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"lastModified": "2026-06-17T05:17:52.830",
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