fkie_cve-2022-49755
Vulnerability from fkie_nvd
Published
2025-03-27 17:15
Modified
2025-04-01 15:40
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait
While performing fast composition switch, there is a possibility that the
process of ffs_ep0_write/ffs_ep0_read get into a race condition
due to ep0req being freed up from functionfs_unbind.
Consider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait
by taking a lock &ffs->ev.waitq.lock. However, the functionfs_unbind isn't
bounded so it can go ahead and mark the ep0req to NULL, and since there
is no NULL check in ffs_ep0_queue_wait we will end up in use-after-free.
Fix this by making a serialized execution between the two functions using
a mutex_lock(ffs->mutex).
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 6.2 | |
| linux | linux_kernel | 6.2 | |
| linux | linux_kernel | 6.2 | |
| linux | linux_kernel | 6.2 |
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait\n\nWhile performing fast composition switch, there is a possibility that the\nprocess of ffs_ep0_write/ffs_ep0_read get into a race condition\ndue to ep0req being freed up from functionfs_unbind.\n\nConsider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait\nby taking a lock \u0026ffs-\u003eev.waitq.lock. However, the functionfs_unbind isn\u0027t\nbounded so it can go ahead and mark the ep0req to NULL, and since there\nis no NULL check in ffs_ep0_queue_wait we will end up in use-after-free.\n\nFix this by making a serialized execution between the two functions using\na mutex_lock(ffs-\u003emutex)."
},
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"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: gadget: f_fs: Evitar ejecuci\u00f3n durante ffs_ep0_queue_wait Mientras se realiza un cambio de composici\u00f3n r\u00e1pida, existe la posibilidad de que el proceso de ffs_ep0_write/ffs_ep0_read entre en una condici\u00f3n de ejecuci\u00f3n debido a que ep0req se libera de functionfs_unbind. Considere el escenario en el que ffs_ep0_write llama a ffs_ep0_queue_wait tomando un bloqueo \u0026amp;ffs-\u0026gt;ev.waitq.lock. Sin embargo, functionfs_unbind no est\u00e1 limitada, por lo que puede seguir adelante y marcar ep0req como NULL, y dado que no hay una comprobaci\u00f3n de NULL en ffs_ep0_queue_wait, terminaremos en use-after-free. Solucione esto realizando una ejecuci\u00f3n serializada entre las dos funciones usando un mutex_lock(ffs-\u0026gt;mutex)."
}
],
"id": "CVE-2022-49755",
"lastModified": "2025-04-01T15:40:57.590",
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"baseScore": 7.8,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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