CVE-2022-49993
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
loop: Check for overflow while configuring loop
The userspace can configure a loop using an ioctl call, wherein a configuration of type loop_config is passed (see lo_ioctl()'s case on line 1550 of drivers/block/loop.c). This proceeds to call loop_configure() which in turn calls loop_set_status_from_info() (see line 1050 of loop.c), passing &config->info which is of type loop_info64*. This function then sets the appropriate values, like the offset.
loop_device has lo_offset of type loff_t (see line 52 of loop.c), which is typdef-chained to long long, whereas loop_info64 has lo_offset of type __u64 (see line 56 of include/uapi/linux/loop.h).
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The function directly copies offset from info to the device as follows (See line 980 of loop.c): lo->lo_offset = info->lo_offset;
This results in an overflow, which triggers a warning in iomap_iter() due to a call to iomap_iter_done() which has: WARN_ON_ONCE(iter->iomap.offset > iter->pos);
Thus, check for negative value during loop_set_status_from_info().
Bug report: https://syzkaller.appspot.com/bug?id=c620fe14aac810396d3c3edc9ad73848bf69a29e
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: 0.25%
- Percentil entre todas las CVEs puntuadas: 15
- 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).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/0455bef69028c65065f16bb04635591b2374249b
- https://git.kernel.org/stable/c/18e28817cb516b39de6281f6db9b0618b2cc7b42
- https://git.kernel.org/stable/c/6858933131d0dadac071c4d33335a9ea4b8e76cf
- https://git.kernel.org/stable/c/9be7fa7ead18a48940df7b59d993bbc8b9055c15
- https://git.kernel.org/stable/c/a217715338fd48f72114725aa7a40e484a781ca7
- https://git.kernel.org/stable/c/adf0112d9b8acb03485624220b4934f69bf13369
- https://git.kernel.org/stable/c/b40877b8562c5720d0a7fce20729f56b75a3dede
- https://git.kernel.org/stable/c/c490a0b5a4f36da3918181a8acdc6991d967c5f3
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nloop: Check for overflow while configuring loop\n\nThe userspace can configure a loop using an ioctl call, wherein\na configuration of type loop_config is passed (see lo_ioctl()'s\ncase on line 1550 of drivers/block/loop.c). This proceeds to call\nloop_configure() which in turn calls loop_set_status_from_info()\n(see line 1050 of loop.c), passing &config->info which is of type\nloop_info64*. This function then sets the appropriate values, like\nthe offset.\n\nloop_device has lo_offset of type loff_t (see line 52 of loop.c),\nwhich is typdef-chained to long long, whereas loop_info64 has\nlo_offset of type __u64 (see line 56 of include/uapi/linux/loop.h).\n\nThe function directly copies offset from info to the device as\nfollows (See line 980 of loop.c):\n\tlo->lo_offset = info->lo_offset;\n\nThis results in an overflow, which triggers a warning in iomap_iter()\ndue to a call to iomap_iter_done() which has:\n\tWARN_ON_ONCE(iter->iomap.offset > iter->pos);\n\nThus, check for negative value during loop_set_status_from_info().\n\nBug report: https://syzkaller.appspot.com/bug?id=c620fe14aac810396d3c3edc9ad73848bf69a29e"
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: loop: Comprobar si hay desbordamiento al configurar loop El espacio de usuario puede configurar un bucle mediante una llamada ioctl, en la que se pasa una configuración de tipo loop_config (consulte el caso de lo_ioctl() en la línea 1550 de drivers/block/loop.c). Esto procede a llamar a loop_configure() que a su vez llama a loop_set_status_from_info() (consulte la línea 1050 de loop.c), pasando &config->info que es de tipo loop_info64*. Esta función luego establece los valores apropiados, como el desplazamiento. loop_device tiene lo_offset de tipo loff_t (consulte la línea 52 de loop.c), que está encadenado por typdef a long long, mientras que loop_info64 tiene lo_offset de tipo __u64 (consulte la línea 56 de include/uapi/linux/loop.h). La función copia directamente el desplazamiento de info al dispositivo como se indica a continuación (véase la línea 980 de loop.c): lo->lo_offset = info->lo_offset; Esto genera un desbordamiento que genera una advertencia en iomap_iter() debido a una llamada a iomap_iter_done() que tiene: WARN_ON_ONCE(iter->iomap.offset > iter->pos); Por lo tanto, se debe verificar si hay un valor negativo durante loop_set_status_from_info(). Informe de error: https://syzkaller.appspot.com/bug?id=c620fe14aac810396d3c3edc9ad73848bf69a29e"
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