CVE-2022-49993
Full vulnerability record from the local CVENow database.
Description
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). 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
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-06-18 11:15:26.977000
Last modified
2026-11-05 20:17:20.027000
View original CVE JSON
{
"id": "CVE-2022-49993",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-06-18T11:15:26.977",
"lastModified": "2026-11-05T20:17:20.027",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"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"
},
{
"lang": "es",
"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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"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
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