CVE-2022-50092
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
dm thin: fix use-after-free crash in dm_sm_register_threshold_callback
If a metadata commit fails, the transaction will be aborted and the metadata space maps will be destroyed. If a DM table reload then happens for this failed thin-pool, a use-after-free will occur in dm_sm_register_threshold_callback (called from dm_pool_register_metadata_threshold).
Fix this by in dm_pool_register_metadata_threshold() by returning the -EINVAL error if the thin-pool is in fail mode. Also fail pool_ctr() with a new error message: "Error registering metadata threshold".
Detalles técnicos trazas, registros y código del informe original
Fault inject on pool metadata device reports: BUG: KASAN: use-after-free in dm_pool_register_metadata_threshold+0x40/0x80 Read of size 8 at addr ffff8881b9d50068 by task dmsetup/950 CPU: 7 PID: 950 Comm: dmsetup Tainted: G W 5.19.0-rc6 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x34/0x44 print_address_description.constprop.0.cold+0xeb/0x3f4 kasan_report.cold+0xe6/0x147 dm_pool_register_metadata_threshold+0x40/0x80 pool_ctr+0xa0a/0x1150 dm_table_add_target+0x2c8/0x640 table_load+0x1fd/0x430 ctl_ioctl+0x2c4/0x5a0 dm_ctl_ioctl+0xa/0x10 __x64_sys_ioctl+0xb3/0xd0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 This can be easily reproduced using: echo offline > /sys/block/sda/device/state dd if=/dev/zero of=/dev/mapper/thin bs=4k count=10 dmsetup load pool --table "0 20971520 thin-pool /dev/sda /dev/sdb 128 0 0"
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: 0.24%
- Percentil entre todas las CVEs puntuadas: 14
- 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-416
Referencias
- https://git.kernel.org/stable/c/05cef0999b3208b5a6ede1bfac855139e4de55ef
- https://git.kernel.org/stable/c/1a199fa9217d28511ff88529238fd9980ea64cf3
- https://git.kernel.org/stable/c/3534e5a5ed2997ca1b00f44a0378a075bd05e8a3
- https://git.kernel.org/stable/c/5e2cf705155a1514be3c96ea664a9cd356998ee7
- https://git.kernel.org/stable/c/e4dbe24f4bfd8377e7ba79fdcdb7c4d6eb1c6790
- https://git.kernel.org/stable/c/f83131a3071a0b61a4d7dca70f95adb3ffad920e
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm thin: fix use-after-free crash in dm_sm_register_threshold_callback\n\nFault inject on pool metadata device reports:\n BUG: KASAN: use-after-free in dm_pool_register_metadata_threshold+0x40/0x80\n Read of size 8 at addr ffff8881b9d50068 by task dmsetup/950\n\n CPU: 7 PID: 950 Comm: dmsetup Tainted: G W 5.19.0-rc6 #1\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014\n Call Trace:\n <TASK>\n dump_stack_lvl+0x34/0x44\n print_address_description.constprop.0.cold+0xeb/0x3f4\n kasan_report.cold+0xe6/0x147\n dm_pool_register_metadata_threshold+0x40/0x80\n pool_ctr+0xa0a/0x1150\n dm_table_add_target+0x2c8/0x640\n table_load+0x1fd/0x430\n ctl_ioctl+0x2c4/0x5a0\n dm_ctl_ioctl+0xa/0x10\n __x64_sys_ioctl+0xb3/0xd0\n do_syscall_64+0x35/0x80\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThis can be easily reproduced using:\n echo offline > /sys/block/sda/device/state\n dd if=/dev/zero of=/dev/mapper/thin bs=4k count=10\n dmsetup load pool --table \"0 20971520 thin-pool /dev/sda /dev/sdb 128 0 0\"\n\nIf a metadata commit fails, the transaction will be aborted and the\nmetadata space maps will be destroyed. If a DM table reload then\nhappens for this failed thin-pool, a use-after-free will occur in\ndm_sm_register_threshold_callback (called from\ndm_pool_register_metadata_threshold).\n\nFix this by in dm_pool_register_metadata_threshold() by returning the\n-EINVAL error if the thin-pool is in fail mode. Also fail pool_ctr()\nwith a new error message: \"Error registering metadata threshold\"."
},
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dm thin: corrección del fallo de uso tras liberación en dm_sm_register_threshold_callback Se informa de un fallo por inyección en el dispositivo de metadatos del grupo: ERROR: KASAN: uso tras liberación en dm_pool_register_metadata_threshold+0x40/0x80 Lectura de tamaño 8 en la dirección ffff8881b9d50068 por la tarea dmsetup/950 CPU: 7 PID: 950 Comm: dmsetup Contaminado: GW 5.19.0-rc6 #1 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 01/04/2014 Rastreo de llamadas: dump_stack_lvl+0x34/0x44 print_address_description.constprop.0.cold+0xeb/0x3f4 kasan_report.cold+0xe6/0x147 dm_pool_register_metadata_threshold+0x40/0x80 pool_ctr+0xa0a/0x1150 dm_table_add_target+0x2c8/0x640 table_load+0x1fd/0x430 ctl_ioctl+0x2c4/0x5a0 dm_ctl_ioctl+0xa/0x10 __x64_sys_ioctl+0xb3/0xd0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Esto se puede reproducir fácilmente usando: echo offline > /sys/block/sda/device/state dd if=/dev/zero of=/dev/mapper/thin bs=4k count=10 dmsetup load pool --table \"0 20971520 thin-pool /dev/sda /dev/sdb 128 0 0\" Si falla una confirmación de metadatos, la transacción se cancelará y los mapas de espacio de metadatos se destruirán. Si se recarga la tabla DM para este thin-pool fallido, se ejecutará un \"use after-free\" en dm_sm_register_threshold_callback (llamado desde dm_pool_register_metadata_threshold). Solucione esto en dm_pool_register_metadata_threshold() devolviendo el error -EINVAL si el thin-pool está en modo de fallo. También se produce un error en pool_ctr() con un nuevo mensaje de error: \"Error al registrar el umbral de metadatos\"."
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