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CVE-2022-49902

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

block: Fix possible memory leak for rq_wb on add_disk failure

kmemleak reported memory leaks in device_add_disk():

kmemleak: 3 new suspected memory leaks

It is because the memory allocated in wbt_enable_default() is not released in device_add_disk() error path. Normally, these memory are freed in:

So rq_qos_exit() is called to free the rq_wb memory for wbt_init(). However in the error path of device_add_disk(), only blk_unregister_queue() is called and make rq_wb memory leaked.

Add rq_qos_exit() to the error path to fix it.

Detalles técnicos trazas, registros y código del informe original
unreferenced object 0xffff88800f420800 (size 512):
  comm "modprobe", pid 4275, jiffies 4295639067 (age 223.512s)
  hex dump (first 32 bytes):
    04 00 00 00 08 00 00 00 01 00 00 00 00 00 00 00  ................
    00 e1 f5 05 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000d3662699>] kmalloc_trace+0x26/0x60
    [<00000000edc7aadc>] wbt_init+0x50/0x6f0
    [<0000000069601d16>] wbt_enable_default+0x157/0x1c0
    [<0000000028fc393f>] blk_register_queue+0x2a4/0x420
    [<000000007345a042>] device_add_disk+0x6fd/0xe40
    [<0000000060e6aab0>] nbd_dev_add+0x828/0xbf0 [nbd]
    ...

del_gendisk()
  rq_qos_exit()
    rqos->ops->exit(rqos);
      wbt_exit()

CVSS

Probabilidad de explotación (EPSS)

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)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: Fix possible memory leak for rq_wb on add_disk failure\n\nkmemleak reported memory leaks in device_add_disk():\n\nkmemleak: 3 new suspected memory leaks\n\nunreferenced object 0xffff88800f420800 (size 512):\n  comm \"modprobe\", pid 4275, jiffies 4295639067 (age 223.512s)\n  hex dump (first 32 bytes):\n    04 00 00 00 08 00 00 00 01 00 00 00 00 00 00 00  ................\n    00 e1 f5 05 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [<00000000d3662699>] kmalloc_trace+0x26/0x60\n    [<00000000edc7aadc>] wbt_init+0x50/0x6f0\n    [<0000000069601d16>] wbt_enable_default+0x157/0x1c0\n    [<0000000028fc393f>] blk_register_queue+0x2a4/0x420\n    [<000000007345a042>] device_add_disk+0x6fd/0xe40\n    [<0000000060e6aab0>] nbd_dev_add+0x828/0xbf0 [nbd]\n    ...\n\nIt is because the memory allocated in wbt_enable_default() is not\nreleased in device_add_disk() error path.\nNormally, these memory are freed in:\n\ndel_gendisk()\n  rq_qos_exit()\n    rqos->ops->exit(rqos);\n      wbt_exit()\n\nSo rq_qos_exit() is called to free the rq_wb memory for wbt_init().\nHowever in the error path of device_add_disk(), only\nblk_unregister_queue() is called and make rq_wb memory leaked.\n\nAdd rq_qos_exit() to the error path to fix it."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bloque: Reparar posible pérdida de memoria para rq_wb en caso de error de add_disk kmemleak informó pérdidas de memoria en device_add_disk(): kmemleak: 3 nuevas pérdidas de memoria sospechosas objeto no referenciado 0xffff88800f420800 (tamaño 512): comm \"modprobe\", pid 4275, jiffies 4295639067 (edad 223.512s) volcado hexadecimal (primeros 32 bytes): 04 00 00 00 08 00 00 00 01 00 00 00 00 00 00 00 00 ................ 00 e1 f5 05 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [&lt;00000000d3662699&gt;] kmalloc_trace+0x26/0x60 [&lt;00000000edc7aadc&gt;] wbt_init+0x50/0x6f0 [&lt;0000000069601d16&gt;] wbt_enable_default+0x157/0x1c0 [&lt;0000000028fc393f&gt;] blk_register_queue+0x2a4/0x420 [&lt;000000007345a042&gt;] device_add_disk+0x6fd/0xe40 [&lt;0000000060e6aab0&gt;] nbd_dev_add+0x828/0xbf0 [nbd] ... Esto se debe a que la memoria asignada en wbt_enable_default() no se libera en la ruta de error device_add_disk(). Normalmente, esta memoria se libera en: del_gendisk() rq_qos_exit() rqos-&gt;ops-&gt;exit(rqos); wbt_exit(). Por lo tanto, se llama a rq_qos_exit() para liberar la memoria rq_wb para wbt_init(). Sin embargo, en la ruta de error de device_add_disk(), solo se llama a blk_unregister_queue(), lo que provoca una fuga de memoria en rq_wb. Agregue rq_qos_exit() a la ruta de error para corregirlo."
    }
  ],
  "lastModified": "2026-06-17T05:19:28.137",
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