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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2022-49902 Detail

Description

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 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] ... 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: del_gendisk() rq_qos_exit() rqos->ops->exit(rqos); wbt_exit() 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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
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Hyperlink Resource
https://git.kernel.org/stable/c/4e68c5da60cd79950bd56287ae80b39d6261f995 Patch 
https://git.kernel.org/stable/c/528677d3b4af985445bd4ac667485ded1ed11220 Patch 
https://git.kernel.org/stable/c/fa81cbafbf5764ad5053512152345fab37a1fe18 Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-401 Missing Release of Memory after Effective Lifetime cwe source acceptance level NIST  

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2022-49902
NVD Published Date:
05/01/2025
NVD Last Modified:
05/07/2025
Source:
kernel.org