{"cve":"CVE-2022-49902","nvd":{"published":"2025-05-01T15:16:15.270","modified":"2026-06-17T05:19:28.137","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-401"],"references":["https://git.kernel.org/stable/c/4e68c5da60cd79950bd56287ae80b39d6261f995","https://git.kernel.org/stable/c/528677d3b4af985445bd4ac667485ded1ed11220","https://git.kernel.org/stable/c/fa81cbafbf5764ad5053512152345fab37a1fe18"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:01:22.920403922+00:00"},"epss":{"cve":"CVE-2022-49902","score":0.00199,"percentile":0.09765,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}