CVE-2022-50434
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: blk-mq: fix possible memleak when register 'hctx' failed There's issue as follows when do fault injection test: unreferenced object 0xffff888132a9f400 (size 512): comm "insmod", pid 308021, jiffies 4324277909 (age 509.733s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 08 f4 a9 32 81 88 ff ff ...........2.... 08 f4 a9 32 81 88 ff ff 00 00 00 00 00 00 00 00 ...2............ backtrace: [<00000000e8952bb4>] kmalloc_node_trace+0x22/0xa0 [<00000000f9980e0f>] blk_mq_alloc_and_init_hctx+0x3f1/0x7e0 [<000000002e719efa>] blk_mq_realloc_hw_ctxs+0x1e6/0x230 [<000000004f1fda40>] blk_mq_init_allocated_queue+0x27e/0x910 [<00000000287123ec>] __blk_mq_alloc_disk+0x67/0xf0 [<00000000a2a34657>] 0xffffffffa2ad310f [<00000000b173f718>] 0xffffffffa2af824a [<0000000095a1dabb>] do_one_initcall+0x87/0x2a0 [<00000000f32fdf93>] do_init_module+0xdf/0x320 [<00000000cbe8541e>] load_module+0x3006/0x3390 [<0000000069ed1bdb>] __do_sys_finit_module+0x113/0x1b0 [<00000000a1a29ae8>] do_syscall_64+0x35/0x80 [<000000009cd878b0>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 Fault injection context as follows: kobject_add blk_mq_register_hctx blk_mq_sysfs_register blk_register_queue device_add_disk null_add_dev.part.0 [null_blk] As 'blk_mq_register_hctx' may already add some objects when failed halfway, but there isn't do fallback, caller don't know which objects add failed. To solve above issue just do fallback when add objects failed halfway in 'blk_mq_register_hctx'.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-10-01 12:15:35.267000
Last modified
2026-11-05 21:16:58.743000
View original CVE JSON
{
"id": "CVE-2022-50434",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-10-01T12:15:35.267",
"lastModified": "2026-11-05T21:16:58.743",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-mq: fix possible memleak when register 'hctx' failed\n\nThere's issue as follows when do fault injection test:\nunreferenced object 0xffff888132a9f400 (size 512):\n comm \"insmod\", pid 308021, jiffies 4324277909 (age 509.733s)\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 08 f4 a9 32 81 88 ff ff ...........2....\n 08 f4 a9 32 81 88 ff ff 00 00 00 00 00 00 00 00 ...2............\n backtrace:\n [<00000000e8952bb4>] kmalloc_node_trace+0x22/0xa0\n [<00000000f9980e0f>] blk_mq_alloc_and_init_hctx+0x3f1/0x7e0\n [<000000002e719efa>] blk_mq_realloc_hw_ctxs+0x1e6/0x230\n [<000000004f1fda40>] blk_mq_init_allocated_queue+0x27e/0x910\n [<00000000287123ec>] __blk_mq_alloc_disk+0x67/0xf0\n [<00000000a2a34657>] 0xffffffffa2ad310f\n [<00000000b173f718>] 0xffffffffa2af824a\n [<0000000095a1dabb>] do_one_initcall+0x87/0x2a0\n [<00000000f32fdf93>] do_init_module+0xdf/0x320\n [<00000000cbe8541e>] load_module+0x3006/0x3390\n [<0000000069ed1bdb>] __do_sys_finit_module+0x113/0x1b0\n [<00000000a1a29ae8>] do_syscall_64+0x35/0x80\n [<000000009cd878b0>] entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nFault injection context as follows:\n kobject_add\n blk_mq_register_hctx\n blk_mq_sysfs_register\n blk_register_queue\n device_add_disk\n null_add_dev.part.0 [null_blk]\n\nAs 'blk_mq_register_hctx' may already add some objects when failed halfway,\nbut there isn't do fallback, caller don't know which objects add failed.\nTo solve above issue just do fallback when add objects failed halfway in\n'blk_mq_register_hctx'."
}
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"id": "CVE-2022-50434",
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"type": "Primary",
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