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'.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00033.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

No data.

No data.

No data.

No data.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/02bc8bc6eab03c84373281b85cb6e98747172ff7 cve-icon cve-icon
https://git.kernel.org/stable/c/33e8a3f61814ea30615d0fafaf50477975d6c1ca cve-icon cve-icon
https://git.kernel.org/stable/c/4b7a21c57b14fbcd0e1729150189e5933f5088e9 cve-icon cve-icon
https://git.kernel.org/stable/c/4b7fafa5f39b15c3a6ca3b95e534d05d6904cc95 cve-icon cve-icon
https://git.kernel.org/stable/c/654870789c3c1b9763316ef1c71d7a449127b175 cve-icon cve-icon
https://git.kernel.org/stable/c/87fd18016a47ea8ae12641377a390172c4aa97a7 cve-icon cve-icon
https://git.kernel.org/stable/c/cb186eb47fb9dd327bdefa15f0c5fc55c53a40dd cve-icon cve-icon
https://git.kernel.org/stable/c/e8022da1fa2fdf2fa204b445dd3354e7a66d085a cve-icon cve-icon
https://git.kernel.org/stable/c/eff45bfbc25a2509a6362dea6e699e14083c693c cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025100159-CVE-2022-50434-e4db@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2022-50434 cve-icon
https://www.cve.org/CVERecord?id=CVE-2022-50434 cve-icon
History

Thu, 02 Oct 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low

Wed, 01 Oct 2025 12:00:00 +0000

Type Values Removed Values Added
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'.
Title blk-mq: fix possible memleak when register 'hctx' failed
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-10-01T11:42:12.160Z

Reserved: 2025-09-17T14:53:07.009Z

Link: CVE-2022-50434

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2025-10-01T12:15:35.267

Modified: 2025-10-01T12:15:35.267

Link: CVE-2022-50434

cve-icon Redhat

Severity : Low

Publid Date: 2025-10-01T00:00:00Z

Links: CVE-2022-50434 - Bugzilla

cve-icon OpenCVE Enrichment

No data.