# CVE-2022-50434: linux: In the Linux kernel, the following vulnerability has been resolved:  blk-mq: fix possible memleak when register 'hctx...

CVE-2022-50434 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50434, released October 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-50434
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 1, 2025

## 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'.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.4-1 | [DEBIAN-CVE-2022-50434](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50434.md) | Oct 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.4-1 | [DEBIAN-CVE-2022-50434](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50434.md) | Oct 1, 2025 |
| Linux | linux Debian 14 | 6.1.4-1 | [DEBIAN-CVE-2022-50434](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50434.md) | Oct 1, 2025 |

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