CVE-2022-50434
blk-mq: fix possible memleak when register 'hctx' failed
- Published
- Updated
- Reserved
- Assigned by
- Linux
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'.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected 67aec14ce87fe25bdfff7dbf468556333df11c4e – < 654870789c3c1b9763316ef1c71d7a449127b175
- affected 67aec14ce87fe25bdfff7dbf468556333df11c4e – < cb186eb47fb9dd327bdefa15f0c5fc55c53a40dd
- affected 67aec14ce87fe25bdfff7dbf468556333df11c4e – < 02bc8bc6eab03c84373281b85cb6e98747172ff7
- affected 67aec14ce87fe25bdfff7dbf468556333df11c4e – < 87fd18016a47ea8ae12641377a390172c4aa97a7
- affected 67aec14ce87fe25bdfff7dbf468556333df11c4e – < e8022da1fa2fdf2fa204b445dd3354e7a66d085a
- affected 67aec14ce87fe25bdfff7dbf468556333df11c4e – < eff45bfbc25a2509a6362dea6e699e14083c693c
- affected 67aec14ce87fe25bdfff7dbf468556333df11c4e – < 4b7fafa5f39b15c3a6ca3b95e534d05d6904cc95
- affected 67aec14ce87fe25bdfff7dbf468556333df11c4e – < 33e8a3f61814ea30615d0fafaf50477975d6c1ca
- affected 67aec14ce87fe25bdfff7dbf468556333df11c4e – < 4b7a21c57b14fbcd0e1729150189e5933f5088e9
- affected 3.16
- unaffected < 3.16
- unaffected 4.9.337 – ≤ 4.9.*
- unaffected 4.14.303 – ≤ 4.14.*
- unaffected 4.19.270 – ≤ 4.19.*
- unaffected 5.4.229 – ≤ 5.4.*
- unaffected 5.10.163 – ≤ 5.10.*
- unaffected 5.15.86 – ≤ 5.15.*
- unaffected 6.0.16 – ≤ 6.0.*
- unaffected 6.1.2 – ≤ 6.1.*
- unaffected 6.2 – ≤ *
References (9)
- https://git.kernel.org/stable/c/654870789c3c1b9763316ef1c71d7a449127b175 (opens in a new tab)
- https://git.kernel.org/stable/c/cb186eb47fb9dd327bdefa15f0c5fc55c53a40dd (opens in a new tab)
- https://git.kernel.org/stable/c/02bc8bc6eab03c84373281b85cb6e98747172ff7 (opens in a new tab)
- https://git.kernel.org/stable/c/87fd18016a47ea8ae12641377a390172c4aa97a7 (opens in a new tab)
- https://git.kernel.org/stable/c/e8022da1fa2fdf2fa204b445dd3354e7a66d085a (opens in a new tab)
- https://git.kernel.org/stable/c/eff45bfbc25a2509a6362dea6e699e14083c693c (opens in a new tab)
- https://git.kernel.org/stable/c/4b7fafa5f39b15c3a6ca3b95e534d05d6904cc95 (opens in a new tab)
- https://git.kernel.org/stable/c/33e8a3f61814ea30615d0fafaf50477975d6c1ca (opens in a new tab)
- https://git.kernel.org/stable/c/4b7a21c57b14fbcd0e1729150189e5933f5088e9 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-50434)Record last updated .