CVE-2022-50434None▾ SunlitIn 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): co…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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'.
Linux >= 67aec14ce87fe25bdfff7dbf468556333df11c4e < 654870789c3c1b9763316ef1c71d7a449127b175Linux >= 67aec14ce87fe25bdfff7dbf468556333df11c4e < cb186eb47fb9dd327bdefa15f0c5fc55c53a40ddLinux >= 67aec14ce87fe25bdfff7dbf468556333df11c4e < 02bc8bc6eab03c84373281b85cb6e98747172ff7Linux >= 67aec14ce87fe25bdfff7dbf468556333df11c4e < 87fd18016a47ea8ae12641377a390172c4aa97a7Linux >= 67aec14ce87fe25bdfff7dbf468556333df11c4e < e8022da1fa2fdf2fa204b445dd3354e7a66d085aLinux >= 67aec14ce87fe25bdfff7dbf468556333df11c4e < eff45bfbc25a2509a6362dea6e699e14083c693cLinux >= 67aec14ce87fe25bdfff7dbf468556333df11c4e < 4b7fafa5f39b15c3a6ca3b95e534d05d6904cc95Linux >= 67aec14ce87fe25bdfff7dbf468556333df11c4e < 33e8a3f61814ea30615d0fafaf50477975d6c1caLinux >= 67aec14ce87fe25bdfff7dbf468556333df11c4e < 4b7a21c57b14fbcd0e1729150189e5933f5088e9Linux 3.16Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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