Description
In the Linux kernel, the following vulnerability has been resolved:
io-wq: Fix memory leak in worker creation
If the CPU mask allocation for a node fails, then the memory allocated for the 'io_wqe' struct of the current node doesn't get freed on the error handling path, since it has not yet been added to the 'wqes' array.
This was spotted when fuzzing v6.1-rc1 with Syzkaller: BUG: memory leak unreferenced object 0xffff8880093d5000 (size 1024): comm "syz-executor.2", pid 7701, jiffies 4295048595 (age 13.900s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000cb463369>] __kmem_cache_alloc_node+0x18e/0x720 [<00000000147a3f9c>] kmalloc_node_trace+0x2a/0x130 [<000000004e107011>] io_wq_create+0x7b9/0xdc0 [<00000000c38b2018>] io_uring_alloc_task_context+0x31e/0x59d [<00000000867399da>] __io_uring_add_tctx_node.cold+0x19/0x1ba [<000000007e0e7a79>] io_uring_setup.cold+0x1b80/0x1dce [<00000000b545e9f6>] __x64_sys_io_uring_setup+0x5d/0x80 [<000000008a8a7508>] do_syscall_64+0x5d/0x90 [<000000004ac08bec>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
Metrics
No CVSS score has been published yet.
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 0e03496d1967abf1ebb151a24318c07d07f41f7f, < b6e2c54be37d5eb4f6666e6aa59cd0581c7ffc3c; >= 0e03496d1967abf1ebb151a24318c07d07f41f7f, < ed981911a7c90a604f4a2bee908ab07e3b786aca; >= 0e03496d1967abf1ebb151a24318c07d07f41f7f, < 996d3efeb091c503afd3ee6b5e20eabf446fd955 |
| Linux | Linux | 5.14 |
References
Timeline
- Published
- Dec 9, 2025
- Last modified
- Nov 10, 2026
- NVD status
- Deferred