Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item commit 10dc95939817 ("io_uring/io-wq: check IO_WQ_BIT_EXIT inside work run loop") fixed the obvious case where io_worker_handle_work() took one exit-bit snapshot before draining pending work, but the fix stops one level too early. io_worker_handle_work() now re-checks IO_WQ_BIT_EXIT in its outer work run loop, yet it still snapshots that bit once before processing a whole dependent linked-work chain. If io_wq_exit_start() sets IO_WQ_BIT_EXIT after the first linked item has started, the remaining linked items can still reuse stale do_kill = false, skip IO_WQ_WORK_CANCEL, and continue running after exit has begun. Move the check further inside, so it covers linked items too. Note: this is a syzbot special as it loves setting up tons of slow linked work on weird devices like msr that take forever to read, and immediately close the ring. Exit then takes a long time.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 065dd936195a3466b8ebe5f9287400987ee3c063 before 14b7ecad2ec56699325180a744f4b19f046401bb; affected 27e47500fac23d15b7dc93ff650bc4844d2581bd before d179533c610e1b4c6aa436e3c1fd1b719d2c727c; affected d05d99573f81a091547b1778b9a50120f5d6c68a before 6e2f51f3e06773c2ee98ad09738f0908b48f76f9; affected 85eb83694a91c89d9abe615d717c0053c3efa714 before ea61b04e1d7242cb37f5ed2cc91cf21a493f6597; affected 2e8ca1078b14142db2ce51cbd18ff9971560046b before b6f179a653a934736c88d820fe0098c3c2532549; affected bdf0bf73006ea8af9327cdb85cfdff4c23a5f966 before 1636d85dc139b07c0449308f2bb5e0c7a2e0da99; affected 10dc959398175736e495f71c771f8641e1ca1907 before ab85765cbe3258b43dc6729af0e6ce3a87a133d8; affected 10dc959398175736e495f71c771f8641e1ca1907 before 29bef9934b2521f787bb15dd1985d4c0d12ae02a; affected 5.10.253 before 5.10.261; affected 5.15.203 before 5.15.212; affected 6.1.167 before 6.1.178; affected 6.6.122 before 6.6.145; affected 6.12.68 before 6.12.96; affected 6.18.8 before 6.18.39 |
| Linux / Linux | affected 6.19; unaffected 0 before 6.19; unaffected 5.10.261 through 5.10.*; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.96 through 6.12.*; unaffected 6.18.39 through 6.18.*; unaffected 7.1.4 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/14b7ecad2ec56699325180a744f4b19f046401bb
- https://git.kernel.org/stable/c/d179533c610e1b4c6aa436e3c1fd1b719d2c727c
- https://git.kernel.org/stable/c/6e2f51f3e06773c2ee98ad09738f0908b48f76f9
- https://git.kernel.org/stable/c/ea61b04e1d7242cb37f5ed2cc91cf21a493f6597
- https://git.kernel.org/stable/c/b6f179a653a934736c88d820fe0098c3c2532549
- https://git.kernel.org/stable/c/1636d85dc139b07c0449308f2bb5e0c7a2e0da99
- https://git.kernel.org/stable/c/ab85765cbe3258b43dc6729af0e6ce3a87a133d8
- https://git.kernel.org/stable/c/29bef9934b2521f787bb15dd1985d4c0d12ae02a
ADP enrichment
No English description supplied.