Description
In the Linux kernel, the following vulnerability has been resolved: io_uring: fix task_work add use-after-free with SQPOLL For SQPOLL, the sqpoll thread runs task_work off its own list and doesn't need to be told about it, so it can pop and complete a request as soon as mpscq_push() has published it. If that was the last request holding the ring alive, io_ring_exit_work() then frees the ctx, stops the thread, and with it the tctx, while io_req_normal_work_add() is still looking at both after the push: BUG: KASAN: slab-use-after-free in io_req_normal_work_add+0x439/0x510 Read of size 4 at addr ff11000000ca0000 by task repro/55 (...) BUG: KASAN: slab-use-after-free in queue_work_on+0x25/0x70 Write of size 8 at addr ff11000000c3bd00 by task repro/55 Hold an RCU read lock across the add, like io_req_local_work_add() already does, and have io_ring_exit_work() wait for a grace period for SQPOLL rings as well before freeing the ctx.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
af5d68f8892f8ee8f137648b79ceb2abc153a19b to < 42b3332efacfd2140be4cd0dedad4fb96b8ae90eaffectedaf5d68f8892f8ee8f137648b79ceb2abc153a19b to < 891bd8335a0de3bb15c3b797ce3026bbb0dbef6caffectedaf5d68f8892f8ee8f137648b79ceb2abc153a19b to < 395b25968fe854d4efaa19a8e9b7a5b6d1b3eea3affectedaf5d68f8892f8ee8f137648b79ceb2abc153a19b to < a92193c91e8839fe5fc209616ea95465ae4b919daffected
Linux Linux
Default version status: affected
6.9affected0 to < 6.9unaffected6.12.113 to ≤ 6.12.*unaffected6.18.56 to ≤ 6.18.*unaffected7.2.10 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected