io_uring: fix task_work add use-after-free with SQPOLL

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98858
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:40 UTC
Updated2026-10-19 10:19:49 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected af5d68f8892f8ee8f137648b79ceb2abc153a19b 42b3332efacfd2140be4cd0dedad4fb96b8ae90e git Not specified
CNA Linux Linux affected af5d68f8892f8ee8f137648b79ceb2abc153a19b 891bd8335a0de3bb15c3b797ce3026bbb0dbef6c git Not specified
CNA Linux Linux affected af5d68f8892f8ee8f137648b79ceb2abc153a19b 395b25968fe854d4efaa19a8e9b7a5b6d1b3eea3 git Not specified
CNA Linux Linux affected af5d68f8892f8ee8f137648b79ceb2abc153a19b a92193c91e8839fe5fc209616ea95465ae4b919d git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a92193c91e8839fe5fc209616ea95465ae4b919d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/395b25968fe854d4efaa19a8e9b7a5b6d1b3eea3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/891bd8335a0de3bb15c3b797ce3026bbb0dbef6c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/42b3332efacfd2140be4cd0dedad4fb96b8ae90e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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