CVE-2026-99263Published

io_uring/poll: avoid retry wakeup loss when dropping ownership

Exact source revision recorded 3 Nov 2026 12:57:16 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

cve-program · CVE-2026-99263

Published

In the Linux kernel, the following vulnerability has been resolved: io_uring/poll: avoid retry wakeup loss when dropping ownership If a wakeup sets IO_POLL_RETRY_FLAG between the owning task consuming the existing instance of IO_POLL_RETRY_FLAG and the loop check of io_poll_check_events(), then we stall on processing the request until an unrelated wakeup comes along. Using atomic_cmpxchg instead of atomic_sub_return to guarantee both the count v and poll_refs are 0 and no wake-ups are missed.

Source published: 3 Nov 2026 11:48:15 UTC
Source modified: 3 Nov 2026 11:48:15 UTC
Observed here: 3 Nov 2026 12:57:16 UTC
Source terms: CVE Program Terms of Use

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