CVE-2026-99263

CVE-2026-99263: vulnerability in Linux

io_uring/poll: avoid retry wakeup loss when dropping ownership

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0Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

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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.
Affected products
Linux · Linux
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