PT-2026-30167 · Linux · Linux
Published
2026-04-03
·
Updated
2026-04-03
·
CVE-2026-23473
None
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In the Linux kernel, the following vulnerability has been resolved:
io uring/poll: fix multishot recv missing EOF on wakeup race
When a socket send and shutdown() happen back-to-back, both fire
wake-ups before the receiver's task work has a chance to run. The first
wake gets poll ownership (poll refs=1), and the second bumps it to 2.
When io poll check events() runs, it calls io poll issue() which does a
recv that reads the data and returns IOU RETRY. The loop then drains all
accumulated refs (atomic sub return(2) -> 0) and exits, even though only
the first event was consumed. Since the shutdown is a persistent state
change, no further wakeups will happen, and the multishot recv can hang
forever.
Check specifically for HUP in the poll loop, and ensure that another
loop is done to check for status if more than a single poll activation
is pending. This ensures we don't lose the shutdown event.
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Related Identifiers
Affected Products
Linux