Bug 2493708 (CVE-2026-53321) - CVE-2026-53321 kernel: io_uring/napi: cap busy_poll_to 10 msec
Summary: CVE-2026-53321 kernel: io_uring/napi: cap busy_poll_to 10 msec
Keywords:
Status: NEW
Alias: CVE-2026-53321
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-26 21:02 UTC by OSIDB Bzimport
Modified: 2026-06-29 10:44 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2026-06-26 21:02:04 UTC
In the Linux kernel, the following vulnerability has been resolved:

io_uring/napi: cap busy_poll_to 10 msec

Currently there's no cap on the maximum amount of time that napi is
allowed to poll if no events are found, which can lead to kernel
complaints on a task being stuck as there's no conditional rescheduling
done within that loop.

Just cap it to 10 msec in total, that's already way above any kind of
sane value that will reap any benefits, yet low enough that it's
nowhere near being able to trigger preemption complaints.

Comment 1 Mauro Matteo Cascella 2026-06-29 10:41:24 UTC
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062622-CVE-2026-53321-d475@gregkh/T


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