Linux Kernel: io_uring/napi busy poll capped at 10ms
CVE-2026-53321 Published on June 26, 2026
io_uring/napi: cap busy_poll_to 10 msec
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.
Products Associated with CVE-2026-53321
stack.watch emails you whenever new vulnerabilities are published in Linux Kernel or Canonical Ubuntu Linux. Just hit a watch button to start following.
Affected Versions
Linux:- Version 8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5 and below 39767f944a8c9e696566c37ad5b20131406c4b8d is affected.
- Version 8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5 and below cb3af525f8dfb8930f0c123e5755fa967a12d5c1 is affected.
- Version 8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5 and below df8599ee18c0e5fe343ffe0b4c379636b8bb839a is affected.
- Version 6.9 is affected.
- Before 6.9 is unaffected.
- Version 6.18.33, <= 6.18.* is unaffected.
- Version 7.0.10, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.