Is CVE-2026-53321 in the CISA KEV catalog?

No. CVE-2026-53321 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the EPSS score for CVE-2026-53321?

CVE-2026-53321 has an EPSS score of 0.15% (5th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-53321?

Upgrade linux on debian unstable to 7.0.10-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-53321

UNSCORED

NVD

Description

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.

How to fix

Remediation Available

linuxDebian

Fixed in:7.0.10-1CVE-2026-53321

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3.1 Vector

No CVSS vector data available.

Exploit Intelligence

0.15%probability of exploitation in 30 days

5thpercentile

Low risk: more likely to be exploited than 5% of all known CVEs.

References

Other references3

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-30.