Linux Kernel up to 6.18.32/7.0.9 io_uring infinite loop

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.32/7.0.9 and classified as critical. The impacted element is an unknown function of the component io_uring. Executing a manipulation can lead to infinite loop. This vulnerability is tracked as CVE-2026-53321. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.18.32/7.0.9. This vulnerability affects an unknown code of the component io_uring. The manipulation with an unknown input leads to a infinite loop vulnerability. The CWE definition for the vulnerability is CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-53321 since 06/09/2026. There are neither technical details nor an exploit publicly available.

Upgrading to version 6.18.33 or 7.0.10 eliminates this vulnerability. Applying the patch 39767f944a8c9e696566c37ad5b20131406c4b8d/cb3af525f8dfb8930f0c123e5755fa967a12d5c1/df8599ee18c0e5fe343ffe0b4c379636b8bb839a is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
• 6.18.15
• 6.18.16
• 6.18.17
• 6.18.18
• 6.18.19
• 6.18.20
• 6.18.21
• 6.18.22
• 6.18.23
• 6.18.24
• 6.18.25
• 6.18.26
• 6.18.27
• 6.18.28
• 6.18.29
• 6.18.30
• 6.18.31
• 6.18.32
• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9

License

• open-source

Website

• Vendor: https://www.kernel.org/

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