Answer in brief
CVE-2026-53321 records a Medium severity (CVSS 5.5) vulnerability in io_uring/napi: cap busy_poll_to 10 msec. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5 <42785efe813e5a7d815f3b6be126e1bc0d12d2b6 || >=8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5 <39767f944a8c9e696566c37ad5b20131406c4b8d || >=8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5 <cb3af525f8dfb8930f0c123e5755fa967a12d5c1 || >=8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5 <df8599ee18c0e5fe343ffe0b4c379636b8bb839a | 42785efe813e5a7d815f3b6be126e1bc0d12d2b6, 39767f944a8c9e696566c37ad5b20131406c4b8d, cb3af525f8dfb8930f0c123e5755fa967a12d5c1, df8599ee18c0e5fe343ffe0b4c379636b8bb839a |
| Linux/Linuxgeneric | 6.9 | Not reported |
Published upstream
Jun 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 26, 2026
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.
Quoted source text, attributed separately from HOL analysis.