CVE-2026-53321
linux: In the Linux kernel, the following vulnerability has been resolved: io_uring/napi: cap busy_poll_to 10 msec Current...
CVE-2026-53321 is fixed in 34 products on 1 platform, first by ALAS2023-2026-1866, released June 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
5.5
medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0016
5th percentile
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| bpftool6.18 · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| bpftool6.18-debuginfo · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| dtb-aarch64 · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-64kb · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-64kb · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-64kb · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-azure · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-azure · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-azure · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-default · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-default · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-default · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23237-1 | Aug 11, 2026 |
| kernel-default-base · opensuse-leap 16.0 | 6.12.0-160000.37.1.160000.2.19 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-default-base · sles 15.7 | 6.4.0-150700.53.78.1.150700.17.43.2 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-default-base · sles 16.0 | 6.12.0-160000.37.1.160000.2.19 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-docs · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-docs · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-docs · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-kvmsmall · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-kvmsmall · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-livepatch-6.18.33-63.124 · amzn 2023 | 1:1.0-0.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| kernel-livepatch-SLE15-SP7-RT_Update_19 · sles 15.7 | 1-150700.1.5.1 | SUSE-SU-2026:3810-1 | Aug 26, 2026 |
| kernel-livepatch-SLE15-SP7_Update_20 · sles 15.7 | 1-150700.15.3.2 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-obs-build · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-obs-build · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-obs-qa · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-obs-qa · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-rt · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-source · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-source · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-source · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-syms · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-syms · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-syms · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-zfcpdump · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-zfcpdump · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-zfcpdump · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel6.18 · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| kernel6.18-debuginfo · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| kernel6.18-debuginfo-common-aarch64 · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| kernel6.18-debuginfo-common-x86_64 · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| kernel6.18-devel · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| kernel6.18-headers · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| kernel6.18-modules-extra · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| kernel6.18-modules-extra-common · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| kernel6.18-tools · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| kernel6.18-tools-debuginfo · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| kernel6.18-tools-devel · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| linux · Debian 13.5 (trixie) | 6.12.115-2 | DEBIAN-CVE-2026-53321 | Jun 27, 2026 |
| linux · Debian 14 | 7.0.10-1 | DEBIAN-CVE-2026-53321 | Jun 27, 2026 |
| perf6.18 · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| perf6.18-debuginfo · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| python3-perf6.18 · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
| python3-perf6.18-debuginfo · amzn 2023 | 1:6.18.33-63.124.amzn2023 | ALAS2023-2026-1866 | Jun 22, 2026 |
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