{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-53321 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-53321 is a medium-severity denial of service vulnerability in Linux kernel, published on 26 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-53321 and fix it if it is affected.\n\nWhat it is: CVE-2026-53321 is a medium-severity denial of service vulnerability in Linux kernel, published on 26 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-53321 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-53321/ (Markdown: https://insights.sbomify.com/CVE-2026-53321/index.md)","id":"CVE-2026-53321","markdown":"https://insights.sbomify.com/CVE-2026-53321/index.md","name":"CVE-2026-53321","record":{"aliases":["BELL-CVE-2026-53321","DEBIAN-CVE-2026-53321","GHSA-g22f-3wv9-pgvj","ROOT-OS-DEBIAN-13-CVE-2026-53321","UBUNTU-CVE-2026-53321"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"An attacker can cause a denial of service by triggering excessive busy polling in the Linux kernel io_uring NAPI implementation, leading to system unresponsiveness.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/napi: cap busy_poll_to 10 msec\n\nCurrently there's no cap on the maximum amount of time that napi is\nallowed to poll if no events are found, which can lead to kernel\ncomplaints on a task being stuck as there's no conditional rescheduling\ndone within that loop.\n\nJust cap it to 10 msec in total, that's already way above any kind of\nsane value that will reap any benefits, yet low enough that it's\nnowhere near being able to trigger preemption complaints.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"io_uring/napi: cap busy_poll_to 10 msec","id":"CVE-2026-53321","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"vfio/pci: Clean up DMABUFs before disabling function","id":"CVE-2026-53322"},"packages":[],"prev":{"headline":"nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()","id":"CVE-2026-53320"},"products":["Linux"],"published":"2026-06-26","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-21","vendors":["Linux"]},"summary":"An attacker can cause a denial of service by triggering excessive busy polling in the Linux kernel io_uring NAPI implementation, leading to system unresponsiveness.","url":"https://insights.sbomify.com/CVE-2026-53321/"}