{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47365 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47365 is a medium-severity denial of service vulnerability in Linux kernel, published on 21 May 2024. 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-2021-47365 and fix it if it is affected.\n\nWhat it is: CVE-2021-47365 is a medium-severity denial of service vulnerability in Linux kernel, published on 21 May 2024. 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-2021-47365 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-2021-47365/ (Markdown: https://insights.sbomify.com/CVE-2021-47365/index.md)","id":"CVE-2021-47365","markdown":"https://insights.sbomify.com/CVE-2021-47365/index.md","name":"CVE-2021-47365","record":{"aliases":["DEBIAN-CVE-2021-47365","GHSA-95jq-x6q9-c9cq","UBUNTU-CVE-2021-47365"],"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":"A page reference leak in the Linux kernel AFS filesystem can cause significant memory exhaustion, leading to denial of service.","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":[{"id":"CWE-459","name":"Incomplete Cleanup"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix page leak\n\nThere's a loop in afs_extend_writeback() that adds extra pages to a write\nwe want to make to improve the efficiency of the writeback by making it\nlarger.  This loop stops, however, if we hit a page we can't write back\nfrom immediately, but it doesn't get rid of the page ref we speculatively\nacquired.\n\nThis was caused by the removal of the cleanup loop when the code switched\nfrom using find_get_pages_contig() to xarray scanning as the latter only\ngets a single page at a time, not a batch.\n\nFix this by putting the page on a ref on an early break from the loop.\nUnfortunately, we can't just add that page to the pagevec we're employing\nas we'll go through that and add those pages to the RPC call.\n\nThis was found by the generic/074 test.  It leaks ~4GiB of RAM each time it\nis run - which can be observed with \"top\".","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":"afs: Fix page leak","id":"CVE-2021-47365","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"afs: Fix corruption in reads at fpos 2G-4G from an OpenAFS server","id":"CVE-2021-47366"},"packages":[],"prev":{"headline":"comedi: Fix memory leak in compat_insnlist()","id":"CVE-2021-47364"},"products":["Linux"],"published":"2024-05-21","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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-11","vendors":["Linux"]},"summary":"A page reference leak in the Linux kernel AFS filesystem can cause significant memory exhaustion, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2021-47365/"}