{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2021-20321 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-20321 is a medium-severity vulnerability in Debian Debian Linux, published on 18 Feb 2022. 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-2021-20321 and fix it if it is affected.\n\nWhat it is: CVE-2021-20321 is a medium-severity vulnerability in Debian Debian Linux, published on 18 Feb 2022. 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-2021-20321 in the wild and no public exploit code.\n\nAffected product: Debian Debian Linux. 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-2021-20321/ (Markdown: https://insights.sbomify.com/CVE-2021-20321/index.md)","id":"CVE-2021-20321","markdown":"https://insights.sbomify.com/CVE-2021-20321/index.md","name":"CVE-2021-20321","record":{"aliases":["A-222644279","ALSA-2021:5227","DEBIAN-CVE-2021-20321","PUB-A-222644279","RHSA-2021:5227","RHSA-2021:5241","RLSA-2021:5227","RLSA-2021:5241","UBUNTU-CVE-2021-20321"],"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 local attacker can crash the system by exploiting a race condition in the Linux kernel OverlayFS subsystem during specific rename operations.","user_interaction":"not_required","vuln_class":"race_condition"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"linux_kernel","vendor":"linux"},{"product":"enterprise_linux","vendor":"redhat"}],"cvss":{"score":4.7,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-362","name":"Concurrent Execution using Shared Resource with Improper Synchronization"}],"description":"A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system.","ecosystems":["AlmaLinux:8","Red Hat:enterprise_linux:8::baseos","Red Hat:enterprise_linux:8::crb","Red Hat:enterprise_linux:8::nfv","Red Hat:enterprise_linux:8::realtime","Rocky Linux:8"],"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":"Race condition in kernel","id":"CVE-2021-20321","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","linux:linux_kernel","redhat:enterprise_linux"],"type":"race_condition","year":"2021"},"n_packages":75,"n_references":4,"next":{"headline":"Information disclosure in kernel","id":"CVE-2021-20322"},"packages":[{"ecosystem":"AlmaLinux:8","fixed":["4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-libs-devel","purl":"pkg:rpm/almalinux/kernel-tools-libs-devel","source":"ALSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"bpftool","purl":"pkg:rpm/redhat/bpftool","source":"RHSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"bpftool-debuginfo","purl":"pkg:rpm/redhat/bpftool-debuginfo","source":"RHSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel","purl":"pkg:rpm/redhat/kernel","source":"RHSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel-abi-stablelists","purl":"pkg:rpm/redhat/kernel-abi-stablelists","source":"RHSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel-core","purl":"pkg:rpm/redhat/kernel-core","source":"RHSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel-cross-headers","purl":"pkg:rpm/redhat/kernel-cross-headers","source":"RHSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel-debug","purl":"pkg:rpm/redhat/kernel-debug","source":"RHSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-core","purl":"pkg:rpm/redhat/kernel-debug-core","source":"RHSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-debuginfo","purl":"pkg:rpm/redhat/kernel-debug-debuginfo","source":"RHSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-devel","purl":"pkg:rpm/redhat/kernel-debug-devel","source":"RHSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-modules","purl":"pkg:rpm/redhat/kernel-debug-modules","source":"RHSA-2021:5227"},{"ecosystem":"Red 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Hat:enterprise_linux:8::crb","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-debuginfo","purl":"pkg:rpm/redhat/kernel-debug-debuginfo","source":"RHSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo","purl":"pkg:rpm/redhat/kernel-debuginfo","source":"RHSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo-common-aarch64","purl":"pkg:rpm/redhat/kernel-debuginfo-common-aarch64","source":"RHSA-2021:5227"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:4.18.0-348.7.1.el8_5"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo-common-ppc64le","purl":"pkg:rpm/redhat/kernel-debuginfo-common-ppc64le","source":"RHSA-2021:5227"}],"prev":{"headline":"Information disclosure in kernel","id":"CVE-2021-20320"},"products":["kernel"],"published":"2022-02-18","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"sources":[{"class":"attribution","licence":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["n/a"]},"summary":"A local attacker can crash the system by exploiting a race condition in the Linux kernel OverlayFS subsystem during specific rename operations.","url":"https://insights.sbomify.com/CVE-2021-20321/"}