{"answers":{"affected":"It affects 7 products.","exploited":"There is no known exploitation of CVE-2021-33909 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-33909 is a high-severity vulnerability in Debian Debian Linux, published on 20 Jul 2021. 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-2021-33909 and fix it if it is affected.\n\nWhat it is: CVE-2021-33909 is a high-severity vulnerability in Debian Debian Linux, published on 20 Jul 2021. 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-2021-33909 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-2021-33909/ (Markdown: https://insights.sbomify.com/CVE-2021-33909/index.md)","id":"CVE-2021-33909","markdown":"https://insights.sbomify.com/CVE-2021-33909/index.md","name":"CVE-2021-33909","record":{"aliases":["A-195082750","ASB-A-195082750","AZL-6565","CLSA-2021-1632261963","CLSA-2021-1632261987","DEBIAN-CVE-2021-33909","GHSA-6g4v-3wmh-w3jg","OESA-2021-1293","RHSA-2021:2722","RHSA-2021:2723","UBUNTU-CVE-2021-33909","USN-5014-1"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["privilege_escalation","code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"An integer overflow in the Linux kernel seq_file allows unprivileged users to escalate privileges to root via out-of-bounds write.","user_interaction":"not_required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"fedora","vendor":"fedoraproject"},{"product":"linux_kernel","vendor":"linux"},{"product":"hci_management_node","vendor":"netapp"},{"product":"solidfire","vendor":"netapp"},{"product":"communications_session_border_controller","vendor":"oracle"},{"product":"sma1000_firmware","vendor":"sonicwall"}],"cvss":{"score":7.8,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"},{"id":"CWE-190","name":"Integer Overflow or Wraparound"}],"description":"fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.","ecosystems":["Red Hat:rhel_eus:8.1::baseos","Red Hat:rhel_eus:8.1::crb"],"exploits":{"exploitdb":0,"first_seen":"2021-07-21","github_poc":4,"max_poc_stars":77,"metasploit":0,"nuclei":0,"refs":[{"date":"2021-07-21T04:04:49Z","kind":"github_poc","ref":"https://github.com/Liang2580/CVE-2021-33909","stars":77,"title":"Sequoia exploit (7/20/21)"},{"date":"2021-09-02T04:51:54Z","kind":"github_poc","ref":"https://github.com/ChrisTheCoolHut/CVE-2021-33909","stars":43,"title":"CVE-2021-33909 Sequoia"},{"date":"2021-07-21T18:22:55Z","kind":"github_poc","ref":"https://github.com/baerwolf/cve-2021-33909","stars":6,"title":"This module fixes an issue in the kernels filesystem layer (CVE-2021-33909) by kprobe-replacing vulnerable functions during runtime"},{"date":"2021-07-26T03:24:35Z","kind":"github_poc","ref":"https://github.com/bbinfosec43/CVE-2021-33909","stars":5,"title":"Exploit code for CVE-2021-33909,Just a dump of removed https://github.com/AmIAHuman/ repo"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Integer overflow in n/a","id":"CVE-2021-33909","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","fedoraproject:fedora","linux:linux_kernel","netapp:hci_management_node","netapp:solidfire"],"type":"integer_overflow","year":"2021"},"n_packages":70,"n_references":20,"next":{"headline":"Denial of service in n/a","id":"CVE-2021-33910"},"packages":[{"ecosystem":"Red Hat:rhel_eus:8.1::baseos","fixed":["0:4.18.0-147.51.2.el8_1"],"introduced":["0"],"last_affected":[],"package":"bpftool","purl":"pkg:rpm/redhat/bpftool","source":"RHSA-2021:2722"},{"ecosystem":"Red Hat:rhel_eus:8.1::baseos","fixed":["0:4.18.0-147.51.2.el8_1"],"introduced":["0"],"last_affected":[],"package":"bpftool-debuginfo","purl":"pkg:rpm/redhat/bpftool-debuginfo","source":"RHSA-2021:2722"},{"ecosystem":"Red Hat:rhel_eus:8.1::baseos","fixed":["0:4.18.0-147.51.2.el8_1"],"introduced":["0"],"last_affected":[],"package":"kernel","purl":"pkg:rpm/redhat/kernel","source":"RHSA-2021:2722"},{"ecosystem":"Red Hat:rhel_eus:8.1::baseos","fixed":["0:4.18.0-147.51.2.el8_1"],"introduced":["0"],"last_affected":[],"package":"kernel-abi-whitelists","purl":"pkg:rpm/redhat/kernel-abi-whitelists","source":"RHSA-2021:2722"},{"ecosystem":"Red Hat:rhel_eus:8.1::baseos","fixed":["0:4.18.0-147.51.2.el8_1"],"introduced":["0"],"last_affected":[],"package":"kernel-core","purl":"pkg:rpm/redhat/kernel-core","source":"RHSA-2021:2722"},{"ecosystem":"Red Hat:rhel_eus:8.1::baseos","fixed":["0:4.18.0-147.51.2.el8_1"],"introduced":["0"],"last_affected":[],"package":"kernel-debug","purl":"pkg:rpm/redhat/kernel-debug","source":"RHSA-2021:2722"},{"ecosystem":"Red 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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":"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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["n/a"]},"summary":"An integer overflow in the Linux kernel seq_file allows unprivileged users to escalate privileges to root via out-of-bounds write.","url":"https://insights.sbomify.com/CVE-2021-33909/"}