{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2009-4031 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2009-4031 is a high-severity denial of service vulnerability in Linux kernel, published on 27 Nov 2009. 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-2009-4031 and fix it if it is affected.\n\nWhat it is: CVE-2009-4031 is a high-severity denial of service vulnerability in Linux kernel, published on 27 Nov 2009. 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-2009-4031 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-2009-4031/ (Markdown: https://insights.sbomify.com/CVE-2009-4031/index.md)","id":"CVE-2009-4031","markdown":"https://insights.sbomify.com/CVE-2009-4031/index.md","name":"CVE-2009-4031","record":{"aliases":["GHSA-vmf9-49hh-xhh2","RHSA-2009:1659"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel KVM","requires_auth":"low_privilege","summary":"Guest OS users can cause host denial of service via increased scheduling latency by exploiting a flaw in the KVM x86 emulator instruction fetching.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":7.8,"severity":"high","source":"nvd","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","version":"2.0"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"description":"The do_insn_fetch function in arch/x86/kvm/emulate.c in the x86 emulator in the KVM subsystem in the Linux kernel before 2.6.32-rc8-next-20091125 tries to interpret instructions that contain too many bytes to be valid, which allows guest OS users to cause a denial of service (increased scheduling latency) on the host OS via unspecified manipulations related to SMP support.","ecosystems":["Red Hat:rhel_virtualization:5::client","Red Hat:rhel_virtualization:5::server"],"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":"Denial of service in n/a","id":"CVE-2009-4031","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"denial_of_service","year":"2009"},"n_packages":10,"n_references":10,"next":{"headline":"Cross-site scripting in n/a","id":"CVE-2009-4032"},"packages":[{"ecosystem":"Red Hat:rhel_virtualization:5::client","fixed":["0:83-105.el5_4.13"],"introduced":["0"],"last_affected":[],"package":"kmod-kvm","purl":"pkg:rpm/redhat/kmod-kvm","source":"RHSA-2009:1659"},{"ecosystem":"Red Hat:rhel_virtualization:5::client","fixed":["0:83-105.el5_4.13"],"introduced":["0"],"last_affected":[],"package":"kvm","purl":"pkg:rpm/redhat/kvm","source":"RHSA-2009:1659"},{"ecosystem":"Red Hat:rhel_virtualization:5::client","fixed":["0:83-105.el5_4.13"],"introduced":["0"],"last_affected":[],"package":"kvm-debuginfo","purl":"pkg:rpm/redhat/kvm-debuginfo","source":"RHSA-2009:1659"},{"ecosystem":"Red Hat:rhel_virtualization:5::client","fixed":["0:83-105.el5_4.13"],"introduced":["0"],"last_affected":[],"package":"kvm-qemu-img","purl":"pkg:rpm/redhat/kvm-qemu-img","source":"RHSA-2009:1659"},{"ecosystem":"Red Hat:rhel_virtualization:5::client","fixed":["0:83-105.el5_4.13"],"introduced":["0"],"last_affected":[],"package":"kvm-tools","purl":"pkg:rpm/redhat/kvm-tools","source":"RHSA-2009:1659"},{"ecosystem":"Red Hat:rhel_virtualization:5::server","fixed":["0:83-105.el5_4.13"],"introduced":["0"],"last_affected":[],"package":"kmod-kvm","purl":"pkg:rpm/redhat/kmod-kvm","source":"RHSA-2009:1659"},{"ecosystem":"Red Hat:rhel_virtualization:5::server","fixed":["0:83-105.el5_4.13"],"introduced":["0"],"last_affected":[],"package":"kvm","purl":"pkg:rpm/redhat/kvm","source":"RHSA-2009:1659"},{"ecosystem":"Red Hat:rhel_virtualization:5::server","fixed":["0:83-105.el5_4.13"],"introduced":["0"],"last_affected":[],"package":"kvm-debuginfo","purl":"pkg:rpm/redhat/kvm-debuginfo","source":"RHSA-2009:1659"},{"ecosystem":"Red Hat:rhel_virtualization:5::server","fixed":["0:83-105.el5_4.13"],"introduced":["0"],"last_affected":[],"package":"kvm-qemu-img","purl":"pkg:rpm/redhat/kvm-qemu-img","source":"RHSA-2009:1659"},{"ecosystem":"Red Hat:rhel_virtualization:5::server","fixed":["0:83-105.el5_4.13"],"introduced":["0"],"last_affected":[],"package":"kvm-tools","purl":"pkg:rpm/redhat/kvm-tools","source":"RHSA-2009:1659"}],"prev":{"headline":"Path traversal in n/a","id":"CVE-2009-4030"},"products":["n/a"],"published":"2009-11-27","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":"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":"2024-08-07","vendors":["n/a"]},"summary":"Guest OS users can cause host denial of service via increased scheduling latency by exploiting a flaw in the KVM x86 emulator instruction fetching.","url":"https://insights.sbomify.com/CVE-2009-4031/"}