{"api_version":"1","generated_at":"2026-07-23T11:32:51+00:00","cve":"CVE-2009-4031","urls":{"html":"https://cve.report/CVE-2009-4031","api":"https://cve.report/api/cve/CVE-2009-4031.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2009-4031","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2009-4031"},"summary":{"title":"CVE-2009-4031","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.","state":"PUBLISHED","assigner":"redhat","published_at":"2009-11-29 13:07:32","updated_at":"2026-04-23 00:35:47"},"problem_types":["CWE-20","n/a"],"metrics":[{"version":"2.0","source":"nvd@nist.gov","type":"Primary","score":"7.8","severity":"","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","data":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:C","baseScore":7.8,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"COMPLETE"}}],"references":[{"url":"http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00006.html","name":"http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00006.html","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"title":"[security-announce] SUSE Security Announcement: Linux kernel (SUSE-SA:20","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11089","name":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11089","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"title":"Repository  /  Oval Repository","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=541160","name":"https://bugzilla.redhat.com/show_bug.cgi?id=541160","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Issue Tracking","Third Party Advisory"],"title":"Bug 541160 – CVE-2009-4031 kernel: KVM: x86 emulator: limit instructions to 15 bytes","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://secunia.com/advisories/37720","name":"http://secunia.com/advisories/37720","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"title":"Fedora update for kernel - Secunia Advisories - Vulnerability Information - Secunia.com","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00777.html","name":"https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00777.html","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"title":"[SECURITY] Fedora 10 Update: kernel-2.6.27.41-170.2.117.fc10","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://www.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.32-rc8-next-20091125.gz","name":"http://www.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.32-rc8-next-20091125.gz","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Vendor Advisory"],"title":"404: File not found","mime":"text/html","httpstatus":"404","archivestatus":"404"},{"url":"http://www.securityfocus.com/bid/37130","name":"http://www.securityfocus.com/bid/37130","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory","VDB Entry"],"title":"Linux Kernel KVM Large SMP Instruction Local Denial of Service Vulnerability","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git%3Ba=commit%3Bh=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88","name":"http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git%3Ba=commit%3Bh=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"","mime":"text/html","httpstatus":"404","archivestatus":"404"},{"url":"http://www.openwall.com/lists/oss-security/2009/11/25/3","name":"http://www.openwall.com/lists/oss-security/2009/11/25/3","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Mailing List","Third Party Advisory"],"title":"oss-security - Re: CVE request: kernel: KVM: x86 emulator: limit\n instructions to 15 bytes","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://www.openwall.com/lists/oss-security/2009/11/25/1","name":"http://www.openwall.com/lists/oss-security/2009/11/25/1","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Mailing List","Third Party Advisory"],"title":"oss-security - CVE request: kernel: KVM: x86 emulator: limit instructions to 15\n bytes","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git;a=commit;h=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88","name":"CONFIRM:http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git;a=commit;h=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88","refsource":"MITRE","tags":[],"title":"kernel/git/avi/kvm.git - Unnamed repository; edit this file 'description' to name the repository.","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2009-4031","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-4031","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"n/a","product":"n/a","version":"affected n/a","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2009","cve_id":"4031","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"4031","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"2.6.32","cpe7":"-","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"4031","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"2.6.32","cpe7":"rc1","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"4031","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"2.6.32","cpe7":"rc2","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"4031","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"2.6.32","cpe7":"rc3","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"4031","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"2.6.32","cpe7":"rc4","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"4031","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"2.6.32","cpe7":"rc5","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"4031","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"2.6.32","cpe7":"rc6","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"4031","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"2.6.32","cpe7":"rc7","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"providerMetadata":{"dateUpdated":"2024-08-07T06:45:50.938Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"name":"[oss-security] 20091125 Re: CVE request: kernel: KVM: x86 emulator: limit instructions to 15 bytes","tags":["mailing-list","x_refsource_MLIST","x_transferred"],"url":"http://www.openwall.com/lists/oss-security/2009/11/25/1"},{"name":"37720","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred"],"url":"http://secunia.com/advisories/37720"},{"name":"SUSE-SA:2010:018","tags":["vendor-advisory","x_refsource_SUSE","x_transferred"],"url":"http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00006.html"},{"tags":["x_refsource_CONFIRM","x_transferred"],"url":"http://www.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.32-rc8-next-20091125.gz"},{"name":"oval:org.mitre.oval:def:11089","tags":["vdb-entry","signature","x_refsource_OVAL","x_transferred"],"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11089"},{"name":"[oss-security] 20091125 CVE request: kernel: KVM: x86 emulator: limit instructions to 15 bytes","tags":["mailing-list","x_refsource_MLIST","x_transferred"],"url":"http://www.openwall.com/lists/oss-security/2009/11/25/3"},{"name":"FEDORA-2009-13098","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"],"url":"https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00777.html"},{"tags":["x_refsource_CONFIRM","x_transferred"],"url":"http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git%3Ba=commit%3Bh=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88"},{"name":"37130","tags":["vdb-entry","x_refsource_BID","x_transferred"],"url":"http://www.securityfocus.com/bid/37130"},{"tags":["x_refsource_CONFIRM","x_transferred"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=541160"}],"title":"CVE Program Container"}],"cna":{"affected":[{"product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}]}],"datePublic":"2009-11-25T00:00:00.000Z","descriptions":[{"lang":"en","value":"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."}],"problemTypes":[{"descriptions":[{"description":"n/a","lang":"en","type":"text"}]}],"providerMetadata":{"dateUpdated":"2017-09-18T12:57:01.000Z","orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat"},"references":[{"name":"[oss-security] 20091125 Re: CVE request: kernel: KVM: x86 emulator: limit instructions to 15 bytes","tags":["mailing-list","x_refsource_MLIST"],"url":"http://www.openwall.com/lists/oss-security/2009/11/25/1"},{"name":"37720","tags":["third-party-advisory","x_refsource_SECUNIA"],"url":"http://secunia.com/advisories/37720"},{"name":"SUSE-SA:2010:018","tags":["vendor-advisory","x_refsource_SUSE"],"url":"http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00006.html"},{"tags":["x_refsource_CONFIRM"],"url":"http://www.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.32-rc8-next-20091125.gz"},{"name":"oval:org.mitre.oval:def:11089","tags":["vdb-entry","signature","x_refsource_OVAL"],"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11089"},{"name":"[oss-security] 20091125 CVE request: kernel: KVM: x86 emulator: limit instructions to 15 bytes","tags":["mailing-list","x_refsource_MLIST"],"url":"http://www.openwall.com/lists/oss-security/2009/11/25/3"},{"name":"FEDORA-2009-13098","tags":["vendor-advisory","x_refsource_FEDORA"],"url":"https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00777.html"},{"tags":["x_refsource_CONFIRM"],"url":"http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git%3Ba=commit%3Bh=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88"},{"name":"37130","tags":["vdb-entry","x_refsource_BID"],"url":"http://www.securityfocus.com/bid/37130"},{"tags":["x_refsource_CONFIRM"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=541160"}]}},"cveMetadata":{"assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","assignerShortName":"redhat","cveId":"CVE-2009-4031","datePublished":"2009-11-27T19:00:00.000Z","dateReserved":"2009-11-20T00:00:00.000Z","dateUpdated":"2024-08-07T06:45:50.938Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.1"},"nvd":{"publishedDate":"2009-11-29 13:07:32","lastModifiedDate":"2026-04-23 00:35:47","problem_types":["CWE-20","n/a"],"metrics":{"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:C","baseScore":7.8,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"COMPLETE"},"baseSeverity":"HIGH","exploitabilityScore":10,"impactScore":6.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"2.6.32","matchCriteriaId":"76B13D5A-329B-4D9B-BFA3-C0DB166F4E18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:2.6.32:-:*:*:*:*:*:*","matchCriteriaId":"37B2E2B1-3E39-4DBA-817D-08F34D9F6E53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:2.6.32:rc1:*:*:*:*:*:*","matchCriteriaId":"C85D4E0A-14DA-4884-AF6F-A0F54304430F"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:2.6.32:rc2:*:*:*:*:*:*","matchCriteriaId":"1C8471AA-44D7-4D19-82B6-C4B999C65F97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:2.6.32:rc3:*:*:*:*:*:*","matchCriteriaId":"218DE1D1-3843-4076-9AE4-70AA0FD99B3E"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:2.6.32:rc4:*:*:*:*:*:*","matchCriteriaId":"2677114B-AF05-42EB-BBC8-FA85CD631C21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:2.6.32:rc5:*:*:*:*:*:*","matchCriteriaId":"FA8D64E1-A700-4D9E-9063-EC3CFC1A6D98"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:2.6.32:rc6:*:*:*:*:*:*","matchCriteriaId":"1B6C0A59-556F-4579-9AD2-4ABAE01FE2CF"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:2.6.32:rc7:*:*:*:*:*:*","matchCriteriaId":"DBE3083A-0FA6-4854-8F65-05E8364B3A9B"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2009","CveId":"4031","Ordinal":"1","Title":"CVE-2009-4031","CVE":"CVE-2009-4031","Year":"2009"},"notes":[{"CveYear":"2009","CveId":"4031","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"CVE-2009-4031"},{"CveYear":"2009","CveId":"4031","Ordinal":"2","NoteData":"2009-11-27","Type":"Other","Title":"Published"},{"CveYear":"2009","CveId":"4031","Ordinal":"3","NoteData":"2017-09-18","Type":"Other","Title":"Modified"}]}}}