{"cve":{"cve_id":"CVE-2009-4272","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.11051,"epss_percentile":0.95338,"epss_as_of":"2026-06-23","description":"A certain Red Hat patch for net/ipv4/route.c in the Linux kernel 2.6.18 on Red Hat Enterprise Linux (RHEL) 5 allows remote attackers to cause a denial of service (deadlock) via crafted packets that force collisions in the IPv4 routing hash table, and trigger a routing \"emergency\" in which a hash chain is too long.  NOTE: this is related to an issue in the Linux kernel before 2.6.31, when the kernel routing cache is disabled, involving an uninitialized pointer and a panic.","published_at":"2010-01-27T17:00:00Z","last_modified_at":"2026-06-16T23:13:22.107000Z","cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-667"],"nvd_references":["https://bugzilla.redhat.com/show_bug.cgi?id=545411","http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.31","http://support.avaya.com/css/P8/documents/100073666","https://exchange.xforce.ibmcloud.com/vulnerabilities/55808","http://www.openwall.com/lists/oss-security/2010/01/20/1","http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=b6280b47a7a42970d098a3059f4ebe7e55e90d8d","https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11167","https://rhn.redhat.com/errata/RHSA-2010-0095.html","https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7026","https://rhn.redhat.com/errata/RHSA-2010-0046.html","http://www.openwall.com/lists/oss-security/2010/01/20/6","http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=73e42897e8e5619eacb787d2ce69be12f47cfc21"],"vuln_status":"Modified","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:05:14.531034Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack 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kernel","version_start":"2.6.18","version_start_inclusive":true,"version_end":"2.6.18","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:linux:linux_kernel:2.6.18:-:*:*:*:*:*:*"},{"vendor_slug":"redhat","vendor_name":"RedHat","product_slug":"enterprise-linux-desktop","product_name":"enterprise_linux_desktop","version_start":"5.0","version_start_inclusive":true,"version_end":"5.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:*"},{"vendor_slug":"redhat","vendor_name":"RedHat","product_slug":"enterprise-linux-eus","product_name":"enterprise_linux_eus","version_start":"5.4","version_start_inclusive":true,"version_end":"5.4","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:redhat:enterprise_linux_eus:5.4:*:*:*:*:*:*:*"},{"vendor_slug":"redhat","vendor_name":"RedHat","product_slug":"enterprise-linux-server","product_name":"enterprise_linux_server","version_start":"5.0","version_start_inclusive":true,"version_end":"5.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:redhat:enterprise_linux_server:5.0:*:*:*:*:*:*:*"},{"vendor_slug":"redhat","vendor_name":"RedHat","product_slug":"enterprise-linux-workstation","product_name":"enterprise_linux_workstation","version_start":"5.0","version_start_inclusive":true,"version_end":"5.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:redhat:enterprise_linux_workstation:5.0:*:*:*:*:*:*:*"},{"vendor_slug":"redhat","vendor_name":"RedHat","product_slug":"virtualization","product_name":"virtualization","version_start":"5.0","version_start_inclusive":true,"version_end":"5.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:redhat:virtualization:5.0:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=545411","source_type":"MISC","tags":[]},{"url":"http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.31","source_type":"MISC","tags":[]},{"url":"http://support.avaya.com/css/P8/documents/100073666","source_type":"MISC","tags":[]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/55808","source_type":"MISC","tags":[]},{"url":"http://www.openwall.com/lists/oss-security/2010/01/20/1","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=b6280b47a7a42970d098a3059f4ebe7e55e90d8d","source_type":"MISC","tags":[]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11167","source_type":"MISC","tags":[]},{"url":"https://rhn.redhat.com/errata/RHSA-2010-0095.html","source_type":"MISC","tags":[]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7026","source_type":"MISC","tags":[]},{"url":"https://rhn.redhat.com/errata/RHSA-2010-0046.html","source_type":"MISC","tags":[]},{"url":"http://www.openwall.com/lists/oss-security/2010/01/20/6","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=73e42897e8e5619eacb787d2ce69be12f47cfc21","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2010-01-27T17:00:00Z","label":"CVE 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