{"id":"CVE-2019-11477","published":"2019-06-18T23:34:51Z","modified":"2024-09-17T02:21:15Z","title":"Integer overflow in TCP_SKB_CB(skb)->tcp_gso_segs","vendor":"Linux","product":"Linux kernel","tier":"core","eol":null,"affectedVersions":[{"vendor":"Linux","product":"Linux kernel","versions":[">= 4.4, < 4.4.182",">= 4.9, < 4.9.182",">= 4.14, < 4.14.127",">= 4.19, < 4.19.52",">= 5.1, < 5.1.11"]}],"description":{"text":"Jonathan Looney discovered that the TCP_SKB_CB(skb)->tcp_gso_segs value was subject to an integer overflow in the Linux kernel when handling TCP Selective Acknowledgments (SACKs). A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commit 3b4929f65b0d8249f19a50245cd88ed1a2f78cff.","provenance":"source","from":"CVE.org"},"summary":{"text":"An integer overflow in the TCP_SKB_CB(skb)->tcp_gso_segs value affects the Linux kernel's TCP stack, specifically its handling of TCP Selective Acknowledgments (SACKs). A remote attacker with network access can trigger it without authentication or user interaction, causing a denial of service.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T07:13:14Z"},"cvss":{"score":7.5,"severity":"HIGH","version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.98745,"percentile":0.99925,"date":"2026-10-28","provenance":"source"},"kev":null,"vulncheckKev":null,"exploited":false,"otx":{"pulseCount":0,"pulses":[],"provenance":"machine"},"cwes":[{"id":"CWE-190","name":"Integer Overflow or Wraparound"}],"references":[{"url":"https://www.kb.cert.org/vuls/id/905115","tags":["third-party-advisory","x_refsource_CERT-VN"]},{"url":"http://www.openwall.com/lists/oss-security/2019/06/20/3","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://access.redhat.com/errata/RHSA-2019:1594","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2019:1602","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"http://www.openwall.com/lists/oss-security/2019/06/28/2","tags":["mailing-list","x_refsource_MLIST"]},{"url":"http://www.openwall.com/lists/oss-security/2019/07/06/3","tags":["mailing-list","x_refsource_MLIST"]},{"url":"http://www.openwall.com/lists/oss-security/2019/07/06/4","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://access.redhat.com/errata/RHSA-2019:1699","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"http://www.openwall.com/lists/oss-security/2019/10/24/1","tags":["mailing-list","x_refsource_MLIST"]},{"url":"http://www.openwall.com/lists/oss-security/2019/10/29/3","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://www.oracle.com/security-alerts/cpujan2020.html","tags":["x_refsource_MISC"]},{"url":"https://www.oracle.com/security-alerts/cpuoct2020.html","tags":["x_refsource_MISC"]},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=3b4929f65b0d8249f19a50245cd88ed1a2f78cff","tags":["x_refsource_MISC"]},{"url":"https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md","tags":["x_refsource_MISC"]},{"url":"https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic","tags":["x_refsource_MISC"]},{"url":"https://access.redhat.com/security/vulnerabilities/tcpsack","tags":["x_refsource_MISC"]},{"url":"https://support.f5.com/csp/article/K78234183","tags":["x_refsource_CONFIRM"]},{"url":"http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.html","tags":["x_refsource_MISC"]},{"url":"https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193","tags":["x_refsource_CONFIRM"]},{"url":"https://www.synology.com/security/advisory/Synology_SA_19_28","tags":["x_refsource_CONFIRM"]},{"url":"https://security.netapp.com/advisory/ntap-20190625-0001/","tags":["x_refsource_CONFIRM"]},{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0006","tags":["x_refsource_CONFIRM"]},{"url":"https://kc.mcafee.com/corporate/index?page=content&id=SB10287","tags":["x_refsource_CONFIRM"]},{"url":"http://www.vmware.com/security/advisories/VMSA-2019-0010.html","tags":["x_refsource_CONFIRM"]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf","tags":["x_refsource_CONFIRM"]},{"url":"https://www.us-cert.gov/ics/advisories/icsa-19-253-03","tags":["x_refsource_MISC"]},{"url":"http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html","tags":["x_refsource_MISC"]},{"url":"http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20191225-01-kernel-en","tags":["x_refsource_CONFIRM"]},{"url":"http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt","tags":["x_refsource_CONFIRM"]}],"techniques":[],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2019-3150","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2019-3150","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":1,"skipped":0,"earliest":"2019-07-22","earliestUrl":"https://github.com/sasqwatch/cve-2019-11477-poc","repos":[{"name":"sasqwatch/cve-2019-11477-poc","url":"https://github.com/sasqwatch/cve-2019-11477-poc","stars":8,"created":"2019-07-22"}]},"first":{"date":"2019-07-22","source":"PoC-in-GitHub","url":"https://github.com/sasqwatch/cve-2019-11477-poc"},"provenance":"source"},"exploitRefs":["http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.html","http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html"],"flow":[],"timeline":[{"date":"2019-06-18","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2019-11477","provenance":"source"},{"date":"2019-07-22","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/sasqwatch/cve-2019-11477-poc","provenance":"source"}],"speed":{"daysToPublicExploit":34,"firstExploitFrom":"PoC-in-GitHub","daysToKev":null},"priority":{"score":30.2,"factors":[{"name":"In a KEV catalog","points":0.0,"detail":"not listed"},{"name":"Recent KEV listing","points":0.0,"detail":"not listed"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.98,"detail":"percentile 0.9992"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"2 NVD exploit links; 1 PoC-in-GitHub repo"},{"name":"Mentioned in OTX pulses","points":0.0,"detail":"0 pulses"},{"name":"CVSS severity","points":5.25,"detail":"base score 7.5"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}