{"id":"CVE-2019-11478","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-11478","generatedAt":"2026-10-28T20:28:12.759Z","title":"A remote attacker could use this to cause a denial of service.","description":"Jonathan Looney discovered that the TCP retransmission queue implementation in tcp_fragment in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences. 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 f070ef2ac66716357066b683fb0baf55f8191a2e.","published":"2019-06-19T00:15:13.000Z","lastModified":"2026-06-17T02:12:59.000Z","status":"Modified","sourceIdentifier":"security@ubuntu.com","cvss":{"version":"3.0","score":7.5,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-770","CWE-400"],"affected":["linux/linux kernel","f5/big-ip advanced firewall manager","f5/big-ip access policy manager","f5/big-ip application acceleration manager","f5/big-ip link controller","f5/big-ip policy enforcement manager","f5/big-ip webaccelerator","f5/big-ip application security manager","f5/big-ip local traffic manager","f5/big-ip fraud protection service","f5/big-ip global traffic manager","f5/big-ip analytics","f5/big-ip edge gateway","f5/big-ip domain name system","canonical/ubuntu linux","redhat/enterprise linux atomic host","redhat/enterprise linux","redhat/enterprise linux aus","redhat/enterprise linux eus","redhat/enterprise mrg","ivanti/connect secure","pulsesecure/pulse policy secure","pulsesecure/pulse secure virtual application delivery controller","f5/traffix signaling delivery controller"],"epss":{"score":0.94686,"percentile":0.99856,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.92873,"percentile":0.99829},{"date":"2026-09-22","score":0.94686,"percentile":0.99855}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 94.7%, higher than 100% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.html","tags":["Third Party Advisory","VDB 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Advisory"],"source":"security@ubuntu.com"},{"url":"https://kc.mcafee.com/corporate/index?page=content&id=SB10287","source":"security@ubuntu.com"},{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0007","source":"security@ubuntu.com"},{"url":"https://seclists.org/bugtraq/2019/Jul/30","source":"security@ubuntu.com"},{"url":"https://security.netapp.com/advisory/ntap-20190625-0001/","source":"security@ubuntu.com"},{"url":"https://support.f5.com/csp/article/K26618426","tags":["Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic","tags":["Mitigation","Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"https://www.kb.cert.org/vuls/id/905115","source":"security@ubuntu.com"},{"url":"https://www.oracle.com/security-alerts/cpujan2020.html","source":"security@ubuntu.com"},{"url":"https://www.oracle.com/security-alerts/cpuoct2020.html","source":"security@ubuntu.com"},{"url":"https://www.synology.com/security/advisory/Synology_SA_19_28","source":"security@ubuntu.com"},{"url":"https://www.us-cert.gov/ics/advisories/icsa-19-253-03","source":"security@ubuntu.com"},{"url":"http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.html","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://packetstormsecurity.com/files/154408/Kernel-Live-Patch-Security-Notice-LSN-0055-1.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2019/06/28/2","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2019/07/06/3","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2019/07/06/4","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2019/10/24/1","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2019/10/29/3","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.vmware.com/security/advisories/VMSA-2019-0010.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2019:1594","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2019:1602","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2019:1699","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/security/vulnerabilities/tcpsack","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=f070ef2ac66716357066b683fb0baf55f8191a2e","tags":["Mailing List","Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://kc.mcafee.com/corporate/index?page=content&id=SB10287","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0007","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://seclists.org/bugtraq/2019/Jul/30","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20190625-0001/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.f5.com/csp/article/K26618426","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic","tags":["Mitigation","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.kb.cert.org/vuls/id/905115","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpujan2020.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuoct2020.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.synology.com/security/advisory/Synology_SA_19_28","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.us-cert.gov/ics/advisories/icsa-19-253-03","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-11478","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}