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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."}, {"lang": "es", "value": "Jonathan Looney descubri\u00f3 que la implementaci\u00f3n de la cola de retransmisi\u00f3n de TCP en tcp_fragment en el kernel de Linux podr\u00eda estar fragmentada cuando se manejan ciertas secuencias de Reconocimiento Selectivo (SACK) de TCP. Un atacante remoto podr\u00eda usar esto para causar una denegaci\u00f3n de servicio. 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{"acknowledgement": "Red Hat would like to thank Jonathan Looney (Netflix Information Security) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2019:1488", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "kernel-0:2.6.32-754.15.3.el6", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2019-06-17T00:00:00Z"}, {"advisory": "RHSA-2019:1490", "cpe": "cpe:/o:redhat:rhel_aus:6.5", "package": "kernel-0:2.6.32-431.95.3.el6", "product_name": "Red Hat Enterprise Linux 6.5 Advanced Update Support", "release_date": "2019-06-17T00:00:00Z"}, {"advisory": "RHSA-2019:1489", "cpe": "cpe:/o:redhat:rhel_aus:6.6", "package": "kernel-0:2.6.32-504.79.3.el6", "product_name": "Red Hat Enterprise Linux 6.6 Advanced Update Support", "release_date": "2019-06-17T00:00:00Z"}, {"advisory": "RHSA-2019:1486", "cpe": "cpe:/a:redhat:rhel_extras_rt:7", "package": "kernel-rt-0:3.10.0-957.21.3.rt56.935.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": 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"cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "redhat-release-virtualization-host-0:4.2-11.1.el7", "product_name": "Red Hat Virtualization 4.2 for Red Hat Enterprise Linux 7.6 EUS", "release_date": "2019-06-25T00:00:00Z"}, {"advisory": "RHSA-2019:1594", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "redhat-virtualization-host-0:4.2-20190618.0.el7_6", "product_name": "Red Hat Virtualization 4.2 for Red Hat Enterprise Linux 7.6 EUS", "release_date": "2019-06-25T00:00:00Z"}, {"advisory": "RHSA-2019:1699", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "redhat-release-virtualization-host-0:4.3.4-1.el7ev", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 7", "release_date": "2019-07-08T00:00:00Z"}, {"advisory": "RHSA-2019:1699", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "redhat-virtualization-host-0:4.3.4-20190620.3.el7_6", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 7", "release_date": "2019-07-08T00:00:00Z"}], "bugzilla": {"description": "Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service", "id": "1719128", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1719128"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "verified"}, "cwe": "CWE-400", "details": ["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.", "An excessive resource consumption flaw was found in the way the Linux kernel's networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel's socket buffer (SKB) data structure becomes fragmented, which leads to increased resource utilization to traverse and process these fragments as further SACK segments are received on the same TCP connection. A remote attacker could use this flaw to cause a denial of service (DoS) by sending a crafted sequence of SACK segments on a TCP connection."], "mitigation": {"lang": "en:us", "value": "For mitigation, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/tcpsack"}, "name": "CVE-2019-11478", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2019-06-17T17:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-11478\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-11478\nhttps://patchwork.ozlabs.org/project/netdev/list/?series=114310\nhttps://www.openwall.com/lists/oss-security/2019/06/17/5"], "statement": "Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/tcpsack\nRed Hat Enterprise Linux 5 is now in Maintenance Support 2 Phase of maintenance life cycle. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.", "threat_severity": "Moderate"}