{
  "threat_severity" : "Moderate",
  "public_date" : "2019-04-16T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: integer overflow in tcp_ack_update_rtt in net/ipv4/tcp_input.c",
    "id" : "1771496",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1771496"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.3",
    "cvss3_scoring_vector" : "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-190",
  "details" : [ "An issue was discovered in net/ipv4/sysctl_net_ipv4.c in the Linux kernel before 5.0.11. There is a net/ipv4/tcp_input.c signed integer overflow in tcp_ack_update_rtt() when userspace writes a very large integer to /proc/sys/net/ipv4/tcp_min_rtt_wlen, leading to a denial of service or possibly unspecified other impact, aka CID-19fad20d15a6.", "A flaw was reported in the Linux kernel's TCP subsystem while calculating a packet round trip time, when a sysctl parameter (/proc/sys/net/ipv4/tcp_min_rtt_wlen) is set incorrectly. This causes an integer overflow which can lead to a denial Of service (DOS) attack." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 7",
    "release_date" : "2020-03-09T00:00:00Z",
    "advisory" : "RHSA-2020:0740",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7",
    "package" : "kernel-alt-0:4.14.0-115.18.1.el7a"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2020-04-28T00:00:00Z",
    "advisory" : "RHSA-2020:1567",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8::nfv",
    "package" : "kernel-rt-0:4.18.0-193.rt13.51.el8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2020-04-28T00:00:00Z",
    "advisory" : "RHSA-2020:1769",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kernel-0:4.18.0-193.el8"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 5",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise MRG 2",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/a:redhat:enterprise_mrg:2"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2019-18805\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-18805" ],
  "name" : "CVE-2019-18805",
  "mitigation" : {
    "value" : "This flaw can be mitigated by setting the sysctl parameter (/proc/sys/net/ipv4/tcp_min_rtt_wlen) with 300 which means the packet time will not exceed more then 5 minutes and which should not cause an integer overflow.",
    "lang" : "en:us"
  },
  "csaw" : false
}