{
  "threat_severity" : "Important",
  "public_date" : "2023-04-13T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: out-of-bounds write in qfq_change_class function",
    "id" : "2192671",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2192671"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.0",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-787",
  "details" : [ "qfq_change_class in net/sched/sch_qfq.c in the Linux kernel before 6.2.13 allows an out-of-bounds write because lmax can exceed QFQ_MIN_LMAX.", "An out-of-bounds memory access flaw was found in the Linux kernel’s traffic control (QoS) subsystem in how a user triggers the qfq_change_class function with an incorrect MTU value of the network device used as lmax. This flaw allows a local user to crash or potentially escalate their privileges on the system." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 6 Extended Lifecycle Support",
    "release_date" : "2024-04-16T00:00:00Z",
    "advisory" : "RHSA-2024:1831",
    "cpe" : "cpe:/o:redhat:rhel_els:6",
    "package" : "kernel-0:2.6.32-754.53.1.el6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "release_date" : "2023-11-21T00:00:00Z",
    "advisory" : "RHSA-2023:7424",
    "cpe" : "cpe:/a:redhat:rhel_extras_rt:7",
    "package" : "kernel-rt-0:3.10.0-1160.105.1.rt56.1256.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "release_date" : "2023-11-21T00:00:00Z",
    "advisory" : "RHSA-2023:7423",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7",
    "package" : "kernel-0:3.10.0-1160.105.1.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "release_date" : "2024-03-13T00:00:00Z",
    "advisory" : "RHSA-2024:1323",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.6 Advanced Update Support(Disable again in 2026 - SPRHEL-7118)",
    "release_date" : "2024-01-16T00:00:00Z",
    "advisory" : "RHSA-2024:0261",
    "cpe" : "cpe:/o:redhat:rhel_aus:7.6",
    "package" : "kernel-0:3.10.0-957.109.1.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.7 Advanced Update Support",
    "release_date" : "2024-01-16T00:00:00Z",
    "advisory" : "RHSA-2024:0262",
    "cpe" : "cpe:/o:redhat:rhel_aus:7.7",
    "package" : "kernel-0:3.10.0-1062.82.1.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2023-11-14T00:00:00Z",
    "advisory" : "RHSA-2023:6901",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8::nfv",
    "package" : "kernel-rt-0:4.18.0-513.5.1.rt7.307.el8_9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2023-11-14T00:00:00Z",
    "advisory" : "RHSA-2023:7077",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kernel-0:4.18.0-513.5.1.el8_9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Advanced Update Support",
    "release_date" : "2024-03-12T00:00:00Z",
    "advisory" : "RHSA-2024:1268",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.2",
    "package" : "kernel-0:4.18.0-193.128.1.el8_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Telecommunications Update Service",
    "release_date" : "2024-03-12T00:00:00Z",
    "advisory" : "RHSA-2024:1269",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.2::nfv",
    "package" : "kernel-rt-0:4.18.0-193.128.1.rt13.179.el8_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Telecommunications Update Service",
    "release_date" : "2024-03-12T00:00:00Z",
    "advisory" : "RHSA-2024:1268",
    "cpe" : "cpe:/o:redhat:rhel_tus:8.2",
    "package" : "kernel-0:4.18.0-193.128.1.el8_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions",
    "release_date" : "2024-03-12T00:00:00Z",
    "advisory" : "RHSA-2024:1268",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.2",
    "package" : "kernel-0:4.18.0-193.128.1.el8_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions",
    "release_date" : "2024-03-12T00:00:00Z",
    "advisory" : "RHSA-2024:1278",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.2",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "release_date" : "2024-03-19T00:00:00Z",
    "advisory" : "RHSA-2024:1367",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.4",
    "package" : "kernel-0:4.18.0-305.125.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Telecommunications Update Service",
    "release_date" : "2024-03-19T00:00:00Z",
    "advisory" : "RHSA-2024:1382",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.4::nfv",
    "package" : "kernel-rt-0:4.18.0-305.125.1.rt7.201.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Telecommunications Update Service",
    "release_date" : "2024-03-19T00:00:00Z",
    "advisory" : "RHSA-2024:1367",
    "cpe" : "cpe:/o:redhat:rhel_tus:8.4",
    "package" : "kernel-0:4.18.0-305.125.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions",
    "release_date" : "2024-03-19T00:00:00Z",
    "advisory" : "RHSA-2024:1367",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.4",
    "package" : "kernel-0:4.18.0-305.125.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions",
    "release_date" : "2024-03-19T00:00:00Z",
    "advisory" : "RHSA-2024:1377",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.4",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Extended Update Support",
    "release_date" : "2024-01-23T00:00:00Z",
    "advisory" : "RHSA-2024:0378",
    "cpe" : "cpe:/o:redhat:rhel_eus:8.6",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Extended Update Support",
    "release_date" : "2024-01-25T00:00:00Z",
    "advisory" : "RHSA-2024:0412",
    "cpe" : "cpe:/o:redhat:rhel_eus:8.6",
    "package" : "kernel-0:4.18.0-372.87.1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Extended Update Support",
    "release_date" : "2024-01-30T00:00:00Z",
    "advisory" : "RHSA-2024:0554",
    "cpe" : "cpe:/o:redhat:rhel_eus:8.8",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Extended Update Support",
    "release_date" : "2024-01-30T00:00:00Z",
    "advisory" : "RHSA-2024:0575",
    "cpe" : "cpe:/o:redhat:rhel_eus:8.8",
    "package" : "kernel-0:4.18.0-477.43.1.el8_8"
  }, {
    "product_name" : "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8",
    "release_date" : "2024-01-25T00:00:00Z",
    "advisory" : "RHSA-2024:0412",
    "cpe" : "cpe:/o:redhat:rhev_hypervisor:4.4::el8",
    "package" : "kernel-0:4.18.0-372.87.1.el8_6"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2023-31436\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-31436\nhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3037933448f60f9acb705997eae62013ecb81e0d" ],
  "name" : "CVE-2023-31436",
  "mitigation" : {
    "value" : "To mitigate this issue, prevent the module, sch_qfq from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to blacklist a kernel module to prevent it from loading automatically.",
    "lang" : "en:us"
  },
  "csaw" : false
}