{
  "threat_severity" : "Important",
  "public_date" : "2023-07-06T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function",
    "id" : "2225097",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2225097"
  },
  "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-416",
  "details" : [ "A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation.\nIf tcf_change_indev() fails, fw_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability.\nWe recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f.", "A use-after-free vulnerability was found in fw_set_parms in net/sched/cls_fw.c in network scheduler sub-component in the Linux Kernel. This issue occurs due to a missing sanity check during cleanup at the time of failure, leading to a misleading reference. This may allow a local attacker to gain local privilege escalation." ],
  "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-2023:7419",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7",
    "package" : "kpatch-patch"
  }, {
    "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 7.6 Advanced Update Support(Disable again in 2026 - SPRHEL-7118)",
    "release_date" : "2023-11-15T00:00:00Z",
    "advisory" : "RHSA-2023:7294",
    "cpe" : "cpe:/o:redhat:rhel_aus:7.6",
    "package" : "kernel-0:3.10.0-957.108.1.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" : "2023-09-19T00:00:00Z",
    "advisory" : "RHSA-2023:5255",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8::nfv",
    "package" : "kernel-rt-0:4.18.0-477.27.1.rt7.290.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2023-09-19T00:00:00Z",
    "advisory" : "RHSA-2023:5221",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2023-09-19T00:00:00Z",
    "advisory" : "RHSA-2023:5244",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kernel-0:4.18.0-477.27.1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions",
    "release_date" : "2023-11-08T00:00:00Z",
    "advisory" : "RHSA-2023:6799",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.1",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions",
    "release_date" : "2023-11-08T00:00:00Z",
    "advisory" : "RHSA-2023:6813",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.1",
    "package" : "kernel-0:4.18.0-147.94.1.el8_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Advanced Update Support",
    "release_date" : "2023-11-21T00:00:00Z",
    "advisory" : "RHSA-2023:7434",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.2",
    "package" : "kernel-0:4.18.0-193.119.1.el8_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Telecommunications Update Service",
    "release_date" : "2023-11-21T00:00:00Z",
    "advisory" : "RHSA-2023:7431",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.2::nfv",
    "package" : "kernel-rt-0:4.18.0-193.119.1.rt13.170.el8_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Telecommunications Update Service",
    "release_date" : "2023-11-21T00:00:00Z",
    "advisory" : "RHSA-2023:7434",
    "cpe" : "cpe:/o:redhat:rhel_tus:8.2",
    "package" : "kernel-0:4.18.0-193.119.1.el8_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions",
    "release_date" : "2023-11-21T00:00:00Z",
    "advisory" : "RHSA-2023:7417",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.2",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions",
    "release_date" : "2023-11-21T00:00:00Z",
    "advisory" : "RHSA-2023:7434",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.2",
    "package" : "kernel-0:4.18.0-193.119.1.el8_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "release_date" : "2023-10-10T00:00:00Z",
    "advisory" : "RHSA-2023:5628",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.4",
    "package" : "kernel-0:4.18.0-305.108.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Telecommunications Update Service",
    "release_date" : "2023-10-17T00:00:00Z",
    "advisory" : "RHSA-2023:5794",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.4::nfv",
    "package" : "kernel-rt-0:4.18.0-305.108.1.rt7.183.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Telecommunications Update Service",
    "release_date" : "2023-10-10T00:00:00Z",
    "advisory" : "RHSA-2023:5628",
    "cpe" : "cpe:/o:redhat:rhel_tus:8.4",
    "package" : "kernel-0:4.18.0-305.108.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions",
    "release_date" : "2023-10-10T00:00:00Z",
    "advisory" : "RHSA-2023:5628",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.4",
    "package" : "kernel-0:4.18.0-305.108.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions",
    "release_date" : "2023-10-17T00:00:00Z",
    "advisory" : "RHSA-2023:5775",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.4",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Extended Update Support",
    "release_date" : "2023-11-21T00:00:00Z",
    "advisory" : "RHSA-2023:7398",
    "cpe" : "cpe:/o:redhat:rhel_eus:8.6",
    "package" : "kernel-0:4.18.0-372.80.1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Extended Update Support",
    "release_date" : "2023-11-21T00:00:00Z",
    "advisory" : "RHSA-2023:7410",
    "cpe" : "cpe:/o:redhat:rhel_eus:8.6",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2023-09-12T00:00:00Z",
    "advisory" : "RHSA-2023:5069",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-284.30.1.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2023-09-12T00:00:00Z",
    "advisory" : "RHSA-2023:5091",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9::nfv",
    "package" : "kernel-rt-0:5.14.0-284.30.1.rt14.315.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2023-09-12T00:00:00Z",
    "advisory" : "RHSA-2023:5069",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-284.30.1.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2023-09-12T00:00:00Z",
    "advisory" : "RHSA-2023:5093",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Extended Update Support",
    "release_date" : "2023-11-21T00:00:00Z",
    "advisory" : "RHSA-2023:7382",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.0",
    "package" : "kernel-0:5.14.0-70.80.1.el9_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Extended Update Support",
    "release_date" : "2023-11-21T00:00:00Z",
    "advisory" : "RHSA-2023:7389",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.0::nfv",
    "package" : "kernel-rt-0:5.14.0-70.80.1.rt21.151.el9_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Extended Update Support",
    "release_date" : "2023-11-21T00:00:00Z",
    "advisory" : "RHSA-2023:7411",
    "cpe" : "cpe:/o:redhat:rhel_eus:9.0",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8",
    "release_date" : "2023-11-21T00:00:00Z",
    "advisory" : "RHSA-2023:7398",
    "cpe" : "cpe:/o:redhat:rhev_hypervisor:4.4::el8",
    "package" : "kernel-0:4.18.0-372.80.1.el8_6"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2023-3776\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-3776\nhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=0323bce598eea038714f941ce2b22541c46d488f" ],
  "name" : "CVE-2023-3776",
  "mitigation" : {
    "value" : "To mitigate this issue, prevent module cls_fw from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.",
    "lang" : "en:us"
  },
  "csaw" : false
}