{
  "threat_severity" : "Moderate",
  "public_date" : "2026-01-25T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: macvlan: fix possible UAF in macvlan_forward_source()",
    "id" : "2432664",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2432664"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.8",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-416",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nmacvlan: fix possible UAF in macvlan_forward_source()\nAdd RCU protection on (struct macvlan_source_entry)->vlan.\nWhenever macvlan_hash_del_source() is called, we must clear\nentry->vlan pointer before RCU grace period starts.\nThis allows macvlan_forward_source() to skip over\nentries queued for freeing.\nNote that macvlan_dev are already RCU protected, as they\nare embedded in a standard netdev (netdev_priv(ndev)).\nhttps: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u" ],
  "statement" : "A use-after-free can occur in macvlan source-mode forwarding when a source hash entry is deleted while the transmit/forwarding path still dereferences entry.vlan without proper RCU protection. A local attacker who can configure macvlan networking can race deletion with packet processing to crash the kernel and potentially achieve memory corruption.\nExploitation typically requires the CAP_NET_ADMIN capability (often within a user namespace).",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-03-09T00:00:00Z",
    "advisory" : "RHSA-2026:4012",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.1",
    "package" : "kernel-0:6.12.0-124.43.1.el10_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-03-09T00:00:00Z",
    "advisory" : "RHSA-2026:3964",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8::nfv",
    "package" : "kernel-rt-0:4.18.0-553.111.1.rt7.452.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-03-09T00:00:00Z",
    "advisory" : "RHSA-2026:3963",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kernel-0:4.18.0-553.111.1.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-03-09T00:00:00Z",
    "advisory" : "RHSA-2026:3966",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-611.38.1.el9_7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-03-09T00:00:00Z",
    "advisory" : "RHSA-2026:3966",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-611.38.1.el9_7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Extended Update Support",
    "release_date" : "2026-04-01T00:00:00Z",
    "advisory" : "RHSA-2026:6310",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.4",
    "package" : "kernel-0:5.14.0-427.117.1.el9_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-03-23T00:00:00Z",
    "advisory" : "RHSA-2026:5197",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "kernel-0:5.14.0-570.100.1.el9_6"
  } ],
  "package_state" : [ {
    "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 Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-23001\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23001\nhttps://lore.kernel.org/linux-cve-announce/2026012534-CVE-2026-23001-7ab0@gregkh/T" ],
  "name" : "CVE-2026-23001",
  "mitigation" : {
    "value" : "To mitigate this issue, prevent module macvlan 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
}