{
  "threat_severity" : "Moderate",
  "public_date" : "2026-02-04T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: wifi: mac80211_hwsim: fix typo in frequency notification",
    "id" : "2436806",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2436806"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.6",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-476",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nwifi: mac80211_hwsim: fix typo in frequency notification\nThe NAN notification is for 5745 MHz which corresponds to channel 149\nand not 5475 which is not actually a valid channel. This could result in\na NULL pointer dereference in cfg80211_next_nan_dw_notif." ],
  "statement" : "The mac80211_hwsim virtual WiFi driver contains an incorrect frequency constant used when generating NAN discovery window notifications on the 5 GHz band that can lead to Null pointer deref. In mac80211_hwsim_nan_dw_start the driver calls ieee80211_get_channel with 5475 MHz when nan_curr_dw_band is NL80211_BAND_5GHZ. That frequency does not correspond to a valid channel in typical wiphy channel tables so ieee80211_get_channel may return NULL. Subsequent NAN notification processing in cfg80211 may then dereference the channel pointer and crash the kernel in cfg80211_next_nan_dw_notif leading to a denial of service. The issue is most relevant in test and simulation environments where mac80211_hwsim is loaded and NAN simulation is enabled. A local attacker with permissions to configure wireless interfaces and NAN behavior can trigger the faulty path by enabling NAN simulation and causing 5 GHz NAN discovery window scheduling.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-05-19T00:00:00Z",
    "advisory" : "RHSA-2026:18134",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.2",
    "package" : "kernel-0:6.12.0-211.7.1.el10_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-05-19T00:00:00Z",
    "advisory" : "RHSA-2026:18587",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-687.5.1.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-05-19T00:00:00Z",
    "advisory" : "RHSA-2026:18587",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-687.5.1.el9_8"
  } ],
  "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 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "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-2026-23040\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23040\nhttps://lore.kernel.org/linux-cve-announce/2026020438-CVE-2026-23040-1980@gregkh/T" ],
  "name" : "CVE-2026-23040",
  "mitigation" : {
    "value" : "To mitigate this issue, prevent module mac80211_hwsim 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
}