{
  "threat_severity" : "Moderate",
  "public_date" : "2026-03-25T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: ALSA: usb-audio: Use correct version for UAC3 header validation",
    "id" : "2451189",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2451189"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.6",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L",
    "status" : "draft"
  },
  "cwe" : "CWE-1287",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nALSA: usb-audio: Use correct version for UAC3 header validation\nThe entry of the validators table for UAC3 AC header descriptor is\ndefined with the wrong protocol version UAC_VERSION_2, while it should\nhave been UAC_VERSION_3.  This results in the validator never matching\nfor actual UAC3 devices (protocol == UAC_VERSION_3), causing their\nheader descriptors to bypass validation entirely.  A malicious USB\ndevice presenting a truncated UAC3 header could exploit this to cause\nout-of-bounds reads when the driver later accesses unvalidated\ndescriptor fields.\nThe bug was introduced in the same commit as the recently fixed UAC3\nfeature unit sub-type typo, and appears to be from the same copy-paste\nerror when the UAC3 section was created from the UAC2 section.", "A flaw was found in the Linux kernel's ALSA (Advanced Linux Sound Architecture) USB audio driver. A malicious USB Audio Class 3 (UAC3) device could exploit an incorrect protocol version used for UAC3 header validation. This error causes the device's header descriptors to bypass validation, allowing a truncated UAC3 header to trigger out-of-bounds reads when the driver processes unvalidated descriptor fields." ],
  "statement" : "This flaw affects systems with USB audio devices using UAC3 (USB Audio Class 3). A copy-paste error caused UAC3 header validation to use UAC_VERSION_2 instead of UAC_VERSION_3, completely bypassing validation for UAC3 devices. A malicious USB device could provide truncated descriptors to cause OOB reads. Physical access to connect the USB device is required.",
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "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" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-23318\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23318\nhttps://lore.kernel.org/linux-cve-announce/2026032530-CVE-2026-23318-bef0@gregkh/T" ],
  "name" : "CVE-2026-23318",
  "mitigation" : {
    "value" : "To mitigate this issue, prevent the snd_usb_audio module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.",
    "lang" : "en:us"
  },
  "csaw" : false
}