{
  "threat_severity" : "Moderate",
  "public_date" : "2026-02-14T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: ALSA: usb-audio: Prevent excessive number of frames",
    "id" : "2439906",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2439906"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-805",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nALSA: usb-audio: Prevent excessive number of frames\nIn this case, the user constructed the parameters with maxpacksize 40\nfor rate 22050 / pps 1000, and packsize[0] 22 packsize[1] 23. The buffer\nsize for each data URB is maxpacksize * packets, which in this example\nis 40 * 6 = 240; When the user performs a write operation to send audio\ndata into the ALSA PCM playback stream, the calculated number of frames\nis packsize[0] * packets = 264, which exceeds the allocated URB buffer\nsize, triggering the out-of-bounds (OOB) issue reported by syzbot [1].\nAdded a check for the number of single data URB frames when calculating\nthe number of frames to prevent [1].\n[1]\nBUG: KASAN: slab-out-of-bounds in copy_to_urb+0x261/0x460 sound/usb/pcm.c:1487\nWrite of size 264 at addr ffff88804337e800 by task syz.0.17/5506\nCall Trace:\ncopy_to_urb+0x261/0x460 sound/usb/pcm.c:1487\nprepare_playback_urb+0x953/0x13d0 sound/usb/pcm.c:1611\nprepare_outbound_urb+0x377/0xc50 sound/usb/endpoint.c:333", "A heap buffer overflow vulnerability was found in the USB audio driver. When user-supplied audio parameters result in a frame count larger than the allocated URB buffer size, the copy_to_urb() function writes beyond the buffer boundary, causing an out-of-bounds write." ],
  "statement" : "Exploitation requires the ability to configure USB audio device parameters, which typically needs access to the audio device. A malicious local user could potentially craft parameters to trigger the overflow. The OOB write could lead to kernel memory corruption or crash.",
  "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" : "Under investigation",
    "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-2026-23208\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23208\nhttps://lore.kernel.org/linux-cve-announce/2026021439-CVE-2026-23208-cc9e@gregkh/T" ],
  "name" : "CVE-2026-23208",
  "csaw" : false
}