{
  "threat_severity" : "Moderate",
  "public_date" : "2026-04-06T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold",
    "id" : "2455334",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2455334"
  },
  "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" : "draft"
  },
  "cwe" : "CWE-911",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nBluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold\nsco_recv_frame() reads conn->sk under sco_conn_lock() but immediately\nreleases the lock without holding a reference to the socket. A concurrent\nclose() can free the socket between the lock release and the subsequent\nsk->sk_state access, resulting in a use-after-free.\nOther functions in the same file (sco_sock_timeout(), sco_conn_del())\ncorrectly use sco_sock_hold() to safely hold a reference under the lock.\nFix by using sco_sock_hold() to take a reference before releasing the\nlock, and adding sock_put() on all exit paths.", "A flaw was found in the Linux kernel's Bluetooth SCO (Synchronous Connection-Oriented) protocol implementation. The `sco_recv_frame()` function fails to properly hold a reference to a socket after releasing a lock. This oversight allows a concurrent operation to free the socket while it is still being accessed, leading to a use-after-free vulnerability. A local attacker could potentially exploit this to cause memory corruption or a denial of service." ],
  "statement" : "Under `sco_conn_lock`, the code read `conn->sk` then dropped the lock without `sco_sock_hold()`, so `close()` could race and free the socket before `sk->sk_state` use. The fix mirrors other SCO helpers. Adjacent Bluetooth is involved; impact is UAF and likely crash.",
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "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",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "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-2026-31408\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31408\nhttps://lore.kernel.org/linux-cve-announce/2026040629-CVE-2026-31408-9f0f@gregkh/T" ],
  "name" : "CVE-2026-31408",
  "csaw" : false
}