{
  "threat_severity" : "Moderate",
  "public_date" : "2026-04-22T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()",
    "id" : "2460692",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2460692"
  },
  "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-833",
  "details" : [ "A flaw was found in the Linux kernel's Bluetooth L2CAP component. A deadlock can occur in the `l2cap_conn_del()` function when canceling delayed work, specifically `info_timer` and `id_addr_timer`. This happens because `l2cap_conn_del()` holds a lock while attempting to cancel work functions that also acquire the same lock, creating a circular waiting condition. This concurrency issue can lead to a Denial of Service (DoS), making the system unresponsive." ],
  "statement" : "Red Hat acknowledges the AB-BA deadlock between `conn->lock` and delayed work cancellation fixed by reordering to `disable_delayed_work_sync()` before taking the lock. Impact is availability for systems actively tearing down L2CAP connections. Patch via kernel errata; Bluetooth unload remains an operational workaround.",
  "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" : "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",
    "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-2026-31499\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31499\nhttps://lore.kernel.org/linux-cve-announce/2026042204-CVE-2026-31499-0142@gregkh/T" ],
  "name" : "CVE-2026-31499",
  "mitigation" : {
    "value" : "To mitigate this issue, prevent the bluetooth module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.",
    "lang" : "en:us"
  },
  "csaw" : false
}