GHSA-G36P-Q7H2-H3PP

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp

If dcid is received for an already-assigned destination CID the spec requires that both channels to be discarded, but calling l2cap_chan_del may invalidate the tmp cursor created by list_for_each_entry_safe and in fact it is the wrong procedure as the chan->dcid may be assigned previously it really needs to be disconnected.

Calling l2cap_chan_clone directly may still lead to l2cap_chan_del so instead schedule l2cap_chan_timeout with delay 0 to close the channel asynchronously.

Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-63975"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:16Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp\n\nIf dcid is received for an already-assigned destination CID the spec\nrequires that both channels to be discarded, but calling l2cap_chan_del\nmay invalidate the tmp cursor created by list_for_each_entry_safe and\nin fact it is the wrong procedure as the chan-\u003edcid may be assigned\npreviously it really needs to be disconnected.\n\nCalling l2cap_chan_clone directly may still lead to l2cap_chan_del so\ninstead schedule l2cap_chan_timeout with delay 0 to close the channel\nasynchronously.",
  "id": "GHSA-g36p-q7h2-h3pp",
  "modified": "2026-07-20T15:31:53Z",
  "published": "2026-07-19T18:31:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63975"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/291eec1041c918c460dc9702e44edd17794b4a4b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c8eaa91eb433c450426539290be4ffe282e9f00"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41c2713b204e6cb6a94587bc6bf6935107df5479"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41e29548b5e8b5e5fcf708786b3bea67cab107fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6319b38fe69f56ed95680ade485b957a53fff642"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d153b8898c0051eb8b6a083b35cbe304a5886bd5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e6833e737a51db1e5ea0401322acf5e22abd8be6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ecfed1e0d8efecad6737a0d83e21d2fd021d8c48"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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