GHSA-9G79-VCQ4-5RFR

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: ISO: fix UAF in iso_recv_frame

iso_recv_frame reads conn->sk under iso_conn_lock but releases the lock before using sk, with no reference held. A concurrent iso_sock_kill() can free sk in that window, causing use-after-free on sk->sk_state and sock_queue_rcv_skb().

Fix by replacing the bare pointer read with iso_sock_hold(conn), which calls sock_hold() while the spinlock is held, atomically elevating the refcount before the lock drops. Add a drop_put label so sock_put() is called on all exit paths where the hold succeeded.

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-2026-63946"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:13Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix UAF in iso_recv_frame\n\niso_recv_frame reads conn-\u003esk under iso_conn_lock but releases the lock\nbefore using sk, with no reference held. A concurrent iso_sock_kill()\ncan free sk in that window, causing use-after-free on sk-\u003esk_state and\nsock_queue_rcv_skb().\n\nFix by replacing the bare pointer read with iso_sock_hold(conn), which\ncalls sock_hold() while the spinlock is held, atomically elevating the\nrefcount before the lock drops. Add a drop_put label so sock_put() is\ncalled on all exit paths where the hold succeeded.",
  "id": "GHSA-9g79-vcq4-5rfr",
  "modified": "2026-07-20T15:31:53Z",
  "published": "2026-07-19T18:31:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63946"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/119fb6f80c44dc1c65d604cf28e64c56bd9b6568"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a6b803b00ccdd7666506adbe01ddae1c72d1ca9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47f23a259517abbdb8032c057a1e8a6bf3734878"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b04ec131325baf4ea4577d6c6e6b86cf092e3731"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c318aa51830a3d2cc1229968fe521441c97356cd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c57ea90f203c8b8b41a474f19a09000d0f841436"
    }
  ],
  "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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