GHSA-X2V9-P3X8-4HP5

Vulnerability from github – Published: 2025-07-25 18:30 – Updated: 2025-12-23 00:30
VLAI
Details

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

usb: gadget: u_serial: Fix race condition in TTY wakeup

A race condition occurs when gs_start_io() calls either gs_start_rx() or gs_start_tx(), as those functions briefly drop the port_lock for usb_ep_queue(). This allows gs_close() and gserial_disconnect() to clear port.tty and port_usb, respectively.

Use the null-safe TTY Port helper function to wake up TTY.

Example CPU1: CPU2: gserial_connect() // lock gs_close() // await lock gs_start_rx() // unlock usb_ep_queue() gs_close() // lock, reset port.tty and unlock gs_start_rx() // lock tty_wakeup() // NPE

Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-38448"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-25T16:15:30Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_serial: Fix race condition in TTY wakeup\n\nA race condition occurs when gs_start_io() calls either gs_start_rx() or\ngs_start_tx(), as those functions briefly drop the port_lock for\nusb_ep_queue(). This allows gs_close() and gserial_disconnect() to clear\nport.tty and port_usb, respectively.\n\nUse the null-safe TTY Port helper function to wake up TTY.\n\nExample\n  CPU1:\t\t\t      CPU2:\n  gserial_connect() // lock\n  \t\t\t      gs_close() // await lock\n  gs_start_rx()     // unlock\n  usb_ep_queue()\n  \t\t\t      gs_close() // lock, reset port.tty and unlock\n  gs_start_rx()     // lock\n  tty_wakeup()      // NPE",
  "id": "GHSA-x2v9-p3x8-4hp5",
  "modified": "2025-12-23T00:30:30Z",
  "published": "2025-07-25T18:30:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38448"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18d58a467ccf011078352d91b4d6a0108c7318e8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a5012673d49788f16bb4e375b002d7743eb642d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/abf3620cba68e0e51e5c21054ce4f925f75b3661"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c529c3730bd09115684644e26bf01ecbd7e2c2c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c6eb4a05af3d0ba3bc4e8159287722fb9abc6359"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c8c80a3a35c2e3488409de2d5376ef7e662a2bf5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d43657b59f36e88289a6066f15bc9a80df5014eb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ee8d688e2ba558f3bb8ac225113740be5f335417"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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