CVE-2025-38448 (GCVE-0-2025-38448)
Vulnerability from cvelistv5
Published
2025-07-25 15:27
Modified
2025-07-28 04:22
Severity ?
Summary
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
References
Impacted products
Vendor Product Version
Linux Linux Version: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2
Version: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2
Version: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2
Version: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2
Version: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2
Version: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2
Version: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2
Version: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/u_serial.c"
          ],
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          "vendor": "Linux",
          "versions": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "3.5"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "version": "5.4.296",
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            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.240",
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            },
            {
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              "status": "unaffected",
              "version": "5.15.189",
              "versionType": "semver"
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              "lessThanOrEqual": "6.1.*",
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              "version": "6.1.146",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.99",
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              "status": "unaffected",
              "version": "6.12.39",
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              "version": "6.15.7",
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            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.296",
                  "versionStartIncluding": "3.5",
                  "vulnerable": true
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                  "vulnerable": true
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                  "versionEndExcluding": "5.15.189",
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                  "vulnerable": true
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                  "versionEndExcluding": "6.1.146",
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                {
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                  "versionEndExcluding": "6.16",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:22:33.351Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/18d58a467ccf011078352d91b4d6a0108c7318e8"
        },
        {
          "url": "https://git.kernel.org/stable/c/d43657b59f36e88289a6066f15bc9a80df5014eb"
        },
        {
          "url": "https://git.kernel.org/stable/c/a5012673d49788f16bb4e375b002d7743eb642d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee8d688e2ba558f3bb8ac225113740be5f335417"
        },
        {
          "url": "https://git.kernel.org/stable/c/c6eb4a05af3d0ba3bc4e8159287722fb9abc6359"
        },
        {
          "url": "https://git.kernel.org/stable/c/abf3620cba68e0e51e5c21054ce4f925f75b3661"
        },
        {
          "url": "https://git.kernel.org/stable/c/c8c80a3a35c2e3488409de2d5376ef7e662a2bf5"
        },
        {
          "url": "https://git.kernel.org/stable/c/c529c3730bd09115684644e26bf01ecbd7e2c2c9"
        }
      ],
      "title": "usb: gadget: u_serial: Fix race condition in TTY wakeup",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38448",
    "datePublished": "2025-07-25T15:27:30.040Z",
    "dateReserved": "2025-04-16T04:51:24.018Z",
    "dateUpdated": "2025-07-28T04:22:33.351Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38448\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-25T16:15:30.317\",\"lastModified\":\"2025-07-29T14:14:55.157\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: gadget: u_serial: Correcci\u00f3n de la condici\u00f3n de ejecuci\u00f3n en la activaci\u00f3n de TTY. Una condici\u00f3n de ejecuci\u00f3n ocurre cuando gs_start_io() llama a gs_start_rx() o gs_start_tx(), ya que estas funciones desactivan brevemente el port_lock para usb_ep_queue(). Esto permite que gs_close() y gserial_disconnect() borren port.tty y port_usb, respectivamente. Utilice la funci\u00f3n auxiliar de puerto TTY segura para nulos para activar TTY. Ejemplo CPU1: CPU2: gserial_connect() // bloquear gs_close() // esperar bloqueo gs_start_rx() // desbloquear usb_ep_queue() gs_close() // bloquear, restablecer port.tty y desbloquear gs_start_rx() // bloquear tty_wakeup() // NPE\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/18d58a467ccf011078352d91b4d6a0108c7318e8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a5012673d49788f16bb4e375b002d7743eb642d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/abf3620cba68e0e51e5c21054ce4f925f75b3661\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c529c3730bd09115684644e26bf01ecbd7e2c2c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c6eb4a05af3d0ba3bc4e8159287722fb9abc6359\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c8c80a3a35c2e3488409de2d5376ef7e662a2bf5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d43657b59f36e88289a6066f15bc9a80df5014eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee8d688e2ba558f3bb8ac225113740be5f335417\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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