CVE-2025-38448 (GCVE-0-2025-38448)

Vulnerability from cvelistv5 – Published: 2025-07-25 15:27 – Updated: 2026-05-11 21:28
VLAI
Title
usb: gadget: u_serial: Fix race condition in TTY wakeup
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
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2 , < 18d58a467ccf011078352d91b4d6a0108c7318e8 (git)
Affected: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2 , < d43657b59f36e88289a6066f15bc9a80df5014eb (git)
Affected: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2 , < a5012673d49788f16bb4e375b002d7743eb642d9 (git)
Affected: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2 , < ee8d688e2ba558f3bb8ac225113740be5f335417 (git)
Affected: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2 , < c6eb4a05af3d0ba3bc4e8159287722fb9abc6359 (git)
Affected: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2 , < abf3620cba68e0e51e5c21054ce4f925f75b3661 (git)
Affected: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2 , < c8c80a3a35c2e3488409de2d5376ef7e662a2bf5 (git)
Affected: 35f95fd7f234d2b58803bab6f6ebd6bb988050a2 , < c529c3730bd09115684644e26bf01ecbd7e2c2c9 (git)
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Linux Linux Affected: 3.5
Unaffected: 0 , < 3.5 (semver)
Unaffected: 5.4.296 , ≤ 5.4.* (semver)
Unaffected: 5.10.240 , ≤ 5.10.* (semver)
Unaffected: 5.15.189 , ≤ 5.15.* (semver)
Unaffected: 6.1.146 , ≤ 6.1.* (semver)
Unaffected: 6.6.99 , ≤ 6.6.* (semver)
Unaffected: 6.12.39 , ≤ 6.12.* (semver)
Unaffected: 6.15.7 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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          {
            "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"
          }
        ],
        "id": "CVE-2025-38448",
        "lastModified": "2026-06-17T09:16:52.590",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 4.7,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-07-25T16:15:30.317",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/18d58a467ccf011078352d91b4d6a0108c7318e8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a5012673d49788f16bb4e375b002d7743eb642d9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/abf3620cba68e0e51e5c21054ce4f925f75b3661"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c529c3730bd09115684644e26bf01ecbd7e2c2c9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c6eb4a05af3d0ba3bc4e8159287722fb9abc6359"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c8c80a3a35c2e3488409de2d5376ef7e662a2bf5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d43657b59f36e88289a6066f15bc9a80df5014eb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ee8d688e2ba558f3bb8ac225113740be5f335417"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-362"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T01:08:26+00:00",
      "cve": "CVE-2025-38448",
      "id": "CVE-2025-38448",
      "initial_release_date": "2025-07-25T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: gadget: u_serial: Fix race condition in TTY wakeup",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38448.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.