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CVE-2025-21704 (GCVE-0-2025-21704)

Vulnerability from cvelistv5 – Published: 2025-02-22 09:43 – Updated: 2026-05-12 12:03
VLAI
Title
usb: cdc-acm: Check control transfer buffer size before access
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: cdc-acm: Check control transfer buffer size before access If the first fragment is shorter than struct usb_cdc_notification, we can't calculate an expected_size. Log an error and discard the notification instead of reading lengths from memory outside the received data, which can lead to memory corruption when the expected_size decreases between fragments, causing `expected_size - acm->nb_index` to wrap. This issue has been present since the beginning of git history; however, it only leads to memory corruption since commit ea2583529cd1 ("cdc-acm: reassemble fragmented notifications"). A mitigating factor is that acm_ctrl_irq() can only execute after userspace has opened /dev/ttyACM*; but if ModemManager is running, ModemManager will do that automatically depending on the USB device's vendor/product IDs and its other interfaces.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 90dd2f1b7342b9a671a5ea4160f408037b92b118 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 871619c2b78fdfe05afb4e8ba548678687beb812 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7828e9363ac4d23b02419bf2a45b9f1d9fb35646 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6abb510251e75f875797d8983a830e6731fa281c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f64079bef6a8a7823358c3f352ea29a617844636 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 383d516a0ebc8641372b521c8cb717f0f1834831 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e563b01208f4d1f609bcab13333b6c0e24ce6a01 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.129 , ≤ 6.1.* (semver)
Unaffected: 6.6.79 , ≤ 6.6.* (semver)
Unaffected: 6.12.16 , ≤ 6.12.* (semver)
Unaffected: 6.13.4 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
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Tracking\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T23:55:33+00:00",
      "cve": "CVE-2025-21704",
      "id": "CVE-2025-21704",
      "initial_release_date": "2025-02-22T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: usb: cdc-acm: Memory corruption due to improper buffer size check",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21704.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





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

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.