CVE-2025-21704

Advisory lineage Upstream: 0 Downstream: 61
Modified
Published: 22 Feb 2025, 09:43
Last modified:12 May 2026, 12:03

Vulnerability Summary

Overall Risk (default)
medium
41/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
0.03% LOW
0% probability -0.01%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

22 Feb 2025, 09:43
Published
Vulnerability first disclosed
12 May 2026, 12:03
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.03%• Percentile: 7%

Techniques & Countermeasures

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • linux•linux

    ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 90dd2f1b7342b9a671a5ea4160f408037b92b118 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 871619c2b78fdfe05afb4e8ba548678687beb812 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7828e9363ac4d23b02419bf2a45b9f1d9fb35646 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6abb510251e75f875797d8983a830e6731fa281c | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f64079bef6a8a7823358c3f352ea29a617844636 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 383d516a0ebc8641372b521c8cb717f0f1834831 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e563b01208f4d1f609bcab13333b6c0e24ce6a01 | 2.6.12

  • linux•linux_kernel

    ≥ 2.6.13, < 5.4.291 | ≥ 5.5, < 5.10.235 | ≥ 5.11, < 5.15.179 | ≥ 5.16, < 6.1.129 | ≥ 6.2, < 6.6.79 | ≥ 6.7, < 6.12.16 | ≥ 6.13, < 6.13.4 | 2.6.12 | 2.6.12:rc2 | 2.6.12:rc3 | 2.6.12:rc4 | 2.6.12:rc5 | 6.14:rc1 | 6.14:rc2

References (12)