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Improper Handling of Length Parameter Inconsistency The advisory has been revoked - it doesn't affect any version of package rtla  (opens in a new tab)

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EPSS
0.34% (27th percentile)

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  • Snyk IDSNYK-RHEL9-RTLA-9126767
  • published5 Mar 2025
  • disclosed22 Feb 2025
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Introduced: 22 Feb 2025

CVE-2025-21704  (opens in a new tab)
CWE-130  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:9.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rtla package and not the rtla package as distributed by RHEL.

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.

References