CVE-2021-47251

A flaw was found in the mac80211 subsystem of the Linux kernel. This vulnerability may allow a local user to cause a Denial of Service (DoS) by crashing the operating system. The issue occurs due to an incorrect packet header length check in the scan receive function (ieee80211_scan_rx), which relies on fixed compile-time constants rather than evaluating the frame type dynamically. Processing an unexpected frame triggers an internal kernel validation failure, resulting in system instability.

Red Hat has stack protection mechanisms in place, such as FORTIFY_SOURCE, Position Independent Executables or Stack Smashing Protection.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.