CVE-2025-37973

In the Linux kernel, the following vulnerability has been resolved:

wifi: cfg80211: fix out-of-bounds access during multi-link element defragmentation

Currently during the multi-link element defragmentation process, the multi-link element length added to the total IEs length when calculating the length of remaining IEs after the multi-link element in cfg80211_defrag_mle(). This could lead to out-of-bounds access if the multi-link element or its corresponding fragment elements are the last elements in the IEs buffer.

To address this issue, correctly calculate the remaining IEs length by deducting the multi-link element end offset from total IEs end offset.

A flaw was found in the Linux kernel's cfg80211_defrag_mle() function, where an incorrect calculation of the remaining IEs length could lead to an out-of-bounds memory access during multi-link element (MLE) defragmentation. A malicious beacon or probe response frame containing fragmented MLEs could potentially trigger this issue. This flaw is exploitable in setups where userspace or firmware passes raw Wi-Fi frames to the kernel for parsing (e.g., via softmac drivers), but requires attacker-controlled wireless traffic and a vulnerable parsing path.

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.