CVE-2026-98186
Low risk· EPSS 8%Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
In the mwifiex driver in the Linux kernel, the function mwifiex_search_oui_in_ie() reads a pairwise-cipher (PTK) count from a beacon/probe-response RSN or WPA information element and then walks that many 4-byte OUIs, comparing each with memcmp(). The count comes directly from the attacker-supplied IE and is never checked against the element's length, allowing an out-of-bounds read. The fix bounds the walk to the element length.
Risk Assessment
A malicious access point can send a crafted RSN/WPA IE with a large pairwise count, causing an out-of-bounds read in the kernel during scan-result parsing. This can lead to information disclosure or system crash.
Recommendation
Apply the Linux kernel update containing the fix for CVE-2026-98186. Ensure systems with mwifiex devices are updated.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: bound the pairwise-cipher OUI walk to the IE length mwifiex_search_oui_in_ie() reads a pairwise-cipher (PTK) count from a beacon/probe-response RSN or WPA information element and then walks that many 4-byte OUIs, comparing each with memcmp(). The count comes straight from the (attacker-supplied) IE and is never checked against the element's own length, and the callers admit the element on element_id alone (has_ieee_hdr() / has_vendor_hdr(), no length check). A crafted RSN/WPA IE with a large pairwise count therefore makes the walk read up to 255 * 4 bytes past the element -- an out-of-bounds read of the kmemdup()'d beacon buffer, reachable from any AP whose beacon/probe response is processed during scan-result parsing. Pass the number of IE bytes available at the OUI list and bound the walk to the element. Keep the length signed and reject a negative value before any unsigned arithmetic, so a small or zero IE length cannot underflow to a large size_t and defeat the bound. Found by 0sec automated security-research tooling (https://0sec.ai).
Vulnerability data from NVD (NIST) · CISA KEV · EPSS