CVE-2026-98186: Linux Vulnerability

Description

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).

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e, < 77e642af7f2f6029e12a35c847c56cbd0466e799; >= 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e, < 982b8fcdbb28f63bbbf02f0822c0bbda12ec27ed; >= 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e, < 58767b41f87244eebaa5a475b9d276c83b89b933; >= 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e, < 2402c9e2644b7e10c7aaaf87bf12743d7e363559; >= 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e, < 54a9cc5bd70b0d77a5069d4c46998c679a10c857; >= 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e, < 8bbef2b1ebfbadc0b9c37bbbf9c9e26fe2e41960; >= 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e, < 46cda9d42f0d6ec3057d878ddb1f38c0ab9f51df; >= 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e, < e667aee1c192d67d27c803007bfa9c6e0873e959
Linux	Linux	3.0

References

Timeline

Published: Oct 6, 2026
Last Modified: Oct 6, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-98186?

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).

How severe is CVE-2026-98186?

Severity scoring for CVE-2026-98186 is pending analysis.

How do I fix CVE-2026-98186?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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