{"id":"CVE-2026-98186","summary":"wifi: mwifiex: bound the pairwise-cipher OUI walk to the IE length","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mwifiex: bound the pairwise-cipher OUI walk to the IE length\n\nmwifiex_search_oui_in_ie() reads a pairwise-cipher (PTK) count from a\nbeacon/probe-response RSN or WPA information element and then walks that\nmany 4-byte OUIs, comparing each with memcmp(). The count comes straight\nfrom the (attacker-supplied) IE and is never checked against the\nelement's own length, and the callers admit the element on element_id\nalone (has_ieee_hdr() / has_vendor_hdr(), no length check). A crafted\nRSN/WPA IE with a large pairwise count therefore makes the walk read up\nto 255 * 4 bytes past the element -- an out-of-bounds read of the\nkmemdup()'d beacon buffer, reachable from any AP whose beacon/probe\nresponse is processed during scan-result parsing.\n\nPass the number of IE bytes available at the OUI list and bound the walk\nto the element. Keep the length signed and reject a negative value\nbefore any unsigned arithmetic, so a small or zero IE length cannot\nunderflow to a large size_t and defeat the bound.\n\nFound by 0sec automated security-research tooling (https://0sec.ai).","modified":"2026-10-07T02:47:32.150473203Z","published":"2026-10-06T08:44:28.429Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98186.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2402c9e2644b7e10c7aaaf87bf12743d7e363559"},{"type":"WEB","url":"https://git.kernel.org/stable/c/46cda9d42f0d6ec3057d878ddb1f38c0ab9f51df"},{"type":"WEB","url":"https://git.kernel.org/stable/c/54a9cc5bd70b0d77a5069d4c46998c679a10c857"},{"type":"WEB","url":"https://git.kernel.org/stable/c/58767b41f87244eebaa5a475b9d276c83b89b933"},{"type":"WEB","url":"https://git.kernel.org/stable/c/77e642af7f2f6029e12a35c847c56cbd0466e799"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8bbef2b1ebfbadc0b9c37bbbf9c9e26fe2e41960"},{"type":"WEB","url":"https://git.kernel.org/stable/c/982b8fcdbb28f63bbbf02f0822c0bbda12ec27ed"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e667aee1c192d67d27c803007bfa9c6e0873e959"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98186.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98186"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e"},{"fixed":"77e642af7f2f6029e12a35c847c56cbd0466e799"},{"fixed":"982b8fcdbb28f63bbbf02f0822c0bbda12ec27ed"},{"fixed":"58767b41f87244eebaa5a475b9d276c83b89b933"},{"fixed":"2402c9e2644b7e10c7aaaf87bf12743d7e363559"},{"fixed":"54a9cc5bd70b0d77a5069d4c46998c679a10c857"},{"fixed":"8bbef2b1ebfbadc0b9c37bbbf9c9e26fe2e41960"},{"fixed":"46cda9d42f0d6ec3057d878ddb1f38c0ab9f51df"},{"fixed":"e667aee1c192d67d27c803007bfa9c6e0873e959"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98186.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"5.10.271"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.222"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.189"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.54"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98186.json"}}],"schema_version":"1.9.0"}