{"id":"CVE-2026-68326","summary":"wifi: mwifiex: bound uAP association event IEs to the event buffer","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mwifiex: bound uAP association event IEs to the event buffer\n\nmwifiex_process_uap_event() handles EVENT_UAP_STA_ASSOC by exposing the\n(re)association request IEs that the firmware copies into the event:\n\n\tsinfo-\u003eassoc_req_ies = &event-\u003edata[len];\n\tlen = (u8 *)sinfo-\u003eassoc_req_ies - (u8 *)&event-\u003eframe_control;\n\tsinfo-\u003eassoc_req_ies_len = le16_to_cpu(event-\u003elen) - (u16)len;\n\nevent-\u003elen is supplied by the device firmware and is never validated,\nand the subtraction is unchecked.  assoc_req_ies points into\nadapter-\u003eevent_body[MAX_EVENT_SIZE], a fixed-size array embedded in the\nkmalloc()'d struct mwifiex_adapter.\n\nOn the ap_11n_enabled path mwifiex_set_sta_ht_cap() walks these IEs with\ncfg80211_find_ie(), whose for_each_element() loop dereferences each\nelement header.  A firmware-reported event-\u003elen larger than the bytes\nactually received makes assoc_req_ies_len describe IEs that extend past\nevent_body, so the walk reads out of the adapter slab object, a\nslab-out-of-bounds read (KASAN: slab-out-of-bounds in cfg80211_find_ie).\nAn event-\u003elen smaller than the header instead makes the int subtraction\nnegative, which wraps to a huge size_t when stored in assoc_req_ies_len.\nThe same length is handed to cfg80211_new_sta(), so a more modest\nover-claim can also copy stale event_body bytes into the\nNL80211_CMD_NEW_STATION notification.\n\nA malicious or malfunctioning mwifiex device (USB/SDIO/PCIe) can deliver\nsuch an event while the interface is in AP/uAP mode.\n\nValidate event-\u003elen before use: reject a length that underflows the\nheader or that would place the IEs outside the event_body[] buffer the\nevent was copied into.  event-\u003elen here is struct mwifiex_assoc_event.len,\na payload field internal to this event, not the transport frame length,\nso it is validated in this handler rather than at the generic\nMWIFIEX_TYPE_EVENT receive path, which only sees the event cause and the\ntransport frame length.  The bound is against event_body[MAX_EVENT_SIZE]\nrather than the actually-received length because the transports store the\nevent differently (USB and SDIO leave the 4-byte event header in\nevent_skb, PCIe strips it via skb_pull), whereas event_body is the single\nfixed buffer all of them copy the event into.  This is the event-path\nanalogue of the receive-path bounds checks added in commit 119585281617\n(\"wifi: mwifiex: Fix OOB and integer underflow when rx packets\").","modified":"2026-08-21T03:30:22.939726155Z","published":"2026-08-10T12:03:02.372Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68326.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1ae00b6d9a6c82eb3de151d9b04ed59e06cc100f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a3f47d7c75ddad1a14621a309286f9fae3cba191"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a616616b938f7922a93e79bef16b4643c57c0922"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ad26c75ae25749313248f06510ebe43b5bf4adcc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b6766d7ea43edf5de9d5a572bc58b631d09efe4b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d21464d93f8ba464dc3d7b4b31c6e0adcd9f659c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e7e93d3e8c240bdb70c41e79d169d74dfb442843"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f0858bfc7d3cab411a447b88e3ef970e575032c9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68326.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68326"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e568634ae7ac379661c90731d480e067929420a1"},{"fixed":"a616616b938f7922a93e79bef16b4643c57c0922"},{"fixed":"1ae00b6d9a6c82eb3de151d9b04ed59e06cc100f"},{"fixed":"e7e93d3e8c240bdb70c41e79d169d74dfb442843"},{"fixed":"a3f47d7c75ddad1a14621a309286f9fae3cba191"},{"fixed":"ad26c75ae25749313248f06510ebe43b5bf4adcc"},{"fixed":"d21464d93f8ba464dc3d7b4b31c6e0adcd9f659c"},{"fixed":"b6766d7ea43edf5de9d5a572bc58b631d09efe4b"},{"fixed":"f0858bfc7d3cab411a447b88e3ef970e575032c9"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68326.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.5.0"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68326.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}