{"cve":"CVE-2026-68326","nvd":{"published":"2026-08-10T13:20:22.783","modified":"2026-10-19T22:17:13.360","status":"Received","description":"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->assoc_req_ies = &event->data[len];\n\tlen = (u8 *)sinfo->assoc_req_ies - (u8 *)&event->frame_control;\n\tsinfo->assoc_req_ies_len = le16_to_cpu(event->len) - (u16)len;\n\nevent->len is supplied by the device firmware and is never validated,\nand the subtraction is unchecked.  assoc_req_ies points into\nadapter->event_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->len 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->len 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->len 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->len 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\").","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-125"],"references":["https://git.kernel.org/stable/c/1ae00b6d9a6c82eb3de151d9b04ed59e06cc100f","https://git.kernel.org/stable/c/a3f47d7c75ddad1a14621a309286f9fae3cba191","https://git.kernel.org/stable/c/a616616b938f7922a93e79bef16b4643c57c0922","https://git.kernel.org/stable/c/ad26c75ae25749313248f06510ebe43b5bf4adcc","https://git.kernel.org/stable/c/b6766d7ea43edf5de9d5a572bc58b631d09efe4b"],"products":[],"source":"nvd","synced_at":"2026-10-21T03:56:58.798400159+00:00"},"epss":{"cve":"CVE-2026-68326","score":0.00263,"percentile":0.17996,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}