{"id":"CVE-2026-68326","title":"wifi: mwifiex: bound uAP association event IEs to the event buffer","summary":"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 …","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= e568634ae7ac379661c90731d480e067929420a1 < a616616b938f7922a93e79bef16b4643c57c0922","Linux >= e568634ae7ac379661c90731d480e067929420a1 < 1ae00b6d9a6c82eb3de151d9b04ed59e06cc100f","Linux >= e568634ae7ac379661c90731d480e067929420a1 < e7e93d3e8c240bdb70c41e79d169d74dfb442843","Linux >= e568634ae7ac379661c90731d480e067929420a1 < a3f47d7c75ddad1a14621a309286f9fae3cba191","Linux >= e568634ae7ac379661c90731d480e067929420a1 < ad26c75ae25749313248f06510ebe43b5bf4adcc","Linux >= e568634ae7ac379661c90731d480e067929420a1 < d21464d93f8ba464dc3d7b4b31c6e0adcd9f659c","Linux >= e568634ae7ac379661c90731d480e067929420a1 < b6766d7ea43edf5de9d5a572bc58b631d09efe4b","Linux >= e568634ae7ac379661c90731d480e067929420a1 < f0858bfc7d3cab411a447b88e3ef970e575032c9","Linux 3.5"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:47:09.561377Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:08.212Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68326","references":[{"url":"https://git.kernel.org/stable/c/a616616b938f7922a93e79bef16b4643c57c0922"},{"url":"https://git.kernel.org/stable/c/1ae00b6d9a6c82eb3de151d9b04ed59e06cc100f"},{"url":"https://git.kernel.org/stable/c/e7e93d3e8c240bdb70c41e79d169d74dfb442843"},{"url":"https://git.kernel.org/stable/c/a3f47d7c75ddad1a14621a309286f9fae3cba191"},{"url":"https://git.kernel.org/stable/c/ad26c75ae25749313248f06510ebe43b5bf4adcc"},{"url":"https://git.kernel.org/stable/c/d21464d93f8ba464dc3d7b4b31c6e0adcd9f659c"},{"url":"https://git.kernel.org/stable/c/b6766d7ea43edf5de9d5a572bc58b631d09efe4b"},{"url":"https://git.kernel.org/stable/c/f0858bfc7d3cab411a447b88e3ef970e575032c9"}],"tags":["cve.org"],"epss":0.00262,"epssPercentile":0.1684,"ingestedAt":"2026-10-16T17:24:46.857Z","slug":"CVE-2026-68326","body":"## Overview\n\nIn 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\").\n\n## Affected\n\n- `Linux >= e568634ae7ac379661c90731d480e067929420a1 < a616616b938f7922a93e79bef16b4643c57c0922`\n- `Linux >= e568634ae7ac379661c90731d480e067929420a1 < 1ae00b6d9a6c82eb3de151d9b04ed59e06cc100f`\n- `Linux >= e568634ae7ac379661c90731d480e067929420a1 < e7e93d3e8c240bdb70c41e79d169d74dfb442843`\n- `Linux >= e568634ae7ac379661c90731d480e067929420a1 < a3f47d7c75ddad1a14621a309286f9fae3cba191`\n- `Linux >= e568634ae7ac379661c90731d480e067929420a1 < ad26c75ae25749313248f06510ebe43b5bf4adcc`\n- `Linux >= e568634ae7ac379661c90731d480e067929420a1 < d21464d93f8ba464dc3d7b4b31c6e0adcd9f659c`\n- `Linux >= e568634ae7ac379661c90731d480e067929420a1 < b6766d7ea43edf5de9d5a572bc58b631d09efe4b`\n- `Linux >= e568634ae7ac379661c90731d480e067929420a1 < f0858bfc7d3cab411a447b88e3ef970e575032c9`\n- `Linux 3.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}