{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68326", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.382Z", "datePublished": "2026-08-10T12:03:02.372Z", "dateUpdated": "2026-08-19T16:33:21.015Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:33:21.015Z" }, "descriptions": [ { "lang": "en", "value": "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\")." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The event payload is the firmware's rendering of an over-the-air (re)association request received by the mwifiex uAP interface, with event->len being the TLV length covering that frame, so the triggering input comes from a station within 802.11 radio range. This matches the Adjacent treatment used for other frame/event-driven mwifiex defects (CVE-2024-46755, CVE-2023-53226).\nAC:L - No race or attacker-uncontrollable state is involved: the attacker simply sends a crafted/oversized (re)association request to the AP, and the handler parses the resulting EVENT_UAP_STA_ASSOC unconditionally. The only precondition, an mwifiex interface in AP/uAP mode with ap_11n_enabled, is the normal steady state for tethering, Chromebook SoftAP and embedded AP deployments.\nPR:N - EVENT_UAP_STA_ASSOC is generated at association time, before the WPA/EAPOL handshake, so the attacker needs no credentials on or accepted association with the target host. No host user account or capability is involved anywhere on the path.\nUI:N - The event is consumed autonomously by mwifiex_process_uap_event() in the driver's main work handler as soon as the firmware delivers it; no local user or administrator action is required beyond the AP already running.\nS:U - The out-of-bounds read, the underflowed length and the resulting corruption are all confined to the host kernel's own security authority within the mwifiex/cfg80211 code; no hypervisor, IOMMU or sandbox boundary is crossed.\nC:H - An over-claimed event->len makes assoc_req_ies_len describe memory past adapter->event_body[MAX_EVENT_SIZE], producing a slab-out-of-bounds read in cfg80211_find_ie() and, worse, causing nla_put() to copy up to tens of kilobytes of adjacent kernel slab memory into the NL80211_CMD_NEW_STATION notification delivered to userspace — an unbounded kernel heap disclosure, not a few stray bytes.\nI:H - An event->len below the header makes the int subtraction negative and wrap in size_t; that value reaches nla_put(), where nla_total_size() of the negative length evaluates to 0 and passes the tailroom check, so __nla_put()'s memcpy() runs with the negative length widened to a huge size_t — an unbounded out-of-bounds write past the netlink skb. Driver 11n/AMSDU state is also set from out-of-bounds data.\nA:H - The commit documents a reproducible KASAN slab-out-of-bounds in cfg80211_find_ie, and the underflow path drives a memcpy of a near-2^64 length that guarantees an immediate kernel panic. The condition can be re-triggered at will by repeating the association attempt." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/wireless/marvell/mwifiex/uap_event.c" ], "versions": [ { "version": "e568634ae7ac379661c90731d480e067929420a1", "lessThan": "a616616b938f7922a93e79bef16b4643c57c0922", "status": "affected", "versionType": "git" }, { "version": "e568634ae7ac379661c90731d480e067929420a1", "lessThan": "1ae00b6d9a6c82eb3de151d9b04ed59e06cc100f", "status": "affected", "versionType": "git" }, { "version": "e568634ae7ac379661c90731d480e067929420a1", "lessThan": "e7e93d3e8c240bdb70c41e79d169d74dfb442843", "status": "affected", "versionType": "git" }, { "version": "e568634ae7ac379661c90731d480e067929420a1", "lessThan": "a3f47d7c75ddad1a14621a309286f9fae3cba191", "status": "affected", "versionType": "git" }, { "version": "e568634ae7ac379661c90731d480e067929420a1", "lessThan": "ad26c75ae25749313248f06510ebe43b5bf4adcc", "status": "affected", "versionType": "git" }, { "version": "e568634ae7ac379661c90731d480e067929420a1", "lessThan": "d21464d93f8ba464dc3d7b4b31c6e0adcd9f659c", "status": "affected", "versionType": "git" }, { "version": "e568634ae7ac379661c90731d480e067929420a1", "lessThan": "b6766d7ea43edf5de9d5a572bc58b631d09efe4b", "status": "affected", "versionType": "git" }, { "version": "e568634ae7ac379661c90731d480e067929420a1", "lessThan": "f0858bfc7d3cab411a447b88e3ef970e575032c9", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/wireless/marvell/mwifiex/uap_event.c" ], "versions": [ { "version": "3.5", "status": "affected" }, { "version": "0", "lessThan": "3.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "7.2" } ] } ] } ], "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" } ], "title": "wifi: mwifiex: bound uAP association event IEs to the event buffer", "x_generator": { "engine": "bippy-1.2.0" } } } }