wifi: mwifiex: bound uAP association event IEs to the event buffer

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68326
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:22 UTC
Updated2026-08-10 13:20:22 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: bound uAP association event IEs to the event buffer mwifiex_process_uap_event() handles EVENT_UAP_STA_ASSOC by exposing the (re)association request IEs that the firmware copies into the event: sinfo->assoc_req_ies = &event->data[len]; len = (u8 *)sinfo->assoc_req_ies - (u8 *)&event->frame_control; sinfo->assoc_req_ies_len = le16_to_cpu(event->len) - (u16)len; event->len is supplied by the device firmware and is never validated, and the subtraction is unchecked. assoc_req_ies points into adapter->event_body[MAX_EVENT_SIZE], a fixed-size array embedded in the kmalloc()'d struct mwifiex_adapter. On the ap_11n_enabled path mwifiex_set_sta_ht_cap() walks these IEs with cfg80211_find_ie(), whose for_each_element() loop dereferences each element header. A firmware-reported event->len larger than the bytes actually received makes assoc_req_ies_len describe IEs that extend past event_body, so the walk reads out of the adapter slab object, a slab-out-of-bounds read (KASAN: slab-out-of-bounds in cfg80211_find_ie). An event->len smaller than the header instead makes the int subtraction negative, which wraps to a huge size_t when stored in assoc_req_ies_len. The same length is handed to cfg80211_new_sta(), so a more modest over-claim can also copy stale event_body bytes into the NL80211_CMD_NEW_STATION notification. A malicious or malfunctioning mwifiex device (USB/SDIO/PCIe) can deliver such an event while the interface is in AP/uAP mode. Validate event->len before use: reject a length that underflows the header or that would place the IEs outside the event_body[] buffer the event was copied into. event->len here is struct mwifiex_assoc_event.len, a payload field internal to this event, not the transport frame length, so it is validated in this handler rather than at the generic MWIFIEX_TYPE_EVENT receive path, which only sees the event cause and the transport frame length. The bound is against event_body[MAX_EVENT_SIZE] rather than the actually-received length because the transports store the event differently (USB and SDIO leave the 4-byte event header in event_skb, PCIe strips it via skb_pull), whereas event_body is the single fixed buffer all of them copy the event into. This is the event-path analogue of the receive-path bounds checks added in commit 119585281617 ("wifi: mwifiex: Fix OOB and integer underflow when rx packets").

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e568634ae7ac379661c90731d480e067929420a1 a3f47d7c75ddad1a14621a309286f9fae3cba191 git Not specified
CNA Linux Linux affected e568634ae7ac379661c90731d480e067929420a1 ad26c75ae25749313248f06510ebe43b5bf4adcc git Not specified
CNA Linux Linux affected e568634ae7ac379661c90731d480e067929420a1 d21464d93f8ba464dc3d7b4b31c6e0adcd9f659c git Not specified
CNA Linux Linux affected e568634ae7ac379661c90731d480e067929420a1 b6766d7ea43edf5de9d5a572bc58b631d09efe4b git Not specified
CNA Linux Linux affected e568634ae7ac379661c90731d480e067929420a1 f0858bfc7d3cab411a447b88e3ef970e575032c9 git Not specified
CNA Linux Linux affected 3.5 Not specified
CNA Linux Linux unaffected 3.5 semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ad26c75ae25749313248f06510ebe43b5bf4adcc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d21464d93f8ba464dc3d7b4b31c6e0adcd9f659c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f0858bfc7d3cab411a447b88e3ef970e575032c9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b6766d7ea43edf5de9d5a572bc58b631d09efe4b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a3f47d7c75ddad1a14621a309286f9fae3cba191 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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