wifi: mwifiex: prevent authentication frame length truncation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98184
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 09:18:03 UTC
Updated2026-10-06 09:18:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: prevent authentication frame length truncation mwifiex_cfg80211_authenticate() derives the authentication frame length from req->ie_len and req->auth_data_len, both of type size_t, but stores it in a u16. NL80211_ATTR_AUTH_DATA only has a minimum length policy. Since nla_len is a u16, a single attribute can carry up to 65531 bytes of payload, so the sum can exceed U16_MAX before it is assigned to pkt_len. The truncated pkt_len determines the skb frame area, while the copy length remains req->auth_data_len - 4, resulting in a heap buffer overflow. For example, with auth_data_len equal to 65510 and no IEs, the sum is 65546. It is truncated to 10 and then reduced by four to 6. The driver appends only six bytes to the skb with skb_put(), but then copies 65506 user-provided bytes into the authentication body. Reaching this path requires CAP_NET_ADMIN in the user namespace owning the network namespace, an up station netdev, and a suitable BSS/SAE authentication request. Compute the length in size_t, reject values that cannot be represented by the firmware's u16 frame length field, and only then assign it to pkt_len.

Risk And Classification

EPSS: 0.002710000 probability, percentile 0.176260000 (date 2026-10-06)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 36995892c271cce5e2230bc165a06f109b117222 25c45a2075cc00faed45f92a64bb172fb074a2ee git Not specified
CNA Linux Linux affected 36995892c271cce5e2230bc165a06f109b117222 5747eaa38a7fcad48be2fd910b65008198b2b06c git Not specified
CNA Linux Linux affected 36995892c271cce5e2230bc165a06f109b117222 877b61a67d5eb3e616478daf3908114b57feff1e git Not specified
CNA Linux Linux affected 36995892c271cce5e2230bc165a06f109b117222 fa00193eb991f92b007aefe7afb6a7566976dacf git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.54 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.8 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fa00193eb991f92b007aefe7afb6a7566976dacf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/877b61a67d5eb3e616478daf3908114b57feff1e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5747eaa38a7fcad48be2fd910b65008198b2b06c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/25c45a2075cc00faed45f92a64bb172fb074a2ee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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