CVE-2026-68470: wifi: mac80211: validate extension-frame layout before RX
In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: validate extension-frame layout before RX
Extension frames only have the extension header at the regular 802.11 header offset. The generic RX path can still reach helpers and interface dispatch code that read regular header address fields before unsupported extension subtypes are dropped.
mac80211 currently only handles S1G beacon extension frames. Drop other extension subtypes before they can reach regular-header RX processing. For S1G beacons, linearize the SKB with the management-frame path and require the fixed S1G beacon header, including optional fixed fields indicated by frame control, before generic RX dispatch.
Route S1G beacons through the station/default-link RX path without regular-header station lookup. Avoid regular-header address reads in the mac80211 RX paths that process S1G extension beacons, including accept-frame, duplicate-detection, address-copy, and MLO address-translation paths.
Also make ieee80211getbssid() length-safe before returning the S1G source-address pointer.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-68470?
CVE-2026-68470 has a risk rating of 37 indicating a moderate level of concern.
How do I fix CVE-2026-68470?
To address CVE-2026-68470, update to the patched version of the Linux kernel provided by your distribution.
What type of vulnerability is CVE-2026-68470?
CVE-2026-68470 is a vulnerability in the Linux kernel related to improper validation of extension-frame layouts in the wifi mac80211 subsystem.
Who is affected by CVE-2026-68470?
CVE-2026-68470 affects systems running vulnerable versions of the Linux kernel with the mac80211 driver.
When was CVE-2026-68470 published?
CVE-2026-68470 was published on August 15, 2026.