Various Linux Kernel WLAN security issues (RCE/DOS) found

[Marcus Meissner <meissner () suse de>]

Hi folks,

Security Researcher Soenke Huster from Tu Darmstadt (
shuster () seemoo tu-darmstadt de ) emailed SUSE with a buffer overwrite in
the Linux Kernel mac80211 framework triggered by WLAN frames.

We delegated the issue to the kernel security folks, and Soenke and
Johannes Berg from Intel evaluated and worked on this issue.

During their research they found multiple more problems in the WLAN
stack, exploitable over the air.

The patchset has been posted to the netdev list just now and will be
merged in the next hours/days:

        https://lore.kernel.org/netdev/20221013100522.46346-1-johannes () sipsolutions net/T/#u

I have requested 5 CVE from Mitre, they are referenced in the commits.

Note that some patches did not get CVEs, as these were not showing any
relevant security impact but only warning messages or UBSAN shift overflow
messages.

CVE-2022-41674: fix u8 overflow in cfg80211_update_notlisted_nontrans
        (max 256 byte overwrite) (RCE)
CVE-2022-42719: wifi: mac80211: fix MBSSID parsing use-after-free
        use after free condition (RCE)
CVE-2022-42720: wifi: cfg80211: fix BSS refcounting bugs
        ref counting use-after-free possibilities (RCE)
CVE-2022-42721: wifi: cfg80211: avoid nontransmitted BSS list corruption
        list corruption, according to Johannes will however just make it endless loop (DOS)
CVE-2022-42722: wifi: mac80211: fix crash in beacon protection for P2P-device
        NULL ptr dereference crash (DOS)

Soenke will post additional details as followup to this email.

Ciao, Marcus