Bug 2402236 (CVE-2022-50533)

Summary: CVE-2022-50533 kernel: wifi: mac80211: mlme: fix null-ptr deref on failed assoc
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-10-07 16:04:41 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: mlme: fix null-ptr deref on failed assoc

If association to an AP without a link 0 fails, then we crash in
tracing because it assumes that either ap_mld_addr or link 0 BSS
is valid, since we clear sdata->vif.valid_links and then don't
add the ap_mld_addr to the struct.

Since we clear also sdata->vif.cfg.ap_addr, keep a local copy of
it and assign it earlier, before clearing valid_links, to fix
this.
Comment 1 Jon Moroney 2025-10-07 17:25:52 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100708-CVE-2022-50533-7dfc@gregkh/T