Bug 2540423 (CVE-2026-93806) - CVE-2026-93806 kernel: wifi: cfg80211: validate assoc response length before status and IE access
Summary: CVE-2026-93806 kernel: wifi: cfg80211: validate assoc response length before ...
Keywords:
Status: NEW
Alias: CVE-2026-93806
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-24 16:46 UTC by OSIDB Bzimport
Modified: 2026-09-28 12:49 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2026-09-24 16:46:10 UTC
In the Linux kernel, the following vulnerability has been resolved:

wifi: cfg80211: validate assoc response length before status and IE access

cfg80211_rx_assoc_resp() initialises the status and response-IE fields
of cfg80211_connect_resp_params from the management frame before
proving that the frame is long enough for those offsets. S1G and
regular association responses also have different IE offsets, but the
S1G path only patched resp_ie after the unsafe initialiser had already
run.

Defer resp_ie, resp_ie_len, and status to after the link-iteration
loop. Use a bool to remember whether the frame is S1G, then validate
the appropriate minimum length and set all three fields in a single
if/else block. Funnel short-frame and SME-reject cleanup through a
shared free_bss label for the abandon paths.


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