Bug 2363683 (CVE-2023-53113)

Summary: CVE-2023-53113 kernel: wifi: nl80211: fix NULL-ptr deref in offchan check
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the cfg80211 module in the Linux kernel. In Access Point (AP) mode, if a wireless link is created by userspace but not yet activated, it may contain an invalid channel definition with no channel. This issue may cause a NULL pointer dereference that results in a denial of service.
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Description OSIDB Bzimport 2025-05-02 16:01:33 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: nl80211: fix NULL-ptr deref in offchan check

If, e.g. in AP mode, the link was already created by userspace
but not activated yet, it has a chandef but the chandef isn't
valid and has no channel. Check for this and ignore this link.
Comment 1 Avinash Hanwate 2025-05-05 05:19:19 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025050228-CVE-2023-53113-a3ff@gregkh/T