Bug 2320243 (CVE-2024-47712)

Summary: CVE-2024-47712 kernel: wifi: wilc1000: fix potential RCU dereference issue in wilc_parse_join_bss_param
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2320378    
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Description OSIDB Bzimport 2024-10-21 13:04:57 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: wilc1000: fix potential RCU dereference issue in wilc_parse_join_bss_param

In the `wilc_parse_join_bss_param` function, the TSF field of the `ies`
structure is accessed after the RCU read-side critical section is
unlocked. According to RCU usage rules, this is illegal. Reusing this
pointer can lead to unpredictable behavior, including accessing memory
that has been updated or causing use-after-free issues.

This possible bug was identified using a static analysis tool developed
by myself, specifically designed to detect RCU-related issues.

To address this, the TSF value is now stored in a local variable
`ies_tsf` before the RCU lock is released. The `param->tsf_lo` field is
then assigned using this local variable, ensuring that the TSF value is
safely accessed.
Comment 1 Robb Gatica 2024-10-21 15:43:07 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102118-CVE-2024-47712-13c2@gregkh/T