Bug 2320580 (CVE-2024-50005)

Summary: CVE-2024-50005 kernel: mac802154: Fix potential RCU dereference issue in mac802154_scan_worker
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: 2320938    
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Description OSIDB Bzimport 2024-10-21 19:12:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mac802154: Fix potential RCU dereference issue in mac802154_scan_worker

In the `mac802154_scan_worker` function, the `scan_req->type` field was
accessed after the RCU read-side critical section was unlocked. According
to RCU usage rules, this is illegal and can lead to unpredictable
behavior, such as 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 `scan_req->type` value is now stored in a local
variable `scan_req_type` while still within the RCU read-side critical
section. The `scan_req_type` is then used after the RCU lock is released,
ensuring that the type value is safely accessed without violating RCU
rules.
Comment 1 Avinash Hanwate 2024-10-22 11:51:09 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102108-CVE-2024-50005-3479@gregkh/T