Bug 2347703 (CVE-2022-49127)

Summary: CVE-2022-49127 kernel: ref_tracker: implement use-after-free detection
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A vulnerability was found in the Linux kernel's ref_tracker subsystem, which can lead to a use-after-free condition due to improper handling of reference tracking during network device teardown. Specifically, when ref_tracker_dir_init() is invoked, it marks the associated ref_tracker_dir structure as dead. However, if functions such as dev_put() or dev_hold() are called after this point, particularly during the dismantling of network devices, they may operate on already freed memory, which can lead to memory corruption and system instability.
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Description OSIDB Bzimport 2025-02-26 03:03:47 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ref_tracker: implement use-after-free detection

Whenever ref_tracker_dir_init() is called, mark the struct ref_tracker_dir
as dead.

Test the dead status from ref_tracker_alloc() and ref_tracker_free()

This should detect buggy dev_put()/dev_hold() happening too late
in netdevice dismantle process.
Comment 1 Avinash Hanwate 2025-02-26 14:27:28 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022605-CVE-2022-49127-15e6@gregkh/T
Comment 4 Avinash Hanwate 2025-02-26 18:24:54 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022605-CVE-2022-49127-15e6@gregkh/T