Bug 2337096 (CVE-2024-48876)

Summary: CVE-2024-48876 kernel: stackdepot: fix stack_depot_save_flags() in NMI context
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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Description OSIDB Bzimport 2025-01-11 13:01:22 UTC 
In the Linux kernel, the following vulnerability has been resolved:

stackdepot: fix stack_depot_save_flags() in NMI context

Per documentation, stack_depot_save_flags() was meant to be usable from
NMI context if STACK_DEPOT_FLAG_CAN_ALLOC is unset.  However, it still
would try to take the pool_lock in an attempt to save a stack trace in the
current pool (if space is available).

This could result in deadlock if an NMI is handled while pool_lock is
already held.  To avoid deadlock, only try to take the lock in NMI context
and give up if unsuccessful.

The documentation is fixed to clearly convey this.
Comment 1 Avinash Hanwate 2025-01-13 09:46:51 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025011121-CVE-2024-48876-da61@gregkh/T
Comment 3 Avinash Hanwate 2025-06-02 06:10:43 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025011121-CVE-2024-48876-da61@gregkh/T