Bug 2320546 (CVE-2024-49954)

Summary: CVE-2024-49954 kernel: static_call: Replace pointless WARN_ON() in static_call_module_notify()
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: 2321049    
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Description OSIDB Bzimport 2024-10-21 19:09:51 UTC 
In the Linux kernel, the following vulnerability has been resolved:

static_call: Replace pointless WARN_ON() in static_call_module_notify()

static_call_module_notify() triggers a WARN_ON(), when memory allocation
fails in __static_call_add_module().

That's not really justified, because the failure case must be correctly
handled by the well known call chain and the error code is passed
through to the initiating userspace application.

A memory allocation fail is not a fatal problem, but the WARN_ON() takes
the machine out when panic_on_warn is set.

Replace it with a pr_warn().
Comment 1 Robb Gatica 2024-10-22 16:40:24 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102130-CVE-2024-49954-cea5@gregkh/T
Comment 2 Avinash Hanwate 2024-10-23 04:32:29 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102130-CVE-2024-49954-cea5@gregkh/T
Comment 3 errata-xmlrpc 2025-05-13 08:30:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:6966 https://access.redhat.com/errata/RHSA-2025:6966