Bug 2435654 (CVE-2026-23024)

Summary: CVE-2026-23024 kernel: Linux kernel (idpf): Memory leak leading to denial of service via improper cleanup during module removal
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's `idpf` module. This vulnerability allows a local user to cause a memory leak by removing the module while active flow steering list entries are present. The flaw occurs because the list is not properly cleaned up during module removal. Over time, this memory leak can lead to a denial of service (DoS) on the system.
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Description OSIDB Bzimport 2026-01-31 12:02:01 UTC 
In the Linux kernel, the following vulnerability has been resolved:

idpf: fix memory leak of flow steer list on rmmod

The flow steering list maintains entries that are added and removed as
ethtool creates and deletes flow steering rules. Module removal with active
entries causes memory leak as the list is not properly cleaned up.

Prevent this by iterating through the remaining entries in the list and
freeing the associated memory during module removal. Add a spinlock
(flow_steer_list_lock) to protect the list access from multiple threads.
Comment 1 Alexander B 2026-02-02 10:17:07 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026013137-CVE-2026-23024-5861@gregkh/T