Bug 2424997 (CVE-2023-54041)

Summary: CVE-2023-54041 kernel: Linux kernel: Memory leak in io_uring can lead to denial of service
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's io_uring subsystem. When removing provided buffers, the system fails to properly dispose of `io_buffer` structures, leading to a memory leak. A local attacker could exploit this vulnerability to cause a denial of service (DoS) due to memory exhaustion.
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Description OSIDB Bzimport 2025-12-24 12:06:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

io_uring: fix memory leak when removing provided buffers

When removing provided buffers, io_buffer structs are not being disposed
of, leading to a memory leak. They can't be freed individually, because
they are allocated in page-sized groups. They need to be added to some
free list instead, such as io_buffers_cache. All callers already hold
the lock protecting it, apart from when destroying buffers, so had to
extend the lock there.
Comment 1 Alexander B 2025-12-25 09:58:10 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025122440-CVE-2023-54041-57f4@gregkh/T