CVE-2023-54041: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-54041 is a memory leak vulnerability in the Linux kernel's io_uring subsystem, specifically triggered when removing provided buffers. When io_buffer structs are removed, they are not properly disposed of — because they are allocated in page-sized groups, they cannot be freed individually and must instead be returned to a free list such as io_buffers_cache. The CVE was published on December 24, 2025, and is sourced from kernel.org. No official CVSS score has been assigned by NVD at this time; Feedly estimates the severity as Medium (Feedly, CVE.org).

The root cause is improper memory management (CWE not formally assigned by NVD) in the Linux kernel's io_uring subsystem. When provided buffers are removed via the IORING_OP_REMOVE_BUFFERS operation, the associated io_buffer structs are not returned to the io_buffers_cache free list, causing a kernel memory leak. The fix extends the lock scope during buffer destruction to ensure all callers properly return freed structs to the cache. Affected kernel versions span from the introduction of the vulnerable code (commit cc3cec8367cba76a8ae4c271eba8450f3efc1ba3) up to the patched commits (kernel.org patch 1, kernel.org patch 2, kernel.org patch 3).

The primary impact of this vulnerability is a kernel memory leak, which can gradually exhaust available kernel memory on affected systems over time. Sustained exploitation or repeated triggering of the vulnerable code path could degrade system performance and potentially lead to denial of service conditions. There is no evidence of confidentiality or integrity impact; the vulnerability does not enable code execution or privilege escalation based on currently available information (Feedly).

The Linux kernel maintainers have released patches addressing this vulnerability across multiple stable branches. The fixes are available in commits ac48787f58d1068f4e06d627c1135784d64b4c72, b4a72c0589fdea6259720375426179888969d6a2, and c117c15927772d1624c29c092b6bd3f47c7faa48, corresponding to patched versions including Linux 6.1.24 and 6.2.11 (kernel.org patch 1, kernel.org patch 2, kernel.org patch 3). Administrators should update to a patched kernel version. As a temporary workaround, disabling io_uring via sysctl -w kernel.io_uring_disabled=1 (where supported) can mitigate exposure, though this will impact applications relying on io_uring.