Bug 2420319 (CVE-2023-53830)

Summary: CVE-2023-53830 kernel: platform/x86: think-lmi: Fix memory leak when showing current settings
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A memory leak was found in the Lenovo ThinkPad LMI driver in the Linux kernel. When current_value_show() encounters malformed item strings from tlmi_setting(), it returns early without freeing the allocated memory. Repeated reads of sysfs attributes could gradually exhaust kernel memory.
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Description OSIDB Bzimport 2025-12-09 02:02:38 UTC 
In the Linux kernel, the following vulnerability has been resolved:

platform/x86: think-lmi: Fix memory leak when showing current settings

When retriving a item string with tlmi_setting(), the result has to be
freed using kfree(). In current_value_show() however, malformed
item strings are not freed, causing a memory leak.
Fix this by eliminating the early return responsible for this.
Comment 1 Alexander B 2025-12-10 01:52:49 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120953-CVE-2023-53830-7785@gregkh/T