Bug 2378979 (CVE-2025-38258)

Summary: CVE-2025-38258 kernel: mm/damon/sysfs-schemes: free old damon_sysfs_scheme_filter->memcg_path on write
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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Description OSIDB Bzimport 2025-07-09 11:01:28 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mm/damon/sysfs-schemes: free old damon_sysfs_scheme_filter->memcg_path on write

memcg_path_store() assigns a newly allocated memory buffer to
filter->memcg_path, without deallocating the previously allocated and
assigned memory buffer.  As a result, users can leak kernel memory by
continuously writing a data to memcg_path DAMOS sysfs file.  Fix the leak
by deallocating the previously set memory buffer.
Comment 1 Jon Moroney 2025-07-09 17:53:03 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025070936-CVE-2025-38258-4e00@gregkh/T