Bug 2406746 (CVE-2025-40036)

Summary: CVE-2025-40036 kernel: misc: fastrpc: fix possible map leak in fastrpc_put_args
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-10-28 12:03:13 UTC 
In the Linux kernel, the following vulnerability has been resolved:

misc: fastrpc: fix possible map leak in fastrpc_put_args

copy_to_user() failure would cause an early return without cleaning up
the fdlist, which has been updated by the DSP. This could lead to map
leak. Fix this by redirecting to a cleanup path on failure, ensuring
that all mapped buffers are properly released before returning.
Comment 1 Jon Moroney 2025-10-28 18:52:39 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025102811-CVE-2025-40036-a568@gregkh/T