Bug 2348569 (CVE-2025-21734)

Summary: CVE-2025-21734 kernel: misc: fastrpc: Fix copy buffer page size
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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OS: Linux   
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Description OSIDB Bzimport 2025-02-27 03:03:34 UTC 
In the Linux kernel, the following vulnerability has been resolved:

misc: fastrpc: Fix copy buffer page size

For non-registered buffer, fastrpc driver copies the buffer and
pass it to the remote subsystem. There is a problem with current
implementation of page size calculation which is not considering
the offset in the calculation. This might lead to passing of
improper and out-of-bounds page size which could result in
memory issue. Calculate page start and page end using the offset
adjusted address instead of absolute address.
Comment 1 Michal Findra 2025-02-27 18:29:39 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022658-CVE-2025-21734-ac40@gregkh/T