Bug 2402697 (CVE-2025-39954)

Summary: CVE-2025-39954 kernel: clk: sunxi-ng: mp: Fix dual-divider clock rate readback
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-10-09 10:01:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

clk: sunxi-ng: mp: Fix dual-divider clock rate readback

When dual-divider clock support was introduced, the P divider offset was
left out of the .recalc_rate readback function. This causes the clock
rate to become bogus or even zero (possibly due to the P divider being
1, leading to a divide-by-zero).

Fix this by incorporating the P divider offset into the calculation.
Comment 1 Jon Moroney 2025-10-09 16:36:18 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100939-CVE-2025-39954-e887@gregkh/T