Bug 2348594 (CVE-2025-21793)

Summary: CVE-2025-21793 kernel: spi: sn-f-ospi: Fix division by zero
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-27 03:04:29 UTC 
In the Linux kernel, the following vulnerability has been resolved:

spi: sn-f-ospi: Fix division by zero

When there is no dummy cycle in the spi-nor commands, both dummy bus cycle
bytes and width are zero. Because of the cpu's warning when divided by
zero, the warning should be avoided. Return just zero to avoid such
calculations.
Comment 1 Michal Findra 2025-02-27 18:56:54 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022609-CVE-2025-21793-2c1e@gregkh/T