Bug 2486474 (CVE-2026-46293)

Summary: CVE-2026-46293 kernel: clk: microchip: mpfs-ccc: fix out of bounds access during output registration
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: unspecified    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's clock driver for Microchip PolarFire SoC (MPFS) systems. This vulnerability involves an out-of-bounds memory access that occurs during the registration of clock outputs. The issue stems from incorrect memory allocation within the driver, which can lead to system instability or a denial of service (DoS) condition.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-06-08 17:03:56 UTC 
In the Linux kernel, the following vulnerability has been resolved:

clk: microchip: mpfs-ccc: fix out of bounds access during output registration

UBSAN reported an out of bounds access during registration of the last
two outputs. This out of bounds access occurs because space is only
allocated in the hws array for two PLLs and the four output dividers
that each has, but the defined IDs contain two DLLS and their two
outputs each, which are not supported by the driver. The ID order is
PLLs -> DLLs -> PLL outputs -> DLL outputs. Decrement the PLL output IDs
by two while adding them to the array to avoid the problem.
Comment 1 Keith Grant 2026-06-08 19:19:52 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026060857-CVE-2026-46293-b59c@gregkh/T