Bug 2406752 (CVE-2025-40057)

Summary: CVE-2025-40057 kernel: ptp: Add a upper bound on max_vclocks
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 12:03:36 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ptp: Add a upper bound on max_vclocks

syzbot reported WARNING in max_vclocks_store.

This occurs when the argument max is too large for kcalloc to handle.

Extend the guard to guard against values that are too large for
kcalloc
Comment 1 Jon Moroney 2025-10-28 18:39:25 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025102815-CVE-2025-40057-2587@gregkh/T