What’s Vulnerable › Vulnerabilities

CVE-2025-40057: ptp: Add a upper bound on max_vclocks

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-28 · updated 2026-10-30

Description

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

Affected products

• Linux: 5.14 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/35ce5f163889dbce88eda1df661b357a09bbed87
• https://git.kernel.org/stable/c/5ba2f8fd3db1c695f74f7f5df72eb87d52668a66
• https://git.kernel.org/stable/c/8dd446056336faa2283d62cefc2f576536845edc
• https://git.kernel.org/stable/c/da513f2ad1b1b1cf1880ccc2603ce1f1f818eb2e
• https://git.kernel.org/stable/c/e9f35294e18da82162004a2f35976e7031aaf7f9

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