What’s Vulnerable › Vulnerabilities

CVE-2025-40056: vhost: vringh: Fix copy_to_iter return value check

• 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 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: vhost: vringh: Fix copy_to_iter return value check The return value of copy_to_iter can't be negative, check whether the copied length is equal to the requested length instead of checking for negative values.

Affected products

• Linux kernel: 6.0 — fixed in 6.18

How to fix

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

References

• https://git.kernel.org/stable/c/439263376c2c4e126cac0d07e4987568de4eaba5
• https://git.kernel.org/stable/c/68aac2b335d474b938d154b9c95cbc58838cb2ce
• https://git.kernel.org/stable/c/781226e11d5bdea0d69c7b5aa3cda874093c73b8
• https://git.kernel.org/stable/c/b3a950d236e98440c07405ba597b11bce56a8050
• https://git.kernel.org/stable/c/bd71e7e0a612740e4de5524880c7cd40293af5f7

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