What’s Vulnerable › Vulnerabilities

CVE-2025-21687: vfio/platform: check the bounds of read/write syscalls

• Severity: high (CVSS 7.8 v3.1)
• 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: 2025-02-10 · updated 2026-07-30
• Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: vfio/platform: check the bounds of read/write syscalls count and offset are passed from user space and not checked, only offset is capped to 40 bits, which can be used to read/write out of bounds of the device.

Affected products

• Linux kernel: from 4.1 before 5.4.290; from 5.5 before 5.10.234; from 5.11 before 5.15.178; from 5.16 before 6.1.128; from 6.2 before 6.6.75; from 6.7 before 6.12.12 — fixed in 5.10.234, 5.15.178, 5.4.290, 6.1.128, 6.12.12, 6.6.75

How to fix

Upgrade to a fixed version: Linux kernel 5.10.234, 5.15.178, 5.4.290, 6.1.128. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1485932496a1b025235af8aa1e21988d6b7ccd54
• https://git.kernel.org/stable/c/665cfd1083866f87301bbd232cb8ba48dcf4acce
• https://git.kernel.org/stable/c/6bcb8a5b70b80143db9bf12dfa7d53636f824d53
• https://git.kernel.org/stable/c/92340e6c5122d823ad064984ef7513eba9204048
• https://git.kernel.org/stable/c/9377cdc118cf327248f1a9dde7b87de067681dc9
• https://git.kernel.org/stable/c/a20fcaa230f7472456d12cf761ed13938e320ac3
• https://git.kernel.org/stable/c/c981c32c38af80737a2fedc16e270546d139ccdd
• https://git.kernel.org/stable/c/ce9ff21ea89d191e477a02ad7eabf4f996b80a69
• https://git.kernel.org/stable/c/d19a8650fd3d7aed8d1af1d9a77f979a8430eba1
• https://git.kernel.org/stable/c/ed81d82bb6e9df3a137f2c343ed689e6c68268ef
• https://git.kernel.org/stable/c/f21636f24b6786c8b13f1af4319fa75ffcf17f38
• https://git.kernel.org/stable/c/f65ce06387f8c1fb54bd59e18a8428248ec68eaf

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