What’s Vulnerable › Vulnerabilities

CVE-2025-21734: misc: fastrpc: Fix copy buffer page size

• 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: 2025-02-27 · updated 2026-07-30
• Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Fix copy buffer page size For non-registered buffer, fastrpc driver copies the buffer and pass it to the remote subsystem. There is a problem with current implementation of page size calculation which is not considering the offset in the calculation. This might lead to passing of improper and out-of-bounds page size which could result in memory issue. Calculate page start and page end using the offset adjusted address instead of absolute address.

Affected products

• Linux kernel: from 5.2 before 6.1.129; from 6.2 before 6.6.78; from 6.7 before 6.12.14; from 6.13 before 6.13.3 — fixed in 6.1.129, 6.12.14, 6.13.3, 6.6.78

How to fix

Upgrade to a fixed version: Linux kernel 6.1.129, 6.12.14, 6.13.3, 6.6.78. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/24a79c6bc8de763f7c50f4f84f8b0c183bc25a51
• https://git.kernel.org/stable/c/c0464bad0e85fcd5d47e4297d1e410097c979e55
• https://git.kernel.org/stable/c/c3f7161123fcbdc64e90119ccce292d8b66281c4
• https://git.kernel.org/stable/c/c56ba3ea8e3c9a69a992aad18f7a65e43e51d623
• https://git.kernel.org/stable/c/e966eae72762ecfdbdb82627e2cda48845b9dd66
• https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html

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