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CVE-2025-22049: LoongArch: Increase ARCH_DMA_MINALIGN up to 16

• Severity: medium (CVSS 5.5 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: 2025-04-16 · updated 2026-07-30

Description

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Increase ARCH_DMA_MINALIGN up to 16 ARCH_DMA_MINALIGN is 1 by default, but some LoongArch-specific devices (such as APBDMA) require 16 bytes alignment. When the data buffer length is too small, the hardware may make an error writing cacheline. Thus, it is dangerous to allocate a small memory buffer for DMA. It's always safe to define ARCH_DMA_MINALIGN as L1_CACHE_BYTES but unnecessary (kmalloc() need small memory objects). Therefore, just increase it to 16.

Affected products

• Linux kernel: from 5.19 before 6.1.134; from 6.2 before 6.6.87; from 6.7 before 6.12.23; from 6.13 before 6.13.11; from 6.14 before 6.14.2 — fixed in 6.1.134, 6.12.23, 6.13.11, 6.14.2, 6.6.87

How to fix

Upgrade to a fixed version: Linux kernel 6.1.134, 6.12.23, 6.13.11, 6.14.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1d0def2d1658666ec1f32c9495df60e7411e3c82
• https://git.kernel.org/stable/c/279ec25c2df49fba1cd9488f2ddd045d9cb2112e
• https://git.kernel.org/stable/c/4103cfe9dcb88010ae4911d3ff417457d1b6a720
• https://git.kernel.org/stable/c/8b82aea3666f8f2c78f86148d78aea99c46e0f82
• https://git.kernel.org/stable/c/bfff341cac7c650e6ca8d10503725992f5564d0f
• https://git.kernel.org/stable/c/f39af67f03b564b763b06e44cb960c10a382d54a
• https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

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