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CVE-2026-31661: wifi: brcmsmac: Fix dma_free_coherent() size

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-24 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmsmac: Fix dma_free_coherent() size dma_alloc_consistent() may change the size to align it. The new size is saved in alloced. Change the free size to match the allocation size.

Affected products

• Linux kernel: from 3.2.1 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.169; from 6.2 before 6.6.135; from 6.7 before 6.12.82; from 6.13 before 6.18.23 — fixed in 5.10.253, 5.15.203, 6.1.169, 6.12.82, 6.18.23, 6.19.13

How to fix

Upgrade to a fixed version: Linux kernel 5.10.253, 5.15.203, 6.1.169, 6.12.82. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/01f1330d3d1bee07e0c42d40cc48b7be8b6dad84
• https://git.kernel.org/stable/c/0f87777b74bcce29b966ec42d9aa8f9edd9b1667
• https://git.kernel.org/stable/c/12cd7632757a54ce586e36040210b1a738a0fc53
• https://git.kernel.org/stable/c/3c204a0fd079fa7a867151a47d830ad1c2db5177
• https://git.kernel.org/stable/c/4bf41c2731a0549e21f66180ff780b1e036639ab
• https://git.kernel.org/stable/c/77263f053963dea9f3962505ac0c768853d7dc59
• https://git.kernel.org/stable/c/b27fa888e4a426a3bcf6f6ab24701d888d9bf5aa
• https://git.kernel.org/stable/c/f449676bab54fea1440775c8c915dadb323fe015

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