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CVE-2026-63899: USB: serial: mxuport: fix memory corruption with small endpoint

• 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: 2026-07-19 · updated 2026-10-30
• Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: USB: serial: mxuport: fix memory corruption with small endpoint Make sure that the bulk-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption should a malicious device report a smaller size.

Affected products

• Linux kernel: from 3.14 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.35 — fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35
• Linux kernel: 3.14 — fixed in 7.1

How to fix

Upgrade to a fixed version: Linux kernel 5.10.259, 5.15.210, 6.1.176, 6.6.143; Linux kernel 7.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/086b858b5f5125bc9d967ea2bd825f83d9f8f29d
• https://git.kernel.org/stable/c/2f3661eb2446e1ef593da45e01a3b21a906768ec
• https://git.kernel.org/stable/c/4085f0dbb1ce2251c9a5938d693de6593f0ab2bd
• https://git.kernel.org/stable/c/6c0cf56f00f280d72180bb6ce79741bc787a6269
• https://git.kernel.org/stable/c/b40166b4ef96067620a0f248e74ad9658c8f680c
• https://git.kernel.org/stable/c/be3a1ed4ae51fa8dde57383277d336ce834f2cd9
• https://git.kernel.org/stable/c/ccbec56f2f9af008f1574335cc6a668f16603e47
• https://git.kernel.org/stable/c/e906545641d34fb1a09a65b4b5cfdff40eb09681

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