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CVE-2026-63898: USB: serial: mct_u232: 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: mct_u232: fix memory corruption with small endpoint The driver overrides the maximum transfer size for a specific device which only accepts 16 byte packets for its 32 byte bulk-out endpoint. Make sure to never increase the maximum transfer size to prevent slab corruption should a malicious device report a smaller endpoint max packet size than expected.

Affected products

• Linux kernel: from 2.6.12.1 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 6.12.94; from 6.13 before 6.18.35 — fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.35
• Linux kernel: 2.6.12 — 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/39e295a91e80f3b91f61c7ada2bde434dcaba20d
• https://git.kernel.org/stable/c/57f332af1745014cd7e40414814ffaa6bc7d3b5b
• https://git.kernel.org/stable/c/6cb48f8890f9b2051d7c34823057296a536a31c5
• https://git.kernel.org/stable/c/90dbad14b109e5fdfb4934ff61e561d11ba3742d
• https://git.kernel.org/stable/c/915b36d701950503c4ea0f6e314b10868e59fce3
• https://git.kernel.org/stable/c/94edbbc5fe00d03cfe1d4e690d7d2cd36317a935
• https://git.kernel.org/stable/c/bd2ddb3fe9052ad8703593bbec26ecc7ca92869e
• https://git.kernel.org/stable/c/d8fdf33d6fcfb90cbec26299baf2352c84b2d768

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