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CVE-2026-63897: USB: serial: mct_u232: fix missing interrupt-in transfer sanity check

• 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: 2026-07-19 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: USB: serial: mct_u232: fix missing interrupt-in transfer sanity check Add the missing sanity check on the size of interrupt-in transfers to avoid parsing stale or uninitialised slab data (and leaking it to user space).

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 6.12.93; 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: 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/245aba83e3c288e176ed037a1f6b618b09e92ed8
• https://git.kernel.org/stable/c/631b8b7c456567f7a8d26f6fc354c8dd9cc9f832
• https://git.kernel.org/stable/c/70bb9a2661d34b93a9b83cf83e2b76289a712ef0
• https://git.kernel.org/stable/c/82b48d70bced1ec8e5f676d1fd5eccc7a44dc418
• https://git.kernel.org/stable/c/8b93ee5baeef6efabee2c3381907733ad2dbc883
• https://git.kernel.org/stable/c/a093f3e0c03d25a86d747a655d4b9322ffb2ed87
• https://git.kernel.org/stable/c/ed260b56bc9fc878e5dcbb866eab8af0688e0e67
• https://git.kernel.org/stable/c/f06bcaba29707f060706483b2020d3cafbe98f9f

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