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CVE-2026-63928: USB: serial: omninet: 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: omninet: fix memory corruption with small endpoint Make sure that the bulk-out buffers are at least as large as the hardcoded transfer size to avoid user-controlled 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 6.12.93; 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/0bda1893e4cc4ad2b7dcdbaca246f2af688c6c2a
• https://git.kernel.org/stable/c/0fee0ccac29e088d4bfab7e2d075725dcecd803d
• https://git.kernel.org/stable/c/180996f0ca774001944e4afa452d569ba2f6455c
• https://git.kernel.org/stable/c/4e7d32189d6219beb7db37cd0ea36b6bac7dfedb
• https://git.kernel.org/stable/c/60df93d30f9bdd27db17c4d80ed80ef718d7226b
• https://git.kernel.org/stable/c/9a3860454bdfb765f936965e975c594352602ffc
• https://git.kernel.org/stable/c/b496e25ead5976bce2891dacaed09beb53a54f9f
• https://git.kernel.org/stable/c/f34cf2928387fba01a78381f3258c7e1428897d9

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