What’s Vulnerable › Vulnerabilities

CVE-2026-74681: usb: misc: usbio: check ibuf_len against rxbuf_len in bulk msg

• Severity: unknown
• 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: 2026-08-22 · updated 2026-10-14

Description

In the Linux kernel, the following vulnerability has been resolved: usb: misc: usbio: check ibuf_len against rxbuf_len in bulk msg ibuf_len is the bulk IN (receive) buffer size, but the EMSGSIZE check in usbio_bulk_msg() compares it against txbuf_len — the bulk OUT endpoint size. Both are taken independently from different endpoints in usbio_probe(), so the check is wrong when they differ. Use rxbuf_len for the IN direction. This matches the buffer that actually holds the response data.

Affected products

• Linux kernel: 6.18 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/7e22c9f79b200672f3e477421b6c9050d8cf70a5
• https://git.kernel.org/stable/c/9ad0164f78b66b0b5eca3a5748cc94dd87e28124
• https://git.kernel.org/stable/c/ebfd1e82ab0a6d26efd9bdd89de899215851f5bf

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