What’s Vulnerable › Vulnerabilities

CVE-2026-97929: ALSA: usbusx2y: validate URB actual_length in interrupt callback

• 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: 2026-09-25 · updated 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usbusx2y: validate URB actual_length in interrupt callback i_usx2y_in04_int() processes the interrupt URB data without checking urb->actual_length. A short transfer from a malfunctioning device would cause the handler to process uninitialized heap data from the kmalloc-allocated in04_buf, which is then copied to the mmap-accessible ctl_snapshot[] array. Fix by using kzalloc() for in04_buf to zero-initialize the buffer, and adding an actual_length check to skip processing on short transfers while still resubmitting the URB.

Affected products

• Linux kernel: 2.6.12 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2770321b358658e0a39fe39ccf6a91ee97a81931
• https://git.kernel.org/stable/c/8f5ef203abda9dd36b2af473c7b737d544f807bd
• https://git.kernel.org/stable/c/b0c30fe6c0d5902bd8a7d1d5720bead5bbe46f7d
• https://git.kernel.org/stable/c/c156584999bf15118f523ef6c6fedc5b21f46bd9
• https://git.kernel.org/stable/c/c3576cb77b527f223cf2b9fc2b2e9af5e7adee25

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