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CVE-2026-97930: ALSA: usbusx2y: fix in04_last array size mismatch with in04_buf

• 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 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usbusx2y: fix in04_last array size mismatch with in04_buf The in04_last array in struct usx2ydev is declared as char[24], but in04_buf is allocated as sizeof(struct us428_ctls) which is 21 bytes. In i_usx2y_in04_int(), when ctl_snapshot_last == -2 (initialization path): memcpy(usx2y->in04_last, usx2y->in04_buf, sizeof(usx2y->in04_last)); This copies 24 bytes from a 21-byte slab allocation, reading 3 bytes past the end of the source object. Introduce a USX2Y_IN04_SIZE constant defined as sizeof(struct us428_ctls) and use it consistently for the in04_last array, the in04_buf allocation, the URB transfer length, and the comparison loop, replacing the bare 24 and 21 literals throughout.

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/229cab526580f82839ae8e4e379753c8cf16952e
• https://git.kernel.org/stable/c/381495b5b3da12d714e53d9d12d955b13fe26eac
• https://git.kernel.org/stable/c/861111a14740e12c36d363e9830f8daa734279c9
• https://git.kernel.org/stable/c/869fb83c072e884b80d93eab498e6040ffb010ba
• https://git.kernel.org/stable/c/b5753bdfd909f7f095fb464d67802b5e52cbadbf
• https://git.kernel.org/stable/c/d170cfbe38c8817ac787f605655546a6d343017d
• https://git.kernel.org/stable/c/e75e4b0e647137f4c9f6dee4a7ef5b7b09e16f57

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