PT-2026-64708 · Linux · Linux
CVE-2026-64487
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Publicado
2026-07-25
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Atualizado
2026-07-25
Nenhuma
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In the Linux kernel, the following vulnerability has been resolved:
ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser
snd usb caiaq tks4 dispatch() decodes the Traktor Kontrol S4 input
stream in fixed 16-byte (TKS4 MSGBLOCK SIZE) message blocks. On every
iteration it advances buf and subtracts the block size while looping on
"while (len)".
len is urb->actual length. That value is supplied by the device and is
not guaranteed to be a multiple of 16. When a final short block leaves
len between 1 and 15, the loop runs once more, reads up to buf[15], and
then does "len -= TKS4 MSGBLOCK SIZE". As len is unsigned this underflows
to a huge value. The loop then keeps iterating and walking buf far past
the end of the 512-byte ep4 in buf, reading out of bounds until a bogus
block id happens to be hit.
Iterate only while a full message block is available. This stops the
unsigned underflow and silently drops any trailing partial block, which
carries no complete control value anyway.
The sibling endpoint-4 parsers are not affected. The Traktor Kontrol X1
and Maschine arms in snd usb caiaq ep4 reply dispatch() floor
urb->actual length before dispatching.
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