PT-2026-64572 · Linux · Linux
CVE-2026-64351
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Published
2026-07-25
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Updated
2026-07-25
None
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In the Linux kernel, the following vulnerability has been resolved:
net: usb: kalmia: bound RX frame length in kalmia rx fixup()
kalmia rx fixup() computes usb packet length = skb->len - (2 *
KALMIA HEADER LENGTH) as a u16, guarded only by a pre-loop check that
skb->len is at least KALMIA HEADER LENGTH, which is 6. A device can
deliver a short bulk-IN frame with skb->len in the 6 to 11 range, or
leave a short trailing remainder on a later loop iteration. Either case
underflows usb packet length to about 65530.
That bypasses the usb packet length < ether packet length truncation path.
The device-supplied ether packet length, a le16 up to 65535 read from
header start[2], then drives a memcmp() and the following skb trim() and
skb pull() past the end of the rx buffer. The rx buffer is hard mtu * 10,
which is 14000 bytes. That is an out of bounds read.
Require both the start and end framing headers to be present before
subtracting them, on every loop iteration.
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Related Identifiers
Affected Products
Linux