Medium 5.5Published Jul 25, 2026

CVE-2026-64351net: usb: kalmia: bound RX frame length in kalmia_rx_fixup()

Updated under an hour ago (Oct 27, 2026, 12:30 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Aug 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from d40261236e8e278cb1936cb5e934262971692b10 before 391706889a5112feafdc0c68db3ecc7ed325d09c; from d40261236e8e278cb1936cb5e934262971692b10 before aa4eef2cbb66ea3dfcfc24bdce798dd78a81b54b; from d40261236e8e278cb1936cb5e934262971692b10 before 2d04c37ed4e1d0f733ad39ec35b5a5d8818b4f4a; from d40261236e8e278cb1936cb5e934262971692b10 before 46ab32870d010e9a057bc5659cea22b7e728ca88; from d40261236e8e278cb1936cb5e934262971692b10 before c466097d85d52f3aa200736cb4759e66d4bbf6e3; from d40261236e8e278cb1936cb5e934262971692b10 before e24eb271061db384a3c3ef6f107fe515e68ef222; from d40261236e8e278cb1936cb5e934262971692b10 before 51e65f1d78457ea4f9513d90ab22c9dccbb35110; from d40261236e8e278cb1936cb5e934262971692b10 before 47b6bcef6e679593d2e86e04ee72c46a4e2f7139	CNA record
linux linux_kernel linux:linux_kernel	from 3.0.1 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4; 3.0; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/391706889a5112feafdc0c68db3ecc7ed325d09c	patch
https://git.kernel.org/stable/c/aa4eef2cbb66ea3dfcfc24bdce798dd78a81b54b	patch
https://git.kernel.org/stable/c/2d04c37ed4e1d0f733ad39ec35b5a5d8818b4f4a	patch
https://git.kernel.org/stable/c/46ab32870d010e9a057bc5659cea22b7e728ca88	patch
https://git.kernel.org/stable/c/c466097d85d52f3aa200736cb4759e66d4bbf6e3	patch
https://git.kernel.org/stable/c/e24eb271061db384a3c3ef6f107fe515e68ef222	patch
https://git.kernel.org/stable/c/51e65f1d78457ea4f9513d90ab22c9dccbb35110	patch
https://git.kernel.org/stable/c/47b6bcef6e679593d2e86e04ee72c46a4e2f7139	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.