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CVE-2026-64351

UnknownEPSS 0.18%

Last modified

CVE-2026-64351 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability
0.18%

8.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= d40261236e8e278cb1936cb5e934262971692b10, < 391706889a5112feafdc0c68db3ecc7ed325d09c; >= d40261236e8e278cb1936cb5e934262971692b10, < aa4eef2cbb66ea3dfcfc24bdce798dd78a81b54b; >= d40261236e8e278cb1936cb5e934262971692b10, < 2d04c37ed4e1d0f733ad39ec35b5a5d8818b4f4a; >= d40261236e8e278cb1936cb5e934262971692b10, < 46ab32870d010e9a057bc5659cea22b7e728ca88; >= d40261236e8e278cb1936cb5e934262971692b10, < c466097d85d52f3aa200736cb4759e66d4bbf6e3; >= d40261236e8e278cb1936cb5e934262971692b10, < e24eb271061db384a3c3ef6f107fe515e68ef222; >= d40261236e8e278cb1936cb5e934262971692b10, < 51e65f1d78457ea4f9513d90ab22c9dccbb35110; >= d40261236e8e278cb1936cb5e934262971692b10, < 47b6bcef6e679593d2e86e04ee72c46a4e2f7139
LinuxLinux3.0

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-64351?
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.
How severe is CVE-2026-64351?
Severity scoring for CVE-2026-64351 is pending analysis. The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64351?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST