CVE-2026-64547 net: usb: net1080: validate packet_len before pad-byte access in rx_fixup
A malicious USB device can trigger an out-of-bounds read in the Linux kernel net1080 driver, potentially causing a crash or leaking memory.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64547?
CVE-2026-64547 is a high-severity memory corruption vulnerability in Linux, published on 27 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: usb: net1080: validate packet_len before pad-byte access in rx_fixup
For an even packet_len, net1080_rx_fixup() reads the pad byte at skb->data[packet_len] before the skb->len != packet_len check further down, and packet_len is only bounded against NC_MAX_PACKET. A malicious NetChip 1080 device can send a short frame advertising a large even packet_len (e.g. 0x4000), so the pad-byte read lands past the end of the skb:
BUG: KASAN: slab-out-of-bounds in net1080_rx_fixup Read of size 1 at addr ffff8880106c83c6 by task ksoftirqd/0/14 ... net1080_rx_fixup (drivers/net/usb/net1080.c:384) usbnet_bh (drivers/net/usb/usbnet.c:1589) process_one_work (kernel/workqueue.c:3322) bh_worker (kernel/workqueue.c:3708) tasklet_action (kernel/softirq.c:965) handle_softirqs (kernel/softirq.c:622) ...
Reject the frame when packet_len >= skb->len before reading.
Weakness: CWE-125
Which versions are affected by CVE-2026-64547?
How do I fix CVE-2026-64547?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-64547 being exploited?
There is no known exploitation of CVE-2026-64547 in the wild and no public exploit code.
Sources
Also known as AZL-94064, BELL-CVE-2026-64547, DEBIAN-CVE-2026-64547, GHSA-wxqx-m575-fh25, ROOT-OS-DEBIAN-12-CVE-2026-64547, UBUNTU-CVE-2026-64547.