CVE-2026-64571 wifi: p54: validate RX frame length in p54_rx_eeprom_readback()
A malicious USB device can trigger a heap out-of-bounds read in the p54 WiFi driver, leaking adjacent kernel 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-2026-64571?
CVE-2026-64571 is a vulnerability in Linux, published on 5 Aug 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:
wifi: p54: validate RX frame length in p54_rx_eeprom_readback()
p54_rx_eeprom_readback() copies the requested EEPROM slice out of a device-supplied readback frame without checking that the skb actually holds that many bytes. Commit da1b9a55ff11 ("wifi: p54: prevent buffer-overflow in p54_rx_eeprom_readback()") closed the destination overflow by copying a fixed priv->eeprom_slice_size (and rejecting a mismatched advertised len), but the source side is still unbounded: nothing verifies the frame is long enough to supply that many bytes.
A malicious USB device can send a short frame whose advertised len matches priv->eeprom_slice_size while the payload is truncated. The equality check passes and memcpy() reads past the end of the skb, leaking adjacent heap:
BUG: KASAN: slab-out-of-bounds in p54_rx (drivers/net/wireless/intersil/p54/txrx.c:507) Read of size 1016 at addr ffff88800f077114 by task swapper/0/0 Call Trace: <IRQ> ... __asan_memcpy (mm/kasan/shadow.c:105) p54_rx (drivers/net/wireless/intersil/p54/txrx.c:507) p54u_rx_cb (drivers/net/wireless/intersil/p54/p54usb.c:163) __usb_hcd_giveback_urb (drivers/usb/core/hcd.c:1657) dummy_timer (drivers/usb/gadget/udc/dummy_hcd.c:2005) ... </IRQ>
The buggy address belongs to the object at ffff88800f0770c0 which belongs to the cache skbuff_small_head of size 704 The buggy address is located 84 bytes inside of allocated 704-byte region [ffff88800f0770c0, ffff88800f077380)
Check that the slice fits in the skb before copying.
Which versions are affected by CVE-2026-64571?
How do I fix CVE-2026-64571?
Apply the vendor's patch.
Is CVE-2026-64571 being exploited?
There is no known exploitation of CVE-2026-64571 in the wild and no public exploit code.
Sources
Also known as AZL-94455, BELL-CVE-2026-64571, DEBIAN-CVE-2026-64571, GHSA-2fqj-w26w-hj6r, UBUNTU-CVE-2026-64571.