CVE-2026-64571 is a vulnerability in Linux Kernel
Published on August 5, 2026
wifi: p54: validate RX frame length in p54_rx_eeprom_readback()
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.
Products Associated with CVE-2026-64571
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Affected Versions
Linux:- Version 7cb770729ba895f73253dfcd46c3fcba45d896f9 and below 25c3b85af3fc4f8043159b14e65790fc3bbdaf48 is affected.
- Version 7cb770729ba895f73253dfcd46c3fcba45d896f9 and below f46f8f9c43fd02f4dd5f716d4bda296a523c04f0 is affected.
- Version 7cb770729ba895f73253dfcd46c3fcba45d896f9 and below d38f5d868a0a4770e3bcd0925e16c46acdbc9509 is affected.
- Version 7cb770729ba895f73253dfcd46c3fcba45d896f9 and below 9096e1f7014174067239a63df18ae5f28301990d is affected.
- Version 7cb770729ba895f73253dfcd46c3fcba45d896f9 and below ebd6d37fa94bee929e0b4c9ca19fdf9b1dcf6cea is affected.
- Version 2.6.28 is affected.
- Before 2.6.28 is unaffected.
- Version 6.6.148, <= 6.6.* is unaffected.
- Version 6.12.101, <= 6.12.* is unaffected.
- Version 6.18.42, <= 6.18.* is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc4, <= * is unaffected.