# CVE-2026-64571: CVE-2026-64571

Status: published. Published: 2026-08-05. Updated: 2026-11-03.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

Not reported in collected sources.

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/25c3b85af3fc4f8043159b14e65790fc3bbdaf48 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/7a456ffcd20bd92ad0ef46c1aaa0e39e3be1f7e7 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/88f7044f92b8326fbfab26d0d8ed297c367ebb76 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/9096e1f7014174067239a63df18ae5f28301990d (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/d38f5d868a0a4770e3bcd0925e16c46acdbc9509 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/ebd6d37fa94bee929e0b4c9ca19fdf9b1dcf6cea (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/f21b7e096fe5371bf697cd410537fb434a763f5e (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/f46f8f9c43fd02f4dd5f716d4bda296a523c04f0 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-64571; retrieved 2026-11-03; source updated 2026-11-03

Revision: 6a6dedb088391589b394f798ac7bdf39f5ef1de0cbcbcf56e90e5b7656f4e593

Canonical: https://y2.dev/cve/CVE-2026-64571

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