---
id: CVE-2026-64571
title: 'wifi: p54: validate RX frame length in p54_rx_eeprom_readback()'
summary: |-
  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 with…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 <
    7a456ffcd20bd92ad0ef46c1aaa0e39e3be1f7e7
  - >-
    Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 <
    88f7044f92b8326fbfab26d0d8ed297c367ebb76
  - >-
    Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 <
    f21b7e096fe5371bf697cd410537fb434a763f5e
  - >-
    Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 <
    25c3b85af3fc4f8043159b14e65790fc3bbdaf48
  - >-
    Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 <
    f46f8f9c43fd02f4dd5f716d4bda296a523c04f0
  - >-
    Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 <
    d38f5d868a0a4770e3bcd0925e16c46acdbc9509
  - >-
    Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 <
    9096e1f7014174067239a63df18ae5f28301990d
  - >-
    Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 <
    ebd6d37fa94bee929e0b4c9ca19fdf9b1dcf6cea
  - Linux 2.6.28
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:41:37.154533Z'
published: '2026-08-05'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:44:57.541Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-64571'
references:
  - url: 'https://git.kernel.org/stable/c/7a456ffcd20bd92ad0ef46c1aaa0e39e3be1f7e7'
  - url: 'https://git.kernel.org/stable/c/88f7044f92b8326fbfab26d0d8ed297c367ebb76'
  - url: 'https://git.kernel.org/stable/c/f21b7e096fe5371bf697cd410537fb434a763f5e'
  - url: 'https://git.kernel.org/stable/c/25c3b85af3fc4f8043159b14e65790fc3bbdaf48'
  - url: 'https://git.kernel.org/stable/c/f46f8f9c43fd02f4dd5f716d4bda296a523c04f0'
  - url: 'https://git.kernel.org/stable/c/d38f5d868a0a4770e3bcd0925e16c46acdbc9509'
  - url: 'https://git.kernel.org/stable/c/9096e1f7014174067239a63df18ae5f28301990d'
  - url: 'https://git.kernel.org/stable/c/ebd6d37fa94bee929e0b4c9ca19fdf9b1dcf6cea'
tags:
  - cve.org
epss: 0.00171
epssPercentile: 0.06493
ingestedAt: '2026-11-06T16:57:43.151Z'
---

## Overview

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.

## Affected

- `Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 < 7a456ffcd20bd92ad0ef46c1aaa0e39e3be1f7e7`
- `Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 < 88f7044f92b8326fbfab26d0d8ed297c367ebb76`
- `Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 < f21b7e096fe5371bf697cd410537fb434a763f5e`
- `Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 < 25c3b85af3fc4f8043159b14e65790fc3bbdaf48`
- `Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 < f46f8f9c43fd02f4dd5f716d4bda296a523c04f0`
- `Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 < d38f5d868a0a4770e3bcd0925e16c46acdbc9509`
- `Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 < 9096e1f7014174067239a63df18ae5f28301990d`
- `Linux >= 7cb770729ba895f73253dfcd46c3fcba45d896f9 < ebd6d37fa94bee929e0b4c9ca19fdf9b1dcf6cea`
- `Linux 2.6.28`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.