---
id: CVE-2026-98025
title: >-
  In the Linux kernel, the following vulnerability has been resolved:


  net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent
  partial_data heap overflow


  The 0xffff length sentinel detects a router reboot and schedules

  re-…
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent
  partial_data heap overflow


  The 0xffff length sentinel detects a router reboot and schedules

  re-…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 <
    3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287
  - >-
    Linux >= ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 <
    659654654eb140851467af41d610473c100c7975
  - >-
    Linux >= ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 <
    237c9ae7145772af147e4665f158938350fa5658
  - >-
    Linux >= ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 <
    5d50e90add8b4a978395e893e81954d19d58a7c5
  - Linux 5adf7fbdfa3e9e425b04771e1d64c4e184ad8fdb
  - Linux c1b187a86a176e42f5e48066556980e3232b6cab
  - Linux >= 4.19.322 < 4.20
  - Linux >= 5.4.284 < 5.5
  - Linux 5.10
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:31.110'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98025'
references:
  - url: 'https://git.kernel.org/stable/c/237c9ae7145772af147e4665f158938350fa5658'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5d50e90add8b4a978395e893e81954d19d58a7c5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/659654654eb140851467af41d610473c100c7975'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.876Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow

The 0xffff length sentinel detects a router reboot and schedules
re-enabling of ethernet mode, but then falls through to the rest
of the loop body.  The next check is

	} else if (len > CX82310_MTU) {

which is the else of the just-matched if -- it never fires for
len == 0xffff.  The MTU bound that normally caps the
incomplete-packet save path is silently bypassed.

With 0xffff > skb->len always true (rx_urb_size is 4096), the
incomplete-packet branch saves dev->partial_len = skb->len bytes
into dev->partial_data.  partial_data is kmalloc(hard_mtu) =
kmalloc(CX82310_MTU + 2) = 1516 bytes, but skb->len after the
2-byte header pull can be up to 4094.  A device that sends a
4096-byte URB starting with [0xff 0xff] therefore copies 4094
device-provided bytes into a buffer allocated for 1516 bytes,
exceeding its requested size by 2578 bytes.

The next URB then reads dev->partial_len (4094) back from the same
1516-byte buffer and dev->partial_rem (65535 - 4094 = 61441) from
the new URB's ~4KB skb, both well past their allocations, and
delivers the spliced result as a 64KB "frame" to the network
stack.

Bail out of rx_fixup after scheduling the re-enable work; the
remainder of a reboot-marker URB is not meaningful packet data.
This restores the invariant that partial_len < CX82310_MTU + 2 on
the save path, since every other route there has already passed
the MTU check.

## Remediation

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