---
id: CVE-2025-38441
title: 'netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto()

  syzbot found a potential access to uninit-value in nf_flow_pppoe_proto()

  Blamed commit forg…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d06977b9a4109f8738bb276125eb6a0b772bc433 <
    a3aea97d55964e70a1e6426aa4cafdc036e8a2dd
  - >-
    Linux >= 8bf7c76a2a207ca2b4cfda0a279192adf27678d7 <
    eed8960b289327235185b7c32649c3470a3e969b
  - >-
    Linux >= a2471d271042ea18e8a6babc132a8716bb2f08b9 <
    9fbc49429a23b02595ba82536c5ea425fdabb221
  - >-
    Linux >= 87b3593bed1868b2d9fe096c01bcdf0ea86cbebf <
    e0dd2e9729660f3f4fcb16e0aef87342911528ef
  - >-
    Linux >= 87b3593bed1868b2d9fe096c01bcdf0ea86cbebf <
    cfbf0665969af2c69d10c377d4c3d306e717efb4
  - >-
    Linux >= 87b3593bed1868b2d9fe096c01bcdf0ea86cbebf <
    18cdb3d982da8976b28d57691eb256ec5688fad2
  - Linux cf366ee3bc1b7d1c76a882640ba3b3f8f1039163
  - Linux >= 5.15.157 < 5.15.189
  - Linux >= 6.1.88 < 6.1.146
  - Linux >= 6.6.29 < 6.6.99
  - Linux >= 6.8.8 < 6.9
  - Linux 6.9
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:56:41.567168Z'
published: '2025-07-25'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:02:38.282Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-38441'
references:
  - url: 'https://git.kernel.org/stable/c/a3aea97d55964e70a1e6426aa4cafdc036e8a2dd'
  - url: 'https://git.kernel.org/stable/c/eed8960b289327235185b7c32649c3470a3e969b'
  - url: 'https://git.kernel.org/stable/c/9fbc49429a23b02595ba82536c5ea425fdabb221'
  - url: 'https://git.kernel.org/stable/c/e0dd2e9729660f3f4fcb16e0aef87342911528ef'
  - url: 'https://git.kernel.org/stable/c/cfbf0665969af2c69d10c377d4c3d306e717efb4'
  - url: 'https://git.kernel.org/stable/c/18cdb3d982da8976b28d57691eb256ec5688fad2'
tags:
  - cve.org
epss: 0.00192
epssPercentile: 0.08927
ingestedAt: '2026-11-05T22:38:31.970Z'
---

## Overview

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

netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto()

syzbot found a potential access to uninit-value in nf_flow_pppoe_proto()

Blamed commit forgot the Ethernet header.

BUG: KMSAN: uninit-value in nf_flow_offload_inet_hook+0x7e4/0x940 net/netfilter/nf_flow_table_inet.c:27
  nf_flow_offload_inet_hook+0x7e4/0x940 net/netfilter/nf_flow_table_inet.c:27
  nf_hook_entry_hookfn include/linux/netfilter.h:157 [inline]
  nf_hook_slow+0xe1/0x3d0 net/netfilter/core.c:623
  nf_hook_ingress include/linux/netfilter_netdev.h:34 [inline]
  nf_ingress net/core/dev.c:5742 [inline]
  __netif_receive_skb_core+0x4aff/0x70c0 net/core/dev.c:5837
  __netif_receive_skb_one_core net/core/dev.c:5975 [inline]
  __netif_receive_skb+0xcc/0xac0 net/core/dev.c:6090
  netif_receive_skb_internal net/core/dev.c:6176 [inline]
  netif_receive_skb+0x57/0x630 net/core/dev.c:6235
  tun_rx_batched+0x1df/0x980 drivers/net/tun.c:1485
  tun_get_user+0x4ee0/0x6b40 drivers/net/tun.c:1938
  tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1984
  new_sync_write fs/read_write.c:593 [inline]
  vfs_write+0xb4b/0x1580 fs/read_write.c:686
  ksys_write fs/read_write.c:738 [inline]
  __do_sys_write fs/read_write.c:749 [inline]

## Affected

- `Linux >= d06977b9a4109f8738bb276125eb6a0b772bc433 < a3aea97d55964e70a1e6426aa4cafdc036e8a2dd`
- `Linux >= 8bf7c76a2a207ca2b4cfda0a279192adf27678d7 < eed8960b289327235185b7c32649c3470a3e969b`
- `Linux >= a2471d271042ea18e8a6babc132a8716bb2f08b9 < 9fbc49429a23b02595ba82536c5ea425fdabb221`
- `Linux >= 87b3593bed1868b2d9fe096c01bcdf0ea86cbebf < e0dd2e9729660f3f4fcb16e0aef87342911528ef`
- `Linux >= 87b3593bed1868b2d9fe096c01bcdf0ea86cbebf < cfbf0665969af2c69d10c377d4c3d306e717efb4`
- `Linux >= 87b3593bed1868b2d9fe096c01bcdf0ea86cbebf < 18cdb3d982da8976b28d57691eb256ec5688fad2`
- `Linux cf366ee3bc1b7d1c76a882640ba3b3f8f1039163`
- `Linux >= 5.15.157 < 5.15.189`
- `Linux >= 6.1.88 < 6.1.146`
- `Linux >= 6.6.29 < 6.6.99`
- `Linux >= 6.8.8 < 6.9`
- `Linux 6.9`

## Remediation

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