---
id: CVE-2025-40278
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak

  Fix a KMSAN kernel-infoleak detected  by the syzbot .

  [net?] KMSAN: kernel-infoleak in __sk…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak

  Fix a KMSAN kernel-infoleak detected  by the syzbot .

  [net?] KMSAN: kernel-infoleak in __sk…
severity: none
published: '2025-12-06'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T19:10:00.173'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-40278'
references:
  - url: 'https://git.kernel.org/stable/c/2191662058443e0bcc28d11694293d8339af6dde'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/37f0680887c5aeba9a433fe04b35169010568bb1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5e3644ef147bf7140259dfa4cace680c9b26fe8b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/918e063304f945fb93be9bb70cacea07d0b730ea'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a676a296af65d33725bdf7396803180957dbd92e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c8f51dad94cbb88054e2aacc272b3ce1ed11fb1e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ce50039be49eea9b4cd8873ca6eccded1b4a130a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d1dbbbe839647486c9b893e5011fe84a052962df'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-253495.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.00218
epssPercentile: 0.11365
ingestedAt: '2026-10-15T19:25:46.333Z'
---

## Overview

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

net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak

Fix a KMSAN kernel-infoleak detected  by the syzbot .

[net?] KMSAN: kernel-infoleak in __skb_datagram_iter

In tcf_ife_dump(), the variable 'opt' was partially initialized using a
designatied initializer. While the padding bytes are reamined
uninitialized. nla_put() copies the entire structure into a
netlink message, these uninitialized bytes leaked to userspace.

Initialize the structure with memset before assigning its fields
to ensure all members and padding are cleared prior to beign copied.

This change silences the KMSAN report and prevents potential information
leaks from the kernel memory.

This fix has been tested and validated by syzbot. This patch closes the
bug reported at the following syzkaller link and ensures no infoleak.

## Remediation

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