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CVE-2025-40278
net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak
Description

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.

INFO

Published Date :

Dec. 6, 2025, 10:15 p.m.

Last Modified :

Dec. 6, 2025, 10:15 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-40278 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Initialize structure members and padding to prevent memory leaks to userspace.
  • Initialize the struct tc_ife with memset before assigning fields.
  • Ensure all members and padding are cleared.
  • Apply the provided kernel patch.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-40278.

URL Resource
https://git.kernel.org/stable/c/2191662058443e0bcc28d11694293d8339af6dde
https://git.kernel.org/stable/c/37f0680887c5aeba9a433fe04b35169010568bb1
https://git.kernel.org/stable/c/5e3644ef147bf7140259dfa4cace680c9b26fe8b
https://git.kernel.org/stable/c/918e063304f945fb93be9bb70cacea07d0b730ea
https://git.kernel.org/stable/c/a676a296af65d33725bdf7396803180957dbd92e
https://git.kernel.org/stable/c/c8f51dad94cbb88054e2aacc272b3ce1ed11fb1e
https://git.kernel.org/stable/c/ce50039be49eea9b4cd8873ca6eccded1b4a130a
https://git.kernel.org/stable/c/d1dbbbe839647486c9b893e5011fe84a052962df
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-40278 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-40278 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-40278 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-40278 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Dec. 06, 2025

    Action Type Old Value New Value
    Added Description 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.
    Added Reference https://git.kernel.org/stable/c/2191662058443e0bcc28d11694293d8339af6dde
    Added Reference https://git.kernel.org/stable/c/37f0680887c5aeba9a433fe04b35169010568bb1
    Added Reference https://git.kernel.org/stable/c/5e3644ef147bf7140259dfa4cace680c9b26fe8b
    Added Reference https://git.kernel.org/stable/c/918e063304f945fb93be9bb70cacea07d0b730ea
    Added Reference https://git.kernel.org/stable/c/a676a296af65d33725bdf7396803180957dbd92e
    Added Reference https://git.kernel.org/stable/c/c8f51dad94cbb88054e2aacc272b3ce1ed11fb1e
    Added Reference https://git.kernel.org/stable/c/ce50039be49eea9b4cd8873ca6eccded1b4a130a
    Added Reference https://git.kernel.org/stable/c/d1dbbbe839647486c9b893e5011fe84a052962df
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.