CVE-2025-40279
net: sched: act_connmark: initialize struct tc_ife to fix kernel leak
Description
In the Linux kernel, the following vulnerability has been resolved: net: sched: act_connmark: initialize struct tc_ife to fix kernel leak In tcf_connmark_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.
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
Solution
- Initialize the tc_ife structure with memset.
- Ensure all members and padding are cleared.
- Apply kernel updates addressing this issue.
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-2025-40279.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-40279 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-2025-40279
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-2025-40279 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-40279 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_connmark: initialize struct tc_ife to fix kernel leak In tcf_connmark_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. Added Reference https://git.kernel.org/stable/c/218b67c8c8246d47a2a7910eae80abe4861fe2b7 Added Reference https://git.kernel.org/stable/c/25837889ec062f2b7618142cd80253dff3da5343 Added Reference https://git.kernel.org/stable/c/31e4aa93e2e5b5647fc235b0f6ee329646878f9e Added Reference https://git.kernel.org/stable/c/51cb05d4fd632596816ba44e882e84db9fb28a7e Added Reference https://git.kernel.org/stable/c/62b656e43eaeae445a39cd8021a4f47065af4389 Added Reference https://git.kernel.org/stable/c/73cc56c608c209d3d666cc571293b090a471da70