CVE-2026-43035: net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak
In the Linux kernel, the following vulnerability has been resolved:
net: sched: clsapi: fix tcchainfillnode to initialize tcminfo to zero to prevent an info-leak
When building netlink messages, tcchainfillnode() never initializes the tcminfo field of struct tcmsg. Since the allocation is not zeroed, kernel heap memory is leaked to userspace through this 4-byte field.
The fix simply zeroes tcminfo alongside the other fields that are already initialized.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-43035?
CVE-2026-43035 is classified as a medium-severity vulnerability in the Linux kernel.
How do I fix CVE-2026-43035?
To fix CVE-2026-43035, you should apply the latest patches provided by your Linux distribution that addresses this vulnerability.
What type of vulnerability is CVE-2026-43035?
CVE-2026-43035 is an information leak vulnerability related to netlink message construction in the Linux kernel.
Which systems are affected by CVE-2026-43035?
CVE-2026-43035 affects various versions of the Linux kernel that utilize the netlink interface for scheduling.
Who should be concerned about CVE-2026-43035?
System administrators and users of affected Linux kernel versions should be concerned about CVE-2026-43035 due to the potential information leak.