CVE-2026-43035

MEDIUM

net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak

Title source: cna
STIX 2.1

Description

In the Linux kernel, the following vulnerability has been resolved: net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak When building netlink messages, tc_chain_fill_node() never initializes the tcm_info 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 tcm_info alongside the other fields that are already initialized.

Scores

CVSS v3 5.5
EPSS 0.0013
EPSS Percentile 2.9%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-908
Status published
Products (27)
linux/Kernel 4.19.0 - 5.10.253linux
linux/Kernel 5.11.0 - 5.15.203linux
linux/Kernel 5.16.0 - 6.1.168linux
linux/Kernel 6.13.0 - 6.18.22linux
linux/Kernel 6.19.0 - 6.19.12linux
linux/Kernel 6.2.0 - 6.6.134linux
linux/Kernel 6.7.0 - 6.12.81linux
Linux/Linux < 4.19
Linux/Linux 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e - 1091b3c174441a52fdbb92e2fe00338f9371a91c
Linux/Linux 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e - 4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3
... and 17 more
Published May 01, 2026
Tracked Since May 01, 2026