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 0.0001
EPSS Percentile 2.4%
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 (20)
Linux/Linux < 4.19
Linux/Linux 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e - 1091b3c174441a52fdbb92e2fe00338f9371a91c
Linux/Linux 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e - 4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3
Linux/Linux 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e - 71a3eda7e850ae844cb8993065f4e410c11a46ce
Linux/Linux 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e - 903c3405cfcc7700260e456ab66a5867586c9e69
Linux/Linux 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e - 906997ea3766c24fbbf9cc4bf17c047315bbd138
Linux/Linux 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e - d6db08484c6cb3d4ad696246f9d288eceba2a078
Linux/Linux 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e - e35f5195cd44ff4053fbc5d71ea97681728a0099
Linux/Linux 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e - e6e3eb5ee89ac4c163d46429391c889a1bb5e404
Linux/Linux 4.19
... and 10 more
Published May 01, 2026
Tracked Since May 01, 2026