5.5

CVE-2026-43035: linux Use of Uninitialized Resource

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2026-43035DEBIAN-CVE-2026-43035
Published 01-05-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-43035 is a medium (CVSS 5.5) Use of Uninitialized Resource vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 41 · Related 39
MGASA-2026-0108MGASA-2026-0110OPENSUSE-SU-2026:21388-1SUSE-SU-2026:22433-1SUSE-SU-2026:22436-1SUSE-SU-2026:22458-1

Timeline

  1. 01-05-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.13%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu153 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e, < 903c3405cfcc7700260e456ab66a5867586c9e69 | ≥ 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e, < 71a3eda7e850ae844cb8993065f4e410c11a46ce | ≥ 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e, < 4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3 | ≥ 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e, < e35f5195cd44ff4053fbc5d71ea97681728a0099 | ≥ 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e, < d6db08484c6cb3d4ad696246f9d288eceba2a078 | ≥ 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e, < 906997ea3766c24fbbf9cc4bf17c047315bbd138 | ≥ 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e, < 1091b3c174441a52fdbb92e2fe00338f9371a91c | ≥ 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e, < e6e3eb5ee89ac4c163d46429391c889a1bb5e404 | 4.19
  • linux_kernel≥ 4.19, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.168 | ≥ 6.2, < 6.6.134 | ≥ 6.7, < 6.12.81 | ≥ 6.13, < 6.18.22 | ≥ 6.19, < 6.19.12 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.12-1

3 vendors · 156 products

References

42 links
Show all 42 references