CVE-2026-43025 Details
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: ignore explicit helper on new expectations Use the existing master conntrack helper, anything else is not really supported and it just makes validation more complicated, so just ignore what helper userspace suggests for this expectation. This was uncovered when validating CTA_EXPECT_CLASS via different helper provided by userspace than the existing master conntrack helper: BUG: KASAN: slab-out-of-bounds in nf_ct_expect_related_report+0x2479/0x27c0 Read of size 4 at addr ffff8880043fe408 by task poc/102 Call Trace: nf_ct_expect_related_report+0x2479/0x27c0 ctnetlink_create_expect+0x22b/0x3b0 ctnetlink_new_expect+0x4bd/0x5c0 nfnetlink_rcv_msg+0x67a/0x950 netlink_rcv_skb+0x120/0x350 Allowing to read kernel memory bytes off the expectation boundary. CTA_EXPECT_HELP_NAME is still used to offer the helper name to userspace via netlink dump.
A vulnerability in the Linux kernel's netfilter component can lead to a out-of-bounds memory read. This issue arises in the conntrack netlink handling, where user-specified helpers for expectations are incorrectly validated. The vulnerability allows reading kernel memory beyond the expected boundaries, potentially leading to information disclosure or other impacts. The issue was discovered during validation of expectation classes, where a different user-provided helper caused a slab-out-of-bounds error, allowing unauthorized memory access.
Users can update to the latest stable version of the Linux kernel, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://cert-portal.siemens.com/productcert/html/ssa-019113.html | siemens-SADP | |
| https://cert-portal.siemens.com/productcert/html/ssa-082556.html | siemens-SADP | |
| https://git.kernel.org/stable/c/0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd | kernel.org | Patch |
| https://git.kernel.org/stable/c/187b6ec5229ea93cb04c4f6d3b52efc80f513d0d | kernel.org | Patch |
| https://git.kernel.org/stable/c/21a04c31db4057deec85fcd6cc63d720b38819c3 | kernel.org | Patch |
| https://git.kernel.org/stable/c/2ea0f35f235f70c133ad61fe05ba013753b978c6 | kernel.org | Patch |
| https://git.kernel.org/stable/c/917b61fa2042f11e2af4c428e43f08199586633a | kernel.org | Patch |
| https://git.kernel.org/stable/c/e135f8e8212cbed12a03ab8dec77fa1247139897 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 3.12, < 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 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | CVE Modified | siemens-SADP |
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 8, 2026 | Initial Analysis | [email protected] |
| May 3, 2026 | CVE Modified | kernel.org |
| May 1, 2026 | New CVE Received | kernel.org |