Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 3.12, < 6.1.168 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cdPatch
- https://git.kernel.org/stable/c/187b6ec5229ea93cb04c4f6d3b52efc80f513d0dPatch
- https://git.kernel.org/stable/c/21a04c31db4057deec85fcd6cc63d720b38819c3Patch
- https://git.kernel.org/stable/c/2ea0f35f235f70c133ad61fe05ba013753b978c6Patch
- https://git.kernel.org/stable/c/917b61fa2042f11e2af4c428e43f08199586633aPatch
- https://git.kernel.org/stable/c/e135f8e8212cbed12a03ab8dec77fa1247139897Patch
FAQ
What is CVE-2026-43025?
CVE-2026-43025 is a vulnerability with a CVSS score of 7.3 (HIGH). 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 re...
How severe is CVE-2026-43025?
CVE-2026-43025 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43025?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.