CVE-2026-43025

HIGH EPSS 2.6%
Published May 1, 20262mo ago · Modified Jun 17, 20262w ago
7.3 CVSS 3.1
High
Find Similar
Published May 1, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
7.3
Exploitability
1.8
Impact
5.5
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity Low
Availability High

Threat Intelligence

EPSS Exploit Probability
2.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥3.12  –  <6.1.168
linuxlinux_kernel*≥6.2  –  <6.6.134
linuxlinux_kernel*≥6.7  –  <6.12.81
linuxlinux_kernel*≥6.13  –  <6.18.22
linuxlinux_kernel*≥6.19  –  <6.19.12
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 6

  • git.kernel.org https://git.kernel.org/stable/c/0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/187b6ec5229ea93cb04c4f6d3b52efc80f513d0d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/21a04c31db4057deec85fcd6cc63d720b38819c3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2ea0f35f235f70c133ad61fe05ba013753b978c6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/917b61fa2042f11e2af4c428e43f08199586633a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e135f8e8212cbed12a03ab8dec77fa1247139897
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/187b6ec5229ea93cb04c4f6d3b52efc80f513d0d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/21a04c31db4057deec85fcd6cc63d720b38819c3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2ea0f35f235f70c133ad61fe05ba013753b978c6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/917b61fa2042f11e2af4c428e43f08199586633a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e135f8e8212cbed12a03ab8dec77fa1247139897
    Patch