netfilter: ctnetlink: ignore explicit helper on new expectations

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Summary

CVECVE-2026-43025
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:46 UTC
Updated2026-05-03 07:16:22 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

EPSS: 0.000240000 probability, percentile 0.068220000 (date 2026-05-02)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
3.1CNADECLARED7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bd0779370588386e4a67ba5d0b176cfded8e6a53 e135f8e8212cbed12a03ab8dec77fa1247139897 git Not specified
CNA Linux Linux affected bd0779370588386e4a67ba5d0b176cfded8e6a53 2ea0f35f235f70c133ad61fe05ba013753b978c6 git Not specified
CNA Linux Linux affected bd0779370588386e4a67ba5d0b176cfded8e6a53 0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd git Not specified
CNA Linux Linux affected bd0779370588386e4a67ba5d0b176cfded8e6a53 187b6ec5229ea93cb04c4f6d3b52efc80f513d0d git Not specified
CNA Linux Linux affected bd0779370588386e4a67ba5d0b176cfded8e6a53 21a04c31db4057deec85fcd6cc63d720b38819c3 git Not specified
CNA Linux Linux affected bd0779370588386e4a67ba5d0b176cfded8e6a53 917b61fa2042f11e2af4c428e43f08199586633a git Not specified
CNA Linux Linux affected 3.12 Not specified
CNA Linux Linux unaffected 3.12 semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/187b6ec5229ea93cb04c4f6d3b52efc80f513d0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2ea0f35f235f70c133ad61fe05ba013753b978c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/21a04c31db4057deec85fcd6cc63d720b38819c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e135f8e8212cbed12a03ab8dec77fa1247139897 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/917b61fa2042f11e2af4c428e43f08199586633a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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