netfilter: ctnetlink: ignore explicit helper on new expectations
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.
CVE-2026-43025
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-43025
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "bd0779370588386e4a67ba5d0b176cfded8e6a53",
"lessThan": "e135f8e8212cbed12a03ab8dec77fa1247139897",
"versionType": "git"
},
{
"status": "affected",
"version": "bd0779370588386e4a67ba5d0b176cfded8e6a53",
"lessThan": "2ea0f35f235f70c133ad61fe05ba013753b978c6",
"versionType": "git"
},
{
"status": "affected",
"version": "bd0779370588386e4a67ba5d0b176cfded8e6a53",
"lessThan": "0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd",
"versionType": "git"
},
{
"status": "affected",
"version": "bd0779370588386e4a67ba5d0b176cfded8e6a53",
"lessThan": "187b6ec5229ea93cb04c4f6d3b52efc80f513d0d",
"versionType": "git"
},
{
"status": "affected",
"version": "bd0779370588386e4a67ba5d0b176cfded8e6a53",
"lessThan": "21a04c31db4057deec85fcd6cc63d720b38819c3",
"versionType": "git"
},
{
"status": "affected",
"version": "bd0779370588386e4a67ba5d0b176cfded8e6a53",
"lessThan": "917b61fa2042f11e2af4c428e43f08199586633a",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nf_conntrack_netlink.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.134",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.81",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.22",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.12",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nf_conntrack_netlink.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43025
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40003 · Revision 1
- Added to Heist Feed
- Publisher date