Answer in brief
CVE-2026-43025 records a High severity (CVSS 7.3) vulnerability in netfilter: ctnetlink: ignore explicit helper on new expectations. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-43025 records a High severity (CVSS 7.3) vulnerability in netfilter: ctnetlink: ignore explicit helper on new expectations. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=bd0779370588386e4a67ba5d0b176cfded8e6a53 <e135f8e8212cbed12a03ab8dec77fa1247139897 || >=bd0779370588386e4a67ba5d0b176cfded8e6a53 <2ea0f35f235f70c133ad61fe05ba013753b978c6 || >=bd0779370588386e4a67ba5d0b176cfded8e6a53 <0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd || >=bd0779370588386e4a67ba5d0b176cfded8e6a53 <187b6ec5229ea93cb04c4f6d3b52efc80f513d0d || >=bd0779370588386e4a67ba5d0b176cfded8e6a53 <21a04c31db4057deec85fcd6cc63d720b38819c3 || >=bd0779370588386e4a67ba5d0b176cfded8e6a53 <917b61fa2042f11e2af4c428e43f08199586633a | e135f8e8212cbed12a03ab8dec77fa1247139897, 2ea0f35f235f70c133ad61fe05ba013753b978c6, 0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd, 187b6ec5229ea93cb04c4f6d3b52efc80f513d0d, 21a04c31db4057deec85fcd6cc63d720b38819c3, 917b61fa2042f11e2af4c428e43f08199586633a |
| Linux/Linuxgeneric | 3.12 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
May 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=bd0779370588386e4a67ba5d0b176cfded8e6a53 <e135f8e8212cbed12a03ab8dec77fa1247139897 || >=bd0779370588386e4a67ba5d0b176cfded8e6a53 <2ea0f35f235f70c133ad61fe05ba013753b978c6 || >=bd0779370588386e4a67ba5d0b176cfded8e6a53 <0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd || >=bd0779370588386e4a67ba5d0b176cfded8e6a53 <187b6ec5229ea93cb04c4f6d3b52efc80f513d0d || >=bd0779370588386e4a67ba5d0b176cfded8e6a53 <21a04c31db4057deec85fcd6cc63d720b38819c3 || >=bd0779370588386e4a67ba5d0b176cfded8e6a53 <917b61fa2042f11e2af4c428e43f08199586633a | e135f8e8212cbed12a03ab8dec77fa1247139897, 2ea0f35f235f70c133ad61fe05ba013753b978c6, 0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd, 187b6ec5229ea93cb04c4f6d3b52efc80f513d0d, 21a04c31db4057deec85fcd6cc63d720b38819c3, 917b61fa2042f11e2af4c428e43f08199586633a |
| Linux/Linuxgeneric | 3.12 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
May 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.