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  4. CVE 2026 53001 netfilter xtables restrict several matches to
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Back to active CVEs
Medium · CVSS 5.5CVE-2026-53001

netfilter: xtables: restrict several matches to inet familyCVE-2026-53001

Answer in brief

CVE-2026-53001 records a Medium severity (CVSS 5.5) vulnerability in netfilter: xtables: restrict several matches to inet family. 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.

Published Jun 24, 2026Updated Oct 15, 2026Source checked Oct 23, 2026First seen by HOL Jun 24, 2026Material review Oct 15, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.5
Exploitation
Not marked as known exploited
Affected software
9 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 5.5. 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.

Affected scope and exposure questions

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.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=ab4f21e6fb1c09b13c4c3cb8357babe8223471bd <14203f9edf944b3fb63faadd62f38452421ecdfc || >=ab4f21e6fb1c09b13c4c3cb8357babe8223471bd <7eaf9c740f33230cb224dc265f3c69f8531ff57b || >=ab4f21e6fb1c09b13c4c3cb8357babe8223471bd <9a109751b297b0f2135495749ef5a18ba31ec7d4 || >=ab4f21e6fb1c09b13c4c3cb8357babe8223471bd <cbeb259f31382de70a70a59ffd0e66f5e80d9818 || >=ab4f21e6fb1c09b13c4c3cb8357babe8223471bd <689a91ff18d6448d94c1ab7c076fecdb2b668bef || >=ab4f21e6fb1c09b13c4c3cb8357babe8223471bd <76160e04440c9698b989dbd9492a7ec4f520c9ee || >=ab4f21e6fb1c09b13c4c3cb8357babe8223471bd <fa88161ef56e29bdaa05cc89dbc4ee221e94bfe9 || >=ab4f21e6fb1c09b13c4c3cb8357babe8223471bd <b6fe26f86a1649f84e057f3f15605b08eda1549714203f9edf944b3fb63faadd62f38452421ecdfc, 7eaf9c740f33230cb224dc265f3c69f8531ff57b, 9a109751b297b0f2135495749ef5a18ba31ec7d4, cbeb259f31382de70a70a59ffd0e66f5e80d9818, 689a91ff18d6448d94c1ab7c076fecdb2b668bef, 76160e04440c9698b989dbd9492a7ec4f520c9ee, fa88161ef56e29bdaa05cc89dbc4ee221e94bfe9, b6fe26f86a1649f84e057f3f15605b08eda15497
Linux/Linuxgeneric2.6.28Not reported
Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.6 <**
Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.7 <**
Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric>=V3.1.6 <**
Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric>=V3.1.7 <**
Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.6 <**
Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.7 <**

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP.
  2. 2Review the reported fix. Update Linux/Linux to 14203f9edf944b3fb63faadd62f38452421ecdfc; Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP to *; Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFP to *; Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFP to * if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Jun 24, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jun 24, 2026

Sources and claim methodology

  • Source referencecert-portal.siemens.com
  • Source referencecert-portal.siemens.com
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xtables: restrict several matches to inet family This is a partial revert of: commit ab4f21e6fb1c ("netfilter: xtables: use NFPROTO_UNSPEC in more extensions") to allow ipv4 and ipv6 only. - xt_mac - xt_owner - xt_physdev These extensions are not used by ebtables in userspace. Moreover, xt_realm is only for ipv4, since dst->tclassid is ipv4 specific.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
NVD-CWE-noinfo
Source
CVE List V5
Source checked
Oct 23, 2026
References
10 linked sources
Open source record