CVE-2026-43028 (GCVE-0-2026-43028)
Vulnerability from cvelistv5
Published
2026-05-01 14:15
Modified
2026-10-19 19:06
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: ensure names are nul-terminated Reject names that lack a \0 character before feeding them to functions that expect c-strings. Fixes tag is the most recent commit that needs this change.
References
Impacted products
Vendor Product Version
Linux Linux Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
Version: c38c4597e4bf3e99860eac98211748e1ecb0e139
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      "containers": "{\"adp\": [{\"affected\": [{\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-082556.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-457936.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-10-15T01:18:42.896Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-43028\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T15:13:40.652686Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-170\", \"description\": \"CWE-170 Improper Null Termination\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:13:41.205Z\"}}], \"cna\": {\"title\": \"netfilter: x_tables: ensure names are nul-terminated\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.1, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerable x_tables match validation is reached by local rule creation paths such as iptables setsockopt table replacement or nft_compat netlink rule creation, not by received network packets.\\nAC:L - A local attacker can deterministically submit a crafted match blob with a non-NUL-terminated cgroup path or rateest name; no race or victim state is required.\\nPR:L - The path requires CAP_NET_ADMIN in the target network namespace, but netfilter administration is reachable by an unprivileged user through user and network namespaces on systems allowing unprivileged user namespaces.\\nUI:N - After obtaining the local namespace privileges, the attacker directly invokes the rule insertion path without any victim action.\\nS:U - The issue affects kernel netfilter processing within the same host kernel security authority and does not cross a VM, hypervisor, or separate security scope boundary.\\nC:H - The bug feeds attacker-controlled fixed-size fields lacking a NUL terminator into C-string consumers, and affected kernels can read past the intended match field into adjacent kernel memory until a NUL is found. Because this out-of-bounds read is not strictly bounded to only a few bytes across affected versions, confidentiality is scored High.\\nI:N - The investigated paths show an out-of-bounds read/string validation failure during rule validation, with no write primitive or control-flow modification identified.\\nA:H - The unterminated C-string scan can run beyond the allocated rule data and fault or oops the kernel, producing a local denial of service that can be triggered repeatedly.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"c38c4597e4bf3e99860eac98211748e1ecb0e139\", \"lessThan\": \"bcac50ea0a29d430eedc5ac87b215393b567baa9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c38c4597e4bf3e99860eac98211748e1ecb0e139\", \"lessThan\": \"ea01c1b219f5a11c66918abaa6f052e5a74041d6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c38c4597e4bf3e99860eac98211748e1ecb0e139\", \"lessThan\": \"aa6cd4a8863391e0a64f62d8922cb0af732a2cf2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c38c4597e4bf3e99860eac98211748e1ecb0e139\", \"lessThan\": \"c2d4a3abb15ca14716c6d8b9ffcbcd7c63626af4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c38c4597e4bf3e99860eac98211748e1ecb0e139\", \"lessThan\": \"673bbd36cba21d10a10f0932f479df7468e26fbb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c38c4597e4bf3e99860eac98211748e1ecb0e139\", \"lessThan\": \"f419bdc205894750f4d3ec042bc87a1b9cde1351\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c38c4597e4bf3e99860eac98211748e1ecb0e139\", \"lessThan\": \"73124608172890306b85f2206d8b3cac20e324f1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c38c4597e4bf3e99860eac98211748e1ecb0e139\", \"lessThan\": \"a958a4f90ddd7de0800b33ca9d7b886b7d40f74e\", \"versionType\": \"git\"}], \"programFiles\": [\"net/netfilter/xt_cgroup.c\", \"net/netfilter/xt_rateest.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.253\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.203\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"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/xt_cgroup.c\", \"net/netfilter/xt_rateest.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/bcac50ea0a29d430eedc5ac87b215393b567baa9\"}, {\"url\": \"https://git.kernel.org/stable/c/ea01c1b219f5a11c66918abaa6f052e5a74041d6\"}, {\"url\": \"https://git.kernel.org/stable/c/aa6cd4a8863391e0a64f62d8922cb0af732a2cf2\"}, {\"url\": \"https://git.kernel.org/stable/c/c2d4a3abb15ca14716c6d8b9ffcbcd7c63626af4\"}, {\"url\": \"https://git.kernel.org/stable/c/673bbd36cba21d10a10f0932f479df7468e26fbb\"}, {\"url\": \"https://git.kernel.org/stable/c/f419bdc205894750f4d3ec042bc87a1b9cde1351\"}, {\"url\": \"https://git.kernel.org/stable/c/73124608172890306b85f2206d8b3cac20e324f1\"}, {\"url\": \"https://git.kernel.org/stable/c/a958a4f90ddd7de0800b33ca9d7b886b7d40f74e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: x_tables: ensure names are nul-terminated\\n\\nReject names that lack a \\\\0 character before feeding them\\nto functions that expect c-strings.\\n\\nFixes tag is the most recent commit that needs this change.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.253\", \"versionStartIncluding\": \"4.5\"}, {\"criteria\": 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\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"4.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:25:21.789Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-43028\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:06:10.219Z\", \"dateReserved\": \"2026-05-01T14:12:55.976Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-01T14:15:29.192Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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