CVE-2026-31496

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"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "46B94C77-721A-426C-93DF-A9C494E34051", "versionEndExcluding": "6.1.168", "versionStartIncluding": "2.6.28.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CE6ED4D4-0046-4573-BFA9-D64143B6A89F", "versionEndExcluding": "6.6.131", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "97EB19EC-A11E-49C6-9D2F-6F6EC6CB98B6", "versionEndExcluding": "6.12.80", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "ED39847A-3B46-4729-B7CA-B2C30B9FA8FE", "versionEndExcluding": "6.18.21", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "4CA2E747-A9EC-4518-9AA2-B4247FC748B7", "versionEndExcluding": "6.19.11", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.28:-:*:*:*:*:*:*", "matchCriteriaId": "E49D2BB3-E71B-45D6-967F-8DEBCF7CEDB0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_expect: skip expectations in other netns via proc\n\nSkip expectations that do not reside in this netns.\n\nSimilar to e77e6ff502ea (\"netfilter: conntrack: do not dump other netns's\nconntrack entries via proc\")."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: nf_conntrack_expect: omitir expectativas en otros netns v\u00eda proc\n\nOmitir expectativas que no residen en este netns.\n\nSimilar a e77e6ff502ea (\u2019netfilter: conntrack: no volcar entradas de conntrack de otros netns v\u00eda proc\u2019)."}], "id": "CVE-2026-31496", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31496", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:35:29.741416Z", "version": "2.0.3"}}]}, "published": "2026-04-22T14:16:47.693", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/168145c87444619e3e649322bbe7719ecd00d411"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2028405ea6987b4448784e439413202cfe19f43f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3265ad619987cb551edaf797ed056d80ac450225"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3db5647984de03d9cae0dcddb509b058351f0ee4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9ca8c7452493d915f9bbf2f39331e6c583d07a23"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dcfcd95b3ae7683e8ae55c92284b3430ce614bc7"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: netfilter: nf_conntrack_expect: skip expectations in other netns via proc", "id": "2460701", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460701"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-653", "details": ["A flaw was found in the Linux kernel's netfilter subsystem. This vulnerability allows a local user to potentially access or view network connection tracking expectations (`nf_conntrack_expect`) from other network namespaces (`netns`) via the `/proc` filesystem. This could lead to information disclosure or a bypass of network isolation, compromising the intended separation between different network environments."], "name": "CVE-2026-31496", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31496\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31496\nhttps://lore.kernel.org/linux-cve-announce/2026042203-CVE-2026-31496-e130@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9b03f38d0487f3908696242286d934c9b38f9d2a,2028405ea6987b4448784e439413202cfe19f43f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9b03f38d0487f3908696242286d934c9b38f9d2a,168145c87444619e3e649322bbe7719ecd00d411)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9b03f38d0487f3908696242286d934c9b38f9d2a,dcfcd95b3ae7683e8ae55c92284b3430ce614bc7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9b03f38d0487f3908696242286d934c9b38f9d2a,9ca8c7452493d915f9bbf2f39331e6c583d07a23)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9b03f38d0487f3908696242286d934c9b38f9d2a,3265ad619987cb551edaf797ed056d80ac450225)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9b03f38d0487f3908696242286d934c9b38f9d2a,3db5647984de03d9cae0dcddb509b058351f0ee4)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.28"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,2.6.28)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.168,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.131,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.80,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.21,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.11,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "analysis": {"en": {"generated_at": "2026-04-29T00:04:32.378535+00:00", "value": {"mitigation_remediation": ["Apply the latest Linux kernel update that contains the nf_conntrack_expect patch", "If a kernel update cannot be applied immediately, unload the nf_conntrack_expect module so that its /proc entries are no longer exposed", "Limit read access to the /proc netfilter directory by ensuring that only privileged or trusted users can read the files and by tightening policies that govern network-namespace administration"], "summary": {"action": "Update Kernel", "impact": "Information Disclosure via /proc of other network namespaces"}, "threat_synthesis": {"affected_systems": "The flaw is present in the Linux kernel\u2019s nf_conntrack_expect component across many releases, as indicated by the CPE strings covering all modern kernel versions including 2.6.28 and the 7.0 release candidates. Any Linux system running a kernel that includes this module and has /proc exposed to local users is at risk. The CNA indicates the vendor as Linux:Linux, implying all distributions that ship the default kernel are affected unless the kernel is patched or the module is disabled.", "description_and_impact": "The nf_conntrack_expect subsystem in the Linux kernel has a logic flaw that allows any process with read access to the /proc filesystem to enumerate expectations that belong to another network namespace. This results in the exposure of state about cross-namespace connections, revealing sensitive traffic patterns and potentially allowing an attacker to infer the presence of devices or services in another namespace. The vulnerability is a moderate-severity kernel data-exposure flaw with a CVSS score of 5.5.", "risk_and_exploitability": "The EPSS score is reported as less than 1% and the vulnerability is not listed in the CISA KEV catalog, suggesting low exploitation activity. The attack vector is local \u2013 an adversary must be able to read /proc entries, which typically requires the same privileges as the kernel process or a user granted read access to /proc. The CVSS base score of 5.5 reflects the moderate impact with limited scope. No remote or privilege-escalation vector is documented; the flaw is strictly an information-disclosure problem with local read access as the prerequisite."}}}}, "created": "2026-04-22T17:30:22.456260+00:00", "updated": "2026-04-29T00:15:43.460558+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}