CVE-2026-31414

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The ctnetlink expectation path holds the reference on the\nmaster conntrack and nf_conntrack_expect lock and the nfnetlink glue\npath refers to the master ct that is attached to the skb."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable helper lookup is reachable from packet-processing paths such as the SIP conntrack helper when network traffic creates and collides with expectations. A remote peer can drive SIP/SDP traffic through a reasonably configured firewall/router using this helper.\nAC:L - The race/lifetime window can be exercised by repeatedly creating and tearing down related conntrack expectations, which the attacker can influence through controlled traffic. No rare, attacker-uncontrolled condition is required beyond the affected helper being enabled.\nPR:N - The network packet path does not require local credentials or capabilities. Although ctnetlink and proc dump paths are local and capability-gated, the SIP helper path gives a no-privilege remote trigger.\nUI:N - Exploitation does not require a victim user to perform an action. The attacker only needs to send crafted traffic or local netlink/proc requests in the relevant scenario.\nS:U - The vulnerability is in the kernel networking subsystem and impacts kernel resources under the same security authority. It is not a VM escape, IOMMU bypass, or cross-scope isolation break by itself.\nC:H - The bug is a stale use of the master conntrack/helper state, allowing kernel heap use-after-free reads through helper pointers. Under the required conservative scoring rule, this can expose arbitrary kernel memory.\nI:H - Use-after-free in kernel heap objects can be shaped with heap spraying and may be leveraged beyond the immediate stale read. Under the required conservative scoring rule, kernel memory corruption is treated as high integrity impact.\nA:H - Invalid or attacker-shaped stale helper pointers can cause kernel oops or panic during packet processing, netlink dumps, event delivery, or proc reads. This provides a high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nf_conntrack_expect.c", "net/netfilter/nf_conntrack_helper.c", "net/netfilter/nf_conntrack_netlink.c", "net/netfilter/nf_conntrack_sip.c"], "versions": [{"version": "ea781f197d6a835cbb93a0bf88ee1696296ed8aa", "lessThan": "847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781", "status": "affected", "versionType": "git"}, {"version": "ea781f197d6a835cbb93a0bf88ee1696296ed8aa", "lessThan": "e7ccaa0a62a8ff2be5d521299ce79390c318d306", "status": "affected", "versionType": "git"}, {"version": "ea781f197d6a835cbb93a0bf88ee1696296ed8aa", "lessThan": "4bd1b3d839172724b33d8d02c5a4ff6a1c775417", "status": "affected", "versionType": "git"}, {"version": "ea781f197d6a835cbb93a0bf88ee1696296ed8aa", "lessThan": "b53294bff19e56ada2f230ceb8b1ffde61cc3817", "status": "affected", 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"semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781"}, {"url": "https://git.kernel.org/stable/c/e7ccaa0a62a8ff2be5d521299ce79390c318d306"}, {"url": "https://git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417"}, {"url": "https://git.kernel.org/stable/c/b53294bff19e56ada2f230ceb8b1ffde61cc3817"}, {"url": "https://git.kernel.org/stable/c/3dfd3f7712b5a800f2ba632179e9b738076a51f0"}, {"url": "https://git.kernel.org/stable/c/f01794106042ee27e54af6fdf5b319a2fe3df94d"}], "title": "netfilter: nf_conntrack_expect: use 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It is not a VM escape, IOMMU bypass, or cross-scope isolation break by itself.\nC:H - The bug is a stale use of the master conntrack/helper state, allowing kernel heap use-after-free reads through helper pointers. Under the required conservative scoring rule, this can expose arbitrary kernel memory.\nI:H - Use-after-free in kernel heap objects can be shaped with heap spraying and may be leveraged beyond the immediate stale read. Under the required conservative scoring rule, kernel memory corruption is treated as high integrity impact.\nA:H - Invalid or attacker-shaped stale helper pointers can cause kernel oops or panic during packet processing, netlink dumps, event delivery, or proc reads. 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The ctnetlink expectation path holds the reference on the\nmaster conntrack and nf_conntrack_expect lock and the nfnetlink glue\npath refers to the master ct that is attached to the skb."}], "id": "CVE-2026-31414", "lastModified": "2026-11-10T13:18:51.847", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31414", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:09:06.034181Z", "version": "2.0.3"}}]}, "published": "2026-04-13T14:16:10.537", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3dfd3f7712b5a800f2ba632179e9b738076a51f0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b53294bff19e56ada2f230ceb8b1ffde61cc3817"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e7ccaa0a62a8ff2be5d521299ce79390c318d306"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f01794106042ee27e54af6fdf5b319a2fe3df94d"}, {"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"}, {"description": [{"lang": "en", "value": "CWE-476"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: netfilter: nf_conntrack_expect: use expect->helper", "id": "2457830", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457830"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-31414", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31414\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31414\nhttps://lore.kernel.org/linux-cve-announce/2026041308-CVE-2026-31414-90e7@gregkh/T"], "threat_severity": "Moderate"}

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