CVE-2026-31685

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For packets with `par->fragoff == 0`, `eui64_mt6()`\ncan still reach `eth_hdr(skb)` even when the MAC header is not valid.\n\nFix this by removing the `par->fragoff != 0` condition so that packets\nwith an invalid MAC header are rejected before accessing `eth_hdr(skb)`."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H", "baseScore": 9.4, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable match runs from IPv6 netfilter PREROUTING/LOCAL_IN/FORWARD packet hooks, so a remote peer can reach it by sending IPv6 traffic to or through a host/router with an active eui64 xtables rule on a path with an invalid or absent Ethernet MAC header.\nAC:L - There is no race or timing requirement; the attacker can send first-fragment or non-fragment IPv6 packets with controlled header fields, and the active rule/interface combination is a deployment precondition.\nPR:N - Although installing the rule requires CAP_NET_ADMIN, in the highest-severity reasonable deployment the eui64 rule is already active and unauthenticated packets trigger the vulnerable packet path without attacker privileges.\nUI:N - No victim action is needed after the affected netfilter rule is present; packet delivery alone invokes the match.\nS:U - The impact remains within the kernel/networking security authority of the affected system and does not cross a VM, IOMMU, or similar boundary.\nC:H - With an unset or invalid MAC header, eth_hdr() can read outside the valid Ethernet header area and those bytes can influence observable netfilter behavior; following the required conservative rule for out-of-bounds reads, confidentiality is High.\nI:L - The bug can cause invalid-L2 packets to satisfy an eui64 match and bypass filtering decisions based on Ethernet-source-to-IPv6-source binding, but it does not provide a direct kernel write primitive.\nA:H - Invalid eth_hdr() access on packets with no valid MAC header can produce kernel warnings/oopses or KASAN-detected out-of-bounds accesses, and an attacker can repeat packet delivery to sustain denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/netfilter/ip6t_eui64.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "4d75bc2cd093bf5803edf512c099bfb220fd6459", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7d6a57411caf54df025860c9b1a82cd42d57a562", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d5603591373441fecf9951833d6d873e09320f08", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "288138418bef956f8b295751a4536c60f0e89f4a", "status": "affected", "versionType": "git"}, 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The vulnerable match runs from IPv6 netfilter PREROUTING/LOCAL_IN/FORWARD packet hooks, so a remote peer can reach it by sending IPv6 traffic to or through a host/router with an active eui64 xtables rule on a path with an invalid or absent Ethernet MAC header.\nAC:L - There is no race or timing requirement; the attacker can send first-fragment or non-fragment IPv6 packets with controlled header fields, and the active rule/interface combination is a deployment precondition.\nPR:N - Although installing the rule requires CAP_NET_ADMIN, in the highest-severity reasonable deployment the eui64 rule is already active and unauthenticated packets trigger the vulnerable packet path without attacker privileges.\nUI:N - No victim action is needed after the affected netfilter rule is present; packet delivery alone invokes the match.\nS:U - The impact remains within the kernel/networking security authority of the affected system and does not cross a VM, IOMMU, or similar boundary.\nC:H - With an unset or invalid MAC header, eth_hdr() can read outside the valid Ethernet header area and those bytes can influence observable netfilter behavior; following the required conservative rule for out-of-bounds reads, confidentiality is High.\nI:L - The bug can cause invalid-L2 packets to satisfy an eui64 match and bypass filtering decisions based on Ethernet-source-to-IPv6-source binding, but it does not provide a direct kernel write primitive.\nA:H - Invalid eth_hdr() access on packets with no valid MAC header can produce kernel warnings/oopses or KASAN-detected out-of-bounds accesses, and an attacker can repeat packet delivery to sustain denial of service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "4d75bc2cd093bf5803edf512c099bfb220fd6459", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7d6a57411caf54df025860c9b1a82cd42d57a562", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d5603591373441fecf9951833d6d873e09320f08", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "288138418bef956f8b295751a4536c60f0e89f4a", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "9eda5478746ef7dc0e4e537b5a5e4b0ca1027091", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "807d6ee15804df6f01a35c910f09612e858739a6", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "309ae3e9a51a69699ca94eac5fac5688fa562d55", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "fdce0b3590f724540795b874b4c8850c90e6b0a8", "versionType": "git"}], "programFiles": ["net/ipv6/netfilter/ip6t_eui64.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.258", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.136", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.83", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.24", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.14", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv6/netfilter/ip6t_eui64.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/4d75bc2cd093bf5803edf512c099bfb220fd6459"}, {"url": "https://git.kernel.org/stable/c/7d6a57411caf54df025860c9b1a82cd42d57a562"}, {"url": "https://git.kernel.org/stable/c/d5603591373441fecf9951833d6d873e09320f08"}, {"url": "https://git.kernel.org/stable/c/288138418bef956f8b295751a4536c60f0e89f4a"}, {"url": "https://git.kernel.org/stable/c/9eda5478746ef7dc0e4e537b5a5e4b0ca1027091"}, {"url": "https://git.kernel.org/stable/c/807d6ee15804df6f01a35c910f09612e858739a6"}, {"url": "https://git.kernel.org/stable/c/309ae3e9a51a69699ca94eac5fac5688fa562d55"}, {"url": "https://git.kernel.org/stable/c/fdce0b3590f724540795b874b4c8850c90e6b0a8"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_eui64: reject invalid MAC header for all packets\n\n`eui64_mt6()` derives a modified EUI-64 from the Ethernet source address\nand compares it with the low 64 bits of the IPv6 source address.\n\nThe existing guard only rejects an invalid MAC header when\n`par->fragoff != 0`. For packets with `par->fragoff == 0`, `eui64_mt6()`\ncan still reach `eth_hdr(skb)` even when the MAC header is not valid.\n\nFix this by removing the `par->fragoff != 0` condition so that packets\nwith an invalid MAC header are rejected before accessing `eth_hdr(skb)`."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.258", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.209", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.175", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.136", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.83", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.24", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.14", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "2.6.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:24:29.973Z"}}}, "cveMetadata": {"cveId": "CVE-2026-31685", "state": "PUBLISHED", "dateUpdated": "2026-10-19T18:56:04.835Z", "dateReserved": "2026-03-09T15:48:24.131Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-04-25T08:47:02.857Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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For packets with `par->fragoff == 0`, `eui64_mt6()`\ncan still reach `eth_hdr(skb)` even when the MAC header is not valid.\n\nFix this by removing the `par->fragoff != 0` condition so that packets\nwith an invalid MAC header are rejected before accessing `eth_hdr(skb)`."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: ip6t_eui64: rechazar encabezado MAC inv\u00e1lido para todos los paquetes\n\n\u201ceui64_mt6()\u201d deriva un EUI-64 modificado de la direcci\u00f3n de origen Ethernet y lo compara con los 64 bits bajos de la direcci\u00f3n de origen IPv6.\n\nLa protecci\u00f3n existente solo rechaza un encabezado MAC inv\u00e1lido cuando \u201cpar -> fragoff != 0\u201d. Para paquetes con \u201cpar -> fragoff == 0\u201d, \u201ceui64_mt6()\u201d a\u00fan puede alcanzar \u201ceth_hdr(skb)\u201d incluso cuando el encabezado MAC no es v\u00e1lido.\n\nSoluciona esto eliminando la condici\u00f3n \u201cpar -> fragoff != 0\u201d para que los paquetes con un encabezado MAC inv\u00e1lido sean rechazados antes de acceder a \u201ceth_hdr(skb)\u201d."}], "id": "CVE-2026-31685", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.4, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.5, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31685", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:12:28.261772Z", "version": "2.0.3"}}]}, "published": "2026-04-25T09:16:02.273", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/288138418bef956f8b295751a4536c60f0e89f4a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/309ae3e9a51a69699ca94eac5fac5688fa562d55"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4d75bc2cd093bf5803edf512c099bfb220fd6459"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7d6a57411caf54df025860c9b1a82cd42d57a562"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/807d6ee15804df6f01a35c910f09612e858739a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9eda5478746ef7dc0e4e537b5a5e4b0ca1027091"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d5603591373441fecf9951833d6d873e09320f08"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fdce0b3590f724540795b874b4c8850c90e6b0a8"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.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-125"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets", "id": "2461759", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461759"}, "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"}, "cwe": "CWE-1287", "details": ["A flaw was found in the Linux kernel's netfilter component. This vulnerability occurs because the `eui64_mt6()` function, which processes IPv6 packets, does not properly validate the MAC header for all packets. Specifically, packets with a zero fragment offset could bypass an existing guard, allowing the system to attempt to access an invalid MAC header. A remote attacker could exploit this by sending specially crafted IPv6 packets, potentially causing a system crash and leading to a Denial of Service (DoS)."], "name": "CVE-2026-31685", "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": "Under investigation", "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": "2026-04-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31685\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31685\nhttps://lore.kernel.org/linux-cve-announce/2026042545-CVE-2026-31685-3fcc@gregkh/T"], "threat_severity": "Important"}

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