CVE-2026-31679

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In action handling, OVS expects fixed-size\nMPLS key data (struct ovs_key_mpls).\n\nUse the already normalized key_len (masked case included) and reject\nnon-matching MPLS action key sizes.\n\nReject invalid MPLS action payload lengths early."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path is reached through Open vSwitch generic netlink commands that install or execute datapath actions, not by unauthenticated remote packets alone.\nAC:L - An attacker can craft the malformed MPLS SET/SET_MASKED netlink attributes and an MPLS packet directly; there is no race or victim-controlled timing requirement.\nPR:L - The relevant OVS commands require CAP_NET_ADMIN, but the families are netns-aware and use GENL_UNS_ADMIN_PERM, making them reachable with CAP_NET_ADMIN in a user-created network namespace.\nUI:N - No victim interaction is required once the attacker can send the crafted netlink request or trigger the installed action.\nS:U - The impact remains within the kernel/host networking security authority and does not cross a VM, IOMMU, or similar scope boundary.\nC:H - The invalid MPLS payload length can make action execution read beyond the validated netlink action data from kernel heap storage. Although each read is small, repeated attacker-controlled triggering and heap layout influence make high confidentiality impact the safer defensible choice.\nI:N - The bug causes out-of-bounds reads and attacker-influenced packet MPLS rewriting, but it does not provide a kernel memory write primitive or control-flow modification.\nA:H - The out-of-bounds kernel heap read can trigger a kernel fault or sanitizer-detected panic, and the crafted action can be exercised repeatedly without user interaction."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/openvswitch/flow_netlink.c"], "versions": [{"version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "68f32ef0683c8d1c05cd2e4f16818fa63ff59c6f", "status": "affected", "versionType": "git"}, {"version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": 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Although each read is small, repeated attacker-controlled triggering and heap layout influence make high confidentiality impact the safer defensible choice.\nI:N - The bug causes out-of-bounds reads and attacker-influenced packet MPLS rewriting, but it does not provide a kernel memory write primitive or control-flow modification.\nA:H - The out-of-bounds kernel heap read can trigger a kernel fault or sanitizer-detected panic, and the crafted action can be exercised repeatedly without user interaction."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "68f32ef0683c8d1c05cd2e4f16818fa63ff59c6f", "versionType": "git"}, {"status": "affected", "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "4cae986225f8b8679ad86b924918e7d75a96aa61", "versionType": "git"}, {"status": "affected", "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "8ed7b9930cbc3bc71f868fa79a68700ac88d586a", "versionType": "git"}, {"status": "affected", "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "c1f97152df8dfb17e855ddf0fc409b7bd13e9700", "versionType": "git"}, {"status": "affected", "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "98de18d327ef8cbbb704980e359e4872d8c28997", "versionType": "git"}, {"status": "affected", "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "bd50c7484c3bb34097571c1334174fb8b7408036", "versionType": "git"}, {"status": "affected", "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "2ca33b88a79ca42f017ae0f7011280325655438e", "versionType": "git"}, {"status": "affected", "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "546b68ac893595877ffbd7751e5c55fd1c43ede6", "versionType": "git"}], "programFiles": ["net/openvswitch/flow_netlink.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.5"}, {"status": "unaffected", "version": "0", "lessThan": "5.5", "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": "6.6.131", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.80", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.21", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.11", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/openvswitch/flow_netlink.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/68f32ef0683c8d1c05cd2e4f16818fa63ff59c6f"}, {"url": "https://git.kernel.org/stable/c/4cae986225f8b8679ad86b924918e7d75a96aa61"}, {"url": "https://git.kernel.org/stable/c/8ed7b9930cbc3bc71f868fa79a68700ac88d586a"}, {"url": "https://git.kernel.org/stable/c/c1f97152df8dfb17e855ddf0fc409b7bd13e9700"}, {"url": "https://git.kernel.org/stable/c/98de18d327ef8cbbb704980e359e4872d8c28997"}, {"url": "https://git.kernel.org/stable/c/bd50c7484c3bb34097571c1334174fb8b7408036"}, {"url": "https://git.kernel.org/stable/c/2ca33b88a79ca42f017ae0f7011280325655438e"}, {"url": "https://git.kernel.org/stable/c/546b68ac893595877ffbd7751e5c55fd1c43ede6"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: validate MPLS set/set_masked payload length\n\nvalidate_set() accepted OVS_KEY_ATTR_MPLS as variable-sized payload for\nSET/SET_MASKED actions. In action handling, OVS expects fixed-size\nMPLS key data (struct ovs_key_mpls).\n\nUse the already normalized key_len (masked case included) and reject\nnon-matching MPLS action key sizes.\n\nReject invalid MPLS action payload lengths early."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.253", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.203", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.168", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.131", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.80", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.21", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.11", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "5.5"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:24:25.701Z"}}}, "cveMetadata": {"cveId": "CVE-2026-31679", "state": "PUBLISHED", "dateUpdated": "2026-10-19T18:56:04.364Z", "dateReserved": "2026-03-09T15:48:24.130Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-04-25T08:46:55.584Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: validate MPLS set/set_masked payload length\n\nvalidate_set() accepted OVS_KEY_ATTR_MPLS as variable-sized payload for\nSET/SET_MASKED actions. In action handling, OVS expects fixed-size\nMPLS key data (struct ovs_key_mpls).\n\nUse the already normalized key_len (masked case included) and reject\nnon-matching MPLS action key sizes.\n\nReject invalid MPLS action payload lengths early."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nopenvswitch: validar la longitud de la carga \u00fatil MPLS set/set_masked\n\nvalidate_set() aceptaba OVS_KEY_ATTR_MPLS como carga \u00fatil de tama\u00f1o variable para las acciones SET/SET_MASKED. En el manejo de acciones, OVS espera datos de clave MPLS de tama\u00f1o fijo (estructura ovs_key_mpls).\n\nUsar la key_len ya normalizada (caso enmascarado incluido) y rechazar los tama\u00f1os de clave de acci\u00f3n MPLS que no coincidan.\n\nRechazar las longitudes de carga \u00fatil de acci\u00f3n MPLS no v\u00e1lidas temprano."}], "id": "CVE-2026-31679", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31679", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:12:20.188389Z", "version": "2.0.3"}}]}, "published": "2026-04-25T09:16:01.550", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2ca33b88a79ca42f017ae0f7011280325655438e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4cae986225f8b8679ad86b924918e7d75a96aa61"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/546b68ac893595877ffbd7751e5c55fd1c43ede6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/68f32ef0683c8d1c05cd2e4f16818fa63ff59c6f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8ed7b9930cbc3bc71f868fa79a68700ac88d586a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/98de18d327ef8cbbb704980e359e4872d8c28997"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bd50c7484c3bb34097571c1334174fb8b7408036"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c1f97152df8dfb17e855ddf0fc409b7bd13e9700"}], "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-20"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: openvswitch: validate MPLS set/set_masked payload length", "id": "2461762", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461762"}, "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-1284", "details": ["A flaw was found in the Linux kernel's openvswitch component. This vulnerability arises from improper validation of Multiprotocol Label Switching (MPLS) payload lengths during SET/SET_MASKED actions. An attacker could potentially exploit this by providing malformed MPLS key data, leading to unexpected behavior or a denial of service (DoS) condition within the kernel."], "name": "CVE-2026-31679", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not 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-2026-31679\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31679\nhttps://lore.kernel.org/linux-cve-announce/2026042544-CVE-2026-31679-7f32@gregkh/T"], "threat_severity": "Moderate"}

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