{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31679", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.130Z", "datePublished": "2026-04-25T08:46:55.584Z", "dateUpdated": "2026-10-16T15:20:23.730Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:24:25.701Z" }, "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." } ], "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": "4cae986225f8b8679ad86b924918e7d75a96aa61", "status": "affected", "versionType": "git" }, { "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "8ed7b9930cbc3bc71f868fa79a68700ac88d586a", "status": "affected", "versionType": "git" }, { "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "c1f97152df8dfb17e855ddf0fc409b7bd13e9700", "status": "affected", "versionType": "git" }, { "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "98de18d327ef8cbbb704980e359e4872d8c28997", "status": "affected", "versionType": "git" }, { "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "bd50c7484c3bb34097571c1334174fb8b7408036", "status": "affected", "versionType": "git" }, { "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "2ca33b88a79ca42f017ae0f7011280325655438e", "status": "affected", "versionType": "git" }, { "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3", "lessThan": "546b68ac893595877ffbd7751e5c55fd1c43ede6", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/openvswitch/flow_netlink.c" ], "versions": [ { "version": "5.5", "status": "affected" }, { "version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.11", "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": "5.5", "versionEndExcluding": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.1.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.6.131" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.12.80" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.18.21" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.19.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "7.0" } ] } ] } ], "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" } ], "title": "openvswitch: validate MPLS set/set_masked payload length", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-31679", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:12:20.188389Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:20:23.730Z" } } ] } }