CVE-2026-31680

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31680", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.130Z", "datePublished": "2026-04-25T08:46:56.807Z", "dateUpdated": "2026-11-10T12:45:28.460Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:24:26.787Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv6: flowlabel: defer exclusive option free until RCU teardown\n\n`ip6fl_seq_show()` walks the global flowlabel hash under the seq-file\nRCU read-side lock and prints `fl->opt->opt_nflen` when an option block\nis present.\n\nExclusive flowlabels currently free `fl->opt` as soon as `fl->users`\ndrops to zero in `fl_release()`. However, the surrounding\n`struct ip6_flowlabel` remains visible in the global hash table until\nlater garbage collection removes it and `fl_free_rcu()` finally tears it\ndown.\n\nA concurrent `/proc/net/ip6_flowlabel` reader can therefore race that\nearly `kfree()` and dereference freed option state, triggering a crash\nin `ip6fl_seq_show()`.\n\nFix this by keeping `fl->opt` alive until `fl_free_rcu()`. That matches\nthe lifetime already required for the enclosing flowlabel while readers\ncan still reach it under RCU."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path is local: an attacker creates/releases IPv6 flowlabels through setsockopt(IPV6_FLOWLABEL_MGR) while reading /proc/net/ip6_flowlabel. Remote IPv6 packets do not reach this flowlabel option lifetime bug.\nAC:L - The race is between two attacker-controlled operations: flowlabel release and procfs seq-file reading. The attacker can run both sides concurrently and repeat the race without relying on external conditions.\nPR:L - Supplying the needed IPv6 option state commonly requires CAP_NET_RAW, but the check is against the socket network namespace user_ns and is reachable with low privileges via user namespaces. No real init-namespace root/admin privilege is required in the highest reasonable deployment scenario.\nUI:N - The attacker can create the socket state, release it, and read /proc/net/ip6_flowlabel directly. No victim action is required.\nS:U - This is a kernel memory lifetime bug within the same host kernel security authority. It does not cross a VM, IOMMU, or separate authorization boundary.\nC:H - The bug is a use-after-free of struct ipv6_txoptions reachable from procfs output, and freed kernel heap contents can be exposed or attacker-shaped. Per the required conservative guidance, kernel UAFs are scored High for confidentiality.\nI:H - Although the observed dereference is a stale read, this is a kernel heap use-after-free in attacker-reclaimable memory. Per the required conservative guidance and upward scoring on uncertainty, UAFs are scored High for integrity.\nA:H - A concurrent /proc/net/ip6_flowlabel reader can dereference freed option state in ip6fl_seq_show(), causing an oops or kernel crash. Kernel crashes are 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/ipv6/ip6_flowlabel.c"], "versions": [{"version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "4b6798024f7b2d535f3db1002c760143cdbd1bd3", "status": "affected", "versionType": "git"}, {"version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "3c54b66c83fb8fcbde8e6a7bf90b65856e39f827", "status": "affected", "versionType": "git"}, {"version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "5a6b15f861b7c1304949e3350d23490a5fe429fd", "status": "affected", "versionType": "git"}, {"version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "6c7fbdb8ffde6413640de7cfbd7c976c353e89f8", "status": "affected", "versionType": "git"}, {"version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "8027964931785cb73d520ac70a342a3dc16c249b", "status": "affected", "versionType": "git"}, {"version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "414726b69921fe6355ae453f5b35e68dd078342a", "status": "affected", "versionType": "git"}, {"version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "572ce62778519a7d4d1c15f55dd2e45a474133c4", "status": "affected", "versionType": "git"}, {"version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "9ca562bb8e66978b53028fa32b1a190708e6a091", "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/ipv6/ip6_flowlabel.c"], "versions": [{"version": "3.9", "status": "affected"}, {"version": "0", "lessThan": "3.9", "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": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "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": "3.9", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4b6798024f7b2d535f3db1002c760143cdbd1bd3"}, {"url": "https://git.kernel.org/stable/c/3c54b66c83fb8fcbde8e6a7bf90b65856e39f827"}, {"url": "https://git.kernel.org/stable/c/5a6b15f861b7c1304949e3350d23490a5fe429fd"}, {"url": "https://git.kernel.org/stable/c/6c7fbdb8ffde6413640de7cfbd7c976c353e89f8"}, {"url": "https://git.kernel.org/stable/c/8027964931785cb73d520ac70a342a3dc16c249b"}, {"url": "https://git.kernel.org/stable/c/414726b69921fe6355ae453f5b35e68dd078342a"}, {"url": "https://git.kernel.org/stable/c/572ce62778519a7d4d1c15f55dd2e45a474133c4"}, {"url": "https://git.kernel.org/stable/c/9ca562bb8e66978b53028fa32b1a190708e6a091"}], "title": "net: ipv6: flowlabel: defer exclusive option free until RCU teardown", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": 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Remote IPv6 packets do not reach this flowlabel option lifetime bug.\nAC:L - The race is between two attacker-controlled operations: flowlabel release and procfs seq-file reading. The attacker can run both sides concurrently and repeat the race without relying on external conditions.\nPR:L - Supplying the needed IPv6 option state commonly requires CAP_NET_RAW, but the check is against the socket network namespace user_ns and is reachable with low privileges via user namespaces. No real init-namespace root/admin privilege is required in the highest reasonable deployment scenario.\nUI:N - The attacker can create the socket state, release it, and read /proc/net/ip6_flowlabel directly. No victim action is required.\nS:U - This is a kernel memory lifetime bug within the same host kernel security authority. It does not cross a VM, IOMMU, or separate authorization boundary.\nC:H - The bug is a use-after-free of struct ipv6_txoptions reachable from procfs output, and freed kernel heap contents can be exposed or attacker-shaped. Per the required conservative guidance, kernel UAFs are scored High for confidentiality.\nI:H - Although the observed dereference is a stale read, this is a kernel heap use-after-free in attacker-reclaimable memory. Per the required conservative guidance and upward scoring on uncertainty, UAFs are scored High for integrity.\nA:H - A concurrent /proc/net/ip6_flowlabel reader can dereference freed option state in ip6fl_seq_show(), causing an oops or kernel crash. Kernel crashes are High availability impact."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "4b6798024f7b2d535f3db1002c760143cdbd1bd3", "versionType": "git"}, {"status": "affected", "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "3c54b66c83fb8fcbde8e6a7bf90b65856e39f827", "versionType": "git"}, {"status": "affected", "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "5a6b15f861b7c1304949e3350d23490a5fe429fd", "versionType": "git"}, {"status": "affected", "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "6c7fbdb8ffde6413640de7cfbd7c976c353e89f8", "versionType": "git"}, {"status": "affected", "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "8027964931785cb73d520ac70a342a3dc16c249b", "versionType": "git"}, {"status": "affected", "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "414726b69921fe6355ae453f5b35e68dd078342a", "versionType": "git"}, {"status": "affected", "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "572ce62778519a7d4d1c15f55dd2e45a474133c4", "versionType": "git"}, {"status": "affected", "version": "d3aedd5ebd4b0b925b0bcda548066803e1318499", "lessThan": "9ca562bb8e66978b53028fa32b1a190708e6a091", "versionType": "git"}], "programFiles": ["net/ipv6/ip6_flowlabel.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.9"}, {"status": "unaffected", "version": "0", "lessThan": "3.9", "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": "6.6.134", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.81", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.22", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.12", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv6/ip6_flowlabel.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/4b6798024f7b2d535f3db1002c760143cdbd1bd3"}, {"url": "https://git.kernel.org/stable/c/3c54b66c83fb8fcbde8e6a7bf90b65856e39f827"}, {"url": "https://git.kernel.org/stable/c/5a6b15f861b7c1304949e3350d23490a5fe429fd"}, {"url": "https://git.kernel.org/stable/c/6c7fbdb8ffde6413640de7cfbd7c976c353e89f8"}, {"url": "https://git.kernel.org/stable/c/8027964931785cb73d520ac70a342a3dc16c249b"}, {"url": "https://git.kernel.org/stable/c/414726b69921fe6355ae453f5b35e68dd078342a"}, {"url": "https://git.kernel.org/stable/c/572ce62778519a7d4d1c15f55dd2e45a474133c4"}, {"url": "https://git.kernel.org/stable/c/9ca562bb8e66978b53028fa32b1a190708e6a091"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv6: flowlabel: defer exclusive option free until RCU teardown\n\n`ip6fl_seq_show()` walks the global flowlabel hash under the seq-file\nRCU read-side lock and prints `fl->opt->opt_nflen` when an option block\nis present.\n\nExclusive flowlabels currently free `fl->opt` as soon as `fl->users`\ndrops to zero in `fl_release()`. However, the surrounding\n`struct ip6_flowlabel` remains visible in the global hash table until\nlater garbage collection removes it and `fl_free_rcu()` finally tears it\ndown.\n\nA concurrent `/proc/net/ip6_flowlabel` reader can therefore race that\nearly `kfree()` and dereference freed option state, triggering a crash\nin `ip6fl_seq_show()`.\n\nFix this by keeping `fl->opt` alive until `fl_free_rcu()`. That matches\nthe lifetime already required for the enclosing flowlabel while readers\ncan still reach it under RCU."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.253", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.203", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.168", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.134", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.81", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.22", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.12", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "3.9"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:24:26.787Z"}}}, "cveMetadata": {"cveId": "CVE-2026-31680", "state": "PUBLISHED", "dateUpdated": "2026-11-10T12:45:28.460Z", "dateReserved": "2026-03-09T15:48:24.130Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-04-25T08:46:56.807Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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`fl_release()`. However, the surrounding\n`struct ip6_flowlabel` remains visible in the global hash table until\nlater garbage collection removes it and `fl_free_rcu()` finally tears it\ndown.\n\nA concurrent `/proc/net/ip6_flowlabel` reader can therefore race that\nearly `kfree()` and dereference freed option state, triggering a crash\nin `ip6fl_seq_show()`.\n\nFix this by keeping `fl->opt` alive until `fl_free_rcu()`. That matches\nthe lifetime already required for the enclosing flowlabel while readers\ncan still reach it under RCU."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: ipv6: flowlabel: aplazar la liberaci\u00f3n de la opci\u00f3n exclusiva hasta el desmontaje de RCU\n\n\u2019ip6fl_seq_show()\u2019 recorre el hash global de flowlabel bajo el bloqueo de lectura de RCU del archivo seq e imprime \u2019fl -> opt -> opt_nflen\u2019 cuando un bloque de opci\u00f3n est\u00e1 presente.\n\nLos flowlabels exclusivos actualmente liberan \u2019fl -> opt\u2019 tan pronto como \u2019fl -> users\u2019 cae a cero en \u2019fl_release()\u2019. Sin embargo, la \u2019struct ip6_flowlabel\u2019 circundante permanece visible en la tabla hash global hasta que una recolecci\u00f3n de basura posterior la elimine y \u2019fl_free_rcu()\u2019 finalmente la desmonte.\n\nUn lector concurrente de \u2019/proc/ net/ip6_flowlabel\u2019 puede, por lo tanto, competir con esa \u2019kfree()\u2019 temprana y desreferenciar el estado de opci\u00f3n liberado, lo que provoca un fallo en \u2019ip6fl_seq_show()\u2019.\n\nSoluciona esto manteniendo \u2019fl -> opt\u2019 vivo hasta \u2019fl_free_rcu()\u2019. Eso coincide con la vida \u00fatil ya requerida para el flowlabel que lo contiene mientras los lectores a\u00fan pueden acceder a \u00e9l bajo RCU."}], "id": "CVE-2026-31680", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31680", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:12:23.036935Z", "version": "2.0.3"}}]}, "published": "2026-04-25T09:16:01.673", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3c54b66c83fb8fcbde8e6a7bf90b65856e39f827"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/414726b69921fe6355ae453f5b35e68dd078342a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4b6798024f7b2d535f3db1002c760143cdbd1bd3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/572ce62778519a7d4d1c15f55dd2e45a474133c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5a6b15f861b7c1304949e3350d23490a5fe429fd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6c7fbdb8ffde6413640de7cfbd7c976c353e89f8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8027964931785cb73d520ac70a342a3dc16c249b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9ca562bb8e66978b53028fa32b1a190708e6a091"}, {"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-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: net: ipv6: flowlabel: defer exclusive option free until RCU teardown", "id": "2461764", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461764"}, "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-825", "details": ["A flaw was found in the Linux kernel. A local user can exploit a race condition in the IPv6 flow label handling, specifically during the teardown of exclusive flow label options. This can lead to a use-after-free vulnerability when a concurrent reader accesses freed option state, triggering a system crash and a Denial of Service (DoS)."], "name": "CVE-2026-31680", "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": "2026-04-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31680\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31680\nhttps://lore.kernel.org/linux-cve-announce/2026042544-CVE-2026-31680-7624@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d3aedd5ebd4b0b925b0bcda548066803e1318499,4b6798024f7b2d535f3db1002c760143cdbd1bd3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d3aedd5ebd4b0b925b0bcda548066803e1318499,3c54b66c83fb8fcbde8e6a7bf90b65856e39f827)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d3aedd5ebd4b0b925b0bcda548066803e1318499,5a6b15f861b7c1304949e3350d23490a5fe429fd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d3aedd5ebd4b0b925b0bcda548066803e1318499,6c7fbdb8ffde6413640de7cfbd7c976c353e89f8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d3aedd5ebd4b0b925b0bcda548066803e1318499,8027964931785cb73d520ac70a342a3dc16c249b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d3aedd5ebd4b0b925b0bcda548066803e1318499,414726b69921fe6355ae453f5b35e68dd078342a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d3aedd5ebd4b0b925b0bcda548066803e1318499,572ce62778519a7d4d1c15f55dd2e45a474133c4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d3aedd5ebd4b0b925b0bcda548066803e1318499,9ca562bb8e66978b53028fa32b1a190708e6a091)"}}], "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": "generic", "value": "3.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.253,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.203,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.168,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.134,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.81,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.22,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.12,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "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"}], "created": "2026-04-27T19:15:11.610357+00:00", "updated": "2026-10-19T22:00:06.821113+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}