CVE-2026-31668

{"id": "CVE-2026-31668", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31668", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:11:58.632847Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6c8702c60b88651072460f3f4026c7dfe2521d12", "lessThan": "1dec91d3b1cefb82635761b7812154af3ef46449", "versionType": "git"}, {"status": "affected", "version": "6c8702c60b88651072460f3f4026c7dfe2521d12", "lessThan": "750569d6987a0ff46317a4b86eb3907e296287bf", "versionType": "git"}, {"status": "affected", "version": "6c8702c60b88651072460f3f4026c7dfe2521d12", "lessThan": "57d0374d14fa667dec6952173b93e7e84486d5c9", "versionType": "git"}, {"status": "affected", "version": "6c8702c60b88651072460f3f4026c7dfe2521d12", "lessThan": "84d458018b147176b259347103fccb7e93abd2b1", "versionType": "git"}, {"status": "affected", "version": "6c8702c60b88651072460f3f4026c7dfe2521d12", "lessThan": "6305ad032b03d2ea4181b953a66e19a9a6ed053c", "versionType": "git"}, {"status": "affected", "version": "6c8702c60b88651072460f3f4026c7dfe2521d12", "lessThan": "fb56de5d99218de49d5d43ef3a99e062ecd0f9a1", "versionType": "git"}, {"status": "affected", "version": "6c8702c60b88651072460f3f4026c7dfe2521d12", "lessThan": "17d87d42874f5d6c1a0ccc6d9190dfe82a9a7a6a", "versionType": "git"}, {"status": "affected", "version": "6c8702c60b88651072460f3f4026c7dfe2521d12", "lessThan": "c3812651b522fe8437ebb7063b75ddb95b571643", "versionType": "git"}], "programFiles": ["net/ipv6/seg6_iptunnel.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.10"}, {"status": "unaffected", "version": "0", "lessThan": "4.10", "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": "6.1.169", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.135", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.82", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.23", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.13", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv6/seg6_iptunnel.c"], "defaultStatus": "affected"}]}], "published": "2026-04-24T15:16:46.533", "references": [{"url": "https://git.kernel.org/stable/c/17d87d42874f5d6c1a0ccc6d9190dfe82a9a7a6a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1dec91d3b1cefb82635761b7812154af3ef46449", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/57d0374d14fa667dec6952173b93e7e84486d5c9", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6305ad032b03d2ea4181b953a66e19a9a6ed053c", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/750569d6987a0ff46317a4b86eb3907e296287bf", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/84d458018b147176b259347103fccb7e93abd2b1", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c3812651b522fe8437ebb7063b75ddb95b571643", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fb56de5d99218de49d5d43ef3a99e062ecd0f9a1", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-459"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nseg6: separate dst_cache for input and output paths in seg6 lwtunnel\n\nThe seg6 lwtunnel uses a single dst_cache per encap route, shared\nbetween seg6_input_core() and seg6_output_core(). These two paths\ncan perform the post-encap SID lookup in different routing contexts\n(e.g., ip rules matching on the ingress interface, or VRF table\nseparation). Whichever path runs first populates the cache, and the\nother reuses it blindly, bypassing its own lookup.\n\nFix this by splitting the cache into cache_input and cache_output,\nso each path maintains its own cached dst independently."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nseg6: separar dst_cache para las rutas de entrada y salida en el lwtunnel seg6\n\nEl lwtunnel seg6 utiliza una \u00fanica dst_cache por ruta de encapsulaci\u00f3n, compartida entre seg6_input_core() y seg6_output_core(). Estas dos rutas pueden realizar la b\u00fasqueda de SID post-encapsulaci\u00f3n en diferentes contextos de enrutamiento (por ejemplo, reglas IP que coinciden en la interfaz de entrada, o separaci\u00f3n de tablas VRF). Cualquiera de las rutas que se ejecute primero rellena la cach\u00e9, y la otra la reutiliza ciegamente, omitiendo su propia b\u00fasqueda.\n\nEsto se soluciona dividiendo la cach\u00e9 en cache_input y cache_output, para que cada ruta mantenga su propia dst en cach\u00e9 de forma independiente."}], "lastModified": "2026-11-11T23:10:00.263", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C0D3F33A-9B37-46EB-A8C3-97B2F00C65EB", "versionEndExcluding": "5.10.253", "versionStartIncluding": "4.10.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "20DDB3E9-AABF-4107-ADB0-5362AA067045", "versionEndExcluding": "5.15.203", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DBEC0E5D-641C-4E98-A6D9-5799B10CE451", "versionEndExcluding": "6.1.169", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "15C1A1B2-14EE-494C-AF3E-D5A7BA640B39", "versionEndExcluding": "6.6.135", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "02904CAE-71D2-45B3-9EC3-F6A9D18B6307", "versionEndExcluding": "6.12.82", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E9E09FDD-9EE3-4A56-92E2-2B30AFD0072F", "versionEndExcluding": "6.18.23", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1490EF9B-9080-481C-8D22-1306AAE664E4", "versionEndExcluding": "6.19.13", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:4.10:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C201E405-86F2-4F96-984A-00A865219C86"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}