CVE-2026-31568

{"id": "CVE-2026-31568", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31568", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-05T21:39:07.590565Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 1.8}]}, "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": "084ea4d611a3d00ee3930400b262240e10895900", "lessThan": "48eda93e50f8361dee8e261fe55d0b31714e1e56", "versionType": "git"}, {"status": "affected", "version": "084ea4d611a3d00ee3930400b262240e10895900", "lessThan": "1eb35c54cd81cf874ce7d69e3dbfb162f211b8bd", "versionType": "git"}, {"status": "affected", "version": "084ea4d611a3d00ee3930400b262240e10895900", "lessThan": "b36b0e804aee5f20c6798dbeaeaa7cfdb7c6cf88", "versionType": "git"}, {"status": "affected", "version": "084ea4d611a3d00ee3930400b262240e10895900", "lessThan": "43ac2d18db1131df0a89993f709131ebfc29f3bd", "versionType": "git"}, {"status": "affected", "version": "084ea4d611a3d00ee3930400b262240e10895900", "lessThan": "b00be77302d7ec4ad0367bb236494fce7172b730", "versionType": "git"}], "programFiles": ["arch/s390/mm/fault.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.7"}, {"status": "unaffected", "version": "0", "lessThan": "5.7", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.191", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.160", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"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": ["arch/s390/mm/fault.c"], "defaultStatus": "affected"}]}], "published": "2026-04-24T15:16:31.313", "references": [{"url": "https://git.kernel.org/stable/c/1eb35c54cd81cf874ce7d69e3dbfb162f211b8bd", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/43ac2d18db1131df0a89993f709131ebfc29f3bd", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/48eda93e50f8361dee8e261fe55d0b31714e1e56", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b00be77302d7ec4ad0367bb236494fce7172b730", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b36b0e804aee5f20c6798dbeaeaa7cfdb7c6cf88", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-125"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/mm: Add missing secure storage access fixups for donated memory\n\nThere are special cases where secure storage access exceptions happen\nin a kernel context for pages that don't have the PG_arch_1 bit\nset. That bit is set for non-exported guest secure storage (memory)\nbut is absent on storage donated to the Ultravisor since the kernel\nisn't allowed to export donated pages.\n\nPrior to this patch we would try to export the page by calling\narch_make_folio_accessible() which would instantly return since the\narch bit is absent signifying that the page was already exported and\nno further action is necessary. This leads to secure storage access\nexception loops which can never be resolved.\n\nWith this patch we unconditionally try to export and if that fails we\nfixup."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ns390/mm: A\u00f1adir correcciones faltantes de acceso a almacenamiento seguro para memoria donada\n\nHay casos especiales donde ocurren excepciones de acceso a almacenamiento seguro en un contexto de kernel para p\u00e1ginas que no tienen el bit PG_arch_1 establecido. Ese bit est\u00e1 establecido para almacenamiento seguro de invitado no exportado (memoria) pero est\u00e1 ausente en el almacenamiento donado al Ultravisor ya que el kernel no tiene permitido exportar p\u00e1ginas donadas.\n\nAntes de este parche, intentar\u00edamos exportar la p\u00e1gina llamando a arch_make_folio_accessible() lo que regresar\u00eda instant\u00e1neamente ya que el bit arch est\u00e1 ausente, significando que la p\u00e1gina ya hab\u00eda sido exportada y no es necesaria ninguna acci\u00f3n adicional. Esto lleva a bucles de excepci\u00f3n de acceso a almacenamiento seguro que nunca pueden ser resueltos.\n\nCon este parche, intentamos exportar incondicionalmente y si eso falla, corregimos."}], "lastModified": "2026-11-11T23:10:00.263", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E034C3DB-8767-405F-B61D-0462FF99F64E", "versionEndExcluding": "6.18.21", "versionStartIncluding": "5.7.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4CA2E747-A9EC-4518-9AA2-B4247FC748B7", "versionEndExcluding": "6.19.11", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.7:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3D23CE42-BDB2-4216-8495-230ABE98FCDD"}, {"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"}