CVE-2026-31719

{"id": "CVE-2026-31719", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31719", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:12:50.260721Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "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": "d1775a177f7f38156d541c8a3e3c91eaa6e69699", "lessThan": "07cbb1bd424370671814a862913c99a6e1441588", "versionType": "git"}, {"status": "affected", "version": "d1775a177f7f38156d541c8a3e3c91eaa6e69699", "lessThan": "e51f42114abbdf47f29dda43e7826be28907fcd2", "versionType": "git"}, {"status": "affected", "version": "d1775a177f7f38156d541c8a3e3c91eaa6e69699", "lessThan": "3bfbf5f0a99c991769ec562721285df7ab69240b", "versionType": "git"}], "programFiles": ["crypto/krb5enc.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"status": "unaffected", "version": "0", "lessThan": "6.15", "versionType": "semver"}, {"status": "unaffected", "version": "6.18.25", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.2", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["crypto/krb5enc.c"], "defaultStatus": "affected"}]}], "published": "2026-05-01T14:16:22.077", "references": [{"url": "https://git.kernel.org/stable/c/07cbb1bd424370671814a862913c99a6e1441588", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3bfbf5f0a99c991769ec562721285df7ab69240b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e51f42114abbdf47f29dda43e7826be28907fcd2", "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-354"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: krb5enc - fix async decrypt skipping hash verification\n\nkrb5enc_dispatch_decrypt() sets req->base.complete as the skcipher\ncallback, which is the caller's own completion handler. When the\nskcipher completes asynchronously, this signals \"done\" to the caller\nwithout executing krb5enc_dispatch_decrypt_hash(), completely bypassing\nthe integrity verification (hash check).\n\nCompare with the encrypt path which correctly uses\nkrb5enc_encrypt_done as an intermediate callback to chain into the\nhash computation on async completion.\n\nFix by adding krb5enc_decrypt_done as an intermediate callback that\nchains into krb5enc_dispatch_decrypt_hash() upon async skcipher\ncompletion, matching the encrypt path's callback pattern.\n\nAlso fix EBUSY/EINPROGRESS handling throughout: remove\nkrb5enc_request_complete() which incorrectly swallowed EINPROGRESS\nnotifications that must be passed up to callers waiting on backlogged\nrequests, and add missing EBUSY checks in krb5enc_encrypt_ahash_done\nfor the dispatch_encrypt return value.\n\n\nUnset MAY_BACKLOG on the async completion path so the user won't\nsee back-to-back EINPROGRESS notifications."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncripto: krb5enc - corrige el descifrado as\u00edncrono que omite la verificaci\u00f3n de hash\n\nkrb5enc_dispatch_decrypt() establece req -> base.complete como la devoluci\u00f3n de llamada de skcipher, que es el propio gestor de finalizaci\u00f3n del llamador. Cuando el skcipher finaliza as\u00edncronamente, esto se\u00f1ala \u2019hecho\u2019 al llamador sin ejecutar krb5enc_dispatch_decrypt_hash(), omitiendo completamente la verificaci\u00f3n de integridad (comprobaci\u00f3n de hash).\n\nComparar con la ruta de cifrado que utiliza correctamente krb5enc_encrypt_done como una devoluci\u00f3n de llamada intermedia para encadenar en el c\u00e1lculo de hash en la finalizaci\u00f3n as\u00edncrona.\n\nSoluci\u00f3n a\u00f1adiendo krb5enc_decrypt_done como una devoluci\u00f3n de llamada intermedia que encadena en krb5enc_dispatch_decrypt_hash() tras la finalizaci\u00f3n as\u00edncrona de skcipher, coincidiendo con el patr\u00f3n de devoluci\u00f3n de llamada de la ruta de cifrado.\n\nTambi\u00e9n corrige el manejo de EBUSY/EINPROGRESS en todo el c\u00f3digo: elimina krb5enc_request_complete() que incorrectamente \u2019tragaba\u2019 las notificaciones de EINPROGRESS que deben pasarse a los llamadores que esperan solicitudes en cola, y a\u00f1ade comprobaciones de EBUSY faltantes en krb5enc_encrypt_ahash_done para el valor de retorno de dispatch_encrypt.\n\nDesestablece MAY_BACKLOG en la ruta de finalizaci\u00f3n as\u00edncrona para que el usuario no vea notificaciones de EINPROGRESS consecutivas."}], "lastModified": "2026-11-11T21:10:00.200", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F2D3B79E-3EFA-4203-9F11-FF77FD2FBA79", "versionEndExcluding": "6.18.25", "versionStartIncluding": "6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1BD58F1E-7C20-4C0D-92A2-FAC5CBFBE8A8", "versionEndExcluding": "7.0.2", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}