CVE-2026-31719

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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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable AEAD decrypt path is used by Kerberos crypto for network-facing consumers such as RxRPC/AFS and Ceph. A remote peer or network attacker can supply or tamper with encrypted protocol packets that reach `crypto_krb5_decrypt()` and then `krb5enc_decrypt()`.\nAC:L - There is no attacker-uncontrolled race; on a vulnerable deployment using an asynchronous skcipher provider, the bypass follows directly from an async decrypt completion. When uncertain about async-provider deployment details, the higher-severity Low complexity is selected.\nPR:N - The attack can be carried in network traffic toward a kernel network filesystem/protocol endpoint and does not require local privileges on the target. In the strongest plausible scenario, a network attacker tampering with an existing protected flow needs no target-system account.\nUI:N - No victim user action is required once the affected service or client connection is active. Packet processing reaches the vulnerable decrypt path automatically.\nS:U - The impact remains within the kernel/protocol security authority handling the protected traffic. This is not a VM escape, sandbox escape, or cross-authority boundary violation.\nC:N - The bug skips integrity verification after decryption but does not by itself disclose plaintext or kernel memory. I found no memory corruption or read primitive associated with the fix.\nI:H - An async decrypt can complete successfully without checking the Kerberos checksum, allowing tampered ciphertext to be accepted as authenticated plaintext. For network storage/filesystem protocols, that can permit forgery or unauthorized modification of protected protocol data.\nA:N - The fixed flaw is an authentication/integrity bypass, and the investigation did not identify a new kernel crash, hang, or resource exhaustion primitive. Bad packets may be rejected or abort protocol state, but that is not a distinct high-availability impact from this bug."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["crypto/krb5enc.c"], "versions": [{"version": "d1775a177f7f38156d541c8a3e3c91eaa6e69699", "lessThan": "07cbb1bd424370671814a862913c99a6e1441588", "status": "affected", "versionType": "git"}, {"version": "d1775a177f7f38156d541c8a3e3c91eaa6e69699", "lessThan": "e51f42114abbdf47f29dda43e7826be28907fcd2", "status": "affected", "versionType": "git"}, {"version": "d1775a177f7f38156d541c8a3e3c91eaa6e69699", "lessThan": "3bfbf5f0a99c991769ec562721285df7ab69240b", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["crypto/krb5enc.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.25", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.2", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.15", "versionEndExcluding": "6.18.25"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.0.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/07cbb1bd424370671814a862913c99a6e1441588"}, {"url": "https://git.kernel.org/stable/c/e51f42114abbdf47f29dda43e7826be28907fcd2"}, {"url": "https://git.kernel.org/stable/c/3bfbf5f0a99c991769ec562721285df7ab69240b"}], "title": "crypto: krb5enc - fix async decrypt skipping hash verification", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-31719", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:12:50.260721Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-354", "description": "CWE-354 Improper Validation of Integrity Check Value"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:06:07.136Z"}}]}}

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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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.25", "versionStartIncluding": "6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.2", "versionStartIncluding": "6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "6.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:24:50.735Z"}}}, "cveMetadata": {"cveId": "CVE-2026-31719", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:06:07.136Z", "dateReserved": "2026-03-09T15:48:24.134Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-01T13:56:13.385Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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."}], "id": "CVE-2026-31719", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31719", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:12:50.260721Z", "version": "2.0.3"}}]}, "published": "2026-05-01T14:16:22.077", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/07cbb1bd424370671814a862913c99a6e1441588"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3bfbf5f0a99c991769ec562721285df7ab69240b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e51f42114abbdf47f29dda43e7826be28907fcd2"}], "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-354"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: crypto: krb5enc - fix async decrypt skipping hash verification", "id": "2464361", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464361"}, "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-325", "details": ["A flaw was found in the `krb5enc` module of the Linux kernel's crypto subsystem. When performing asynchronous decryption, the `krb5enc_dispatch_decrypt()` function incorrectly bypasses the integrity verification (hash check). This issue occurs because the `skcipher` completion handler signals completion without executing the necessary hash verification, potentially allowing an attacker to manipulate data without detection."], "name": "CVE-2026-31719", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not 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": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31719\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31719\nhttps://lore.kernel.org/linux-cve-announce/2026050125-CVE-2026-31719-3da7@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d1775a177f7f38156d541c8a3e3c91eaa6e69699,07cbb1bd424370671814a862913c99a6e1441588)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d1775a177f7f38156d541c8a3e3c91eaa6e69699,e51f42114abbdf47f29dda43e7826be28907fcd2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d1775a177f7f38156d541c8a3e3c91eaa6e69699,3bfbf5f0a99c991769ec562721285df7ab69240b)"}}], "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": "semver", "value": "6.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.25,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.2,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1-rc1,*]"}}], "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": "2026-05-01T23:30:06.019504+00:00", "updated": "2026-10-23T08:45:16.396708+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}