205 lines
11 KiB
JSON
205 lines
11 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2026-31719",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2026-03-09T15:48:24.134Z",
|
|
"datePublished": "2026-05-01T13:56:13.385Z",
|
|
"dateUpdated": "2026-10-19T19:06:07.136Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-08-05T12:24:50.735Z"
|
|
},
|
|
"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."
|
|
}
|
|
],
|
|
"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"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |