167 lines
8.6 KiB
JSON
167 lines
8.6 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64208",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T15:36:31.769Z",
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"datePublished": "2026-07-24T15:23:00.113Z",
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"dateUpdated": "2026-08-05T12:40:02.002Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:40:02.002Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks\n\nChange the krb5 crypto library to provide facilities to precheck the length\nof the message about to be decrypted or verified.\n\nFix AF_RXRPC to make use of this to validate DATA packets secured with\nRxGK."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - Attacker-controlled RxRPC DATA packets reach the vulnerable RxGK verifier over UDP. A malicious contacted server can exercise the client receive path without network proximity.\nAC:L - A single deliberately short packet triggers the faulty length handling without a race or uncontrollable condition. Visible RxRPC header fields allow the peer to target an active call reliably.\nPR:N - The length handling occurs before MIC verification or decryption authenticates the packet. A malicious RxRPC server therefore needs no valid Kerberos key or credentials.\nUI:N - No human action is required once an application or mounted AFS/YFS client communicates over the RxGK connection. Packet processing and call termination occur automatically.\nS:U - The vulnerable RxRPC processing and resulting impact remain within the host kernel's security authority. No VM, sandbox, or IOMMU boundary is crossed.\nC:N - The underlying Kerberos implementations reject blobs shorter than their cryptographic overhead before accessing packet data. No out-of-bounds read or information disclosure is supported by the affected path.\nI:N - The malformed length does not produce an out-of-bounds write or attacker-controlled modification. Existing post-decryption checks prevent reading or applying a truncated inner header.\nA:H - A short unauthenticated packet aborts the active RxRPC call, and repeated injections can continuously deny RxGK-protected AFS/YFS operations. This can make a critical network filesystem or dependent service unavailable."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"Documentation/crypto/krb5.rst",
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"crypto/krb5/krb5_api.c",
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"include/crypto/krb5.h",
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"include/trace/events/rxrpc.h",
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"net/rxrpc/rxgk.c"
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],
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"versions": [
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{
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"version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a",
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"lessThan": "585f9f6aef5c4542ac9d6ec45cd7dbc7df9af3ff",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a",
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"lessThan": "9217017f4bce53dddb8d547837f1f707045d64ad",
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"status": "affected",
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{
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"lessThan": "2b50aceafe6606ea52ed42aadd1b4d44a188aade",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"Documentation/crypto/krb5.rst",
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"crypto/krb5/krb5_api.c",
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"include/crypto/krb5.h",
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"include/trace/events/rxrpc.h",
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"net/rxrpc/rxgk.c"
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],
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"versions": [
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{
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"version": "6.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.16",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.34",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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"operator": "OR",
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "6.18.34"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/585f9f6aef5c4542ac9d6ec45cd7dbc7df9af3ff"
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},
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{
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"url": "https://git.kernel.org/stable/c/9217017f4bce53dddb8d547837f1f707045d64ad"
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},
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{
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"url": "https://git.kernel.org/stable/c/2b50aceafe6606ea52ed42aadd1b4d44a188aade"
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}
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],
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"title": "crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks",
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