CVE-2026-64208

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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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["Documentation/crypto/krb5.rst", "crypto/krb5/krb5_api.c", "include/crypto/krb5.h", "include/trace/events/rxrpc.h", "net/rxrpc/rxgk.c"], "versions": [{"version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a", "lessThan": "585f9f6aef5c4542ac9d6ec45cd7dbc7df9af3ff", "status": "affected", "versionType": "git"}, {"version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a", "lessThan": "9217017f4bce53dddb8d547837f1f707045d64ad", "status": "affected", "versionType": "git"}, {"version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a", "lessThan": "2b50aceafe6606ea52ed42aadd1b4d44a188aade", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["Documentation/crypto/krb5.rst", "crypto/krb5/krb5_api.c", "include/crypto/krb5.h", "include/trace/events/rxrpc.h", "net/rxrpc/rxgk.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "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": "6.16", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/585f9f6aef5c4542ac9d6ec45cd7dbc7df9af3ff"}, {"url": "https://git.kernel.org/stable/c/9217017f4bce53dddb8d547837f1f707045d64ad"}, {"url": "https://git.kernel.org/stable/c/2b50aceafe6606ea52ed42aadd1b4d44a188aade"}], "title": "crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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{"bugzilla": {"description": "kernel: crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks", "id": "2506827", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506827"}, "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-120", "details": ["A flaw was found in the Linux kernel's `krb5` crypto library and `AF_RXRPC` component. This vulnerability arises from a lack of proper length checks before decrypting or verifying incoming messages. A remote attacker could exploit this by sending specially crafted messages, leading to a Denial of Service (DoS) condition where the system becomes unavailable."], "name": "CVE-2026-64208", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64208\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64208\nhttps://lore.kernel.org/linux-cve-announce/2026072411-CVE-2026-64208-5d8d@gregkh/T"], "threat_severity": "Moderate"}

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