CVE-2021-47001

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This slows down rpcrdma_rep_create() enough to allow\nthe send side to post a bunch of RPC Calls before the Receive\ncompletion handler can invoke ib_post_recv()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable path is the NFS/RPC-over-RDMA client receive completion handler (rpcrdma_wc_receive \u2192 rpcrdma_reply_handler) processing network-delivered RDMA replies and credit grants from a remote peer. A malicious or compromised NFS/RDMA server reaches this code over RoCE/iWARP/IB fabrics without local code execution on the client.\nAC:L - A remote peer controls reconnect timing, the credit grant size that widens post_recvs work, and reply latency, so it can drive sends before receives are posted. This is an attacker-influenced race rather than a condition solely dependent on unrelated victim state.\nPR:N - The attacking NFS/RDMA peer needs no privileges on the victim client; triggering occurs via ordinary RDMA reply traffic on an already-established transport. Local CAP_SYS_ADMIN is only needed to create the mount, not for the peer to exploit the connected client.\nUI:N - In the highest-impact scenario the client already has an active NFS/RDMA mount to a compromised or malicious storage server, and exploitation proceeds during reconnect/reply handling without further victim action.\nS:U - Impact is limited to the victim host\u2019s NFS/RPC-over-RDMA transport availability and does not cross a VM, IOMMU, or other separate security authority.\nC:N - The bug only mis-orders cwnd update versus Receive posting, causing RNR and connection loss; there is no memory disclosure or corruption primitive.\nI:N - There is no attacker-controlled write, type confusion, or control-flow hijack; the failure mode is transport disconnect from RNR, not data or code integrity compromise.\nA:H - With rnr_retry_count set to 0, the race causes immediate RDMA connection loss after reconnect, denying NFS/RDMA service; a peer can repeat disconnect/reconnect to keep the mount unavailable."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sunrpc/xprtrdma/rpc_rdma.c", "net/sunrpc/xprtrdma/verbs.c", "net/sunrpc/xprtrdma/xprt_rdma.h"], "versions": [{"version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "eddae8be7944096419c2ae29477a45f767d0fcd4", "status": "affected", "versionType": "git"}, {"version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "8834ecb5df22b7ff3c9b0deba7726579bb613f95", "status": "affected", "versionType": "git"}, {"version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "19b5fa9489b5706bc878c3a522a7f771079e2fa0", "status": "affected", "versionType": "git"}, {"version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "lessThan": "35d8b10a25884050bb3b0149b62c3818ec59f77c", "status": "affected", "versionType": "git"}, {"version": "3791c5982ba1eebf2900ee7ca7b9a89619c26d54", 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A malicious or compromised NFS/RDMA server reaches this code over RoCE/iWARP/IB fabrics without local code execution on the client.\nAC:L - A remote peer controls reconnect timing, the credit grant size that widens post_recvs work, and reply latency, so it can drive sends before receives are posted. This is an attacker-influenced race rather than a condition solely dependent on unrelated victim state.\nPR:N - The attacking NFS/RDMA peer needs no privileges on the victim client; triggering occurs via ordinary RDMA reply traffic on an already-established transport. 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sunrpc/xprtrdma/rpc_rdma.c", "net/sunrpc/xprtrdma/verbs.c", "net/sunrpc/xprtrdma/xprt_rdma.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "eddae8be7944096419c2ae29477a45f767d0fcd4", "status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "versionType": "git"}, {"lessThan": "8834ecb5df22b7ff3c9b0deba7726579bb613f95", "status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "versionType": "git"}, {"lessThan": "19b5fa9489b5706bc878c3a522a7f771079e2fa0", "status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "versionType": "git"}, {"lessThan": "35d8b10a25884050bb3b0149b62c3818ec59f77c", "status": "affected", "version": "2ae50ad68cd79224198b525f7bd645c9da98b6ff", "versionType": "git"}, {"status": "affected", "version": "3791c5982ba1eebf2900ee7ca7b9a89619c26d54", "versionType": "git"}, {"lessThan": "5.5", "status": "affected", "version": "5.4.13", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sunrpc/xprtrdma/rpc_rdma.c", "net/sunrpc/xprtrdma/verbs.c", "net/sunrpc/xprtrdma/xprt_rdma.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.5"}, {"lessThan": "5.5", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.38", "versionType": "semver"}, {"lessThanOrEqual": "5.11.*", "status": "unaffected", "version": "5.11.22", "versionType": "semver"}, {"lessThanOrEqual": "5.12.*", "status": "unaffected", "version": "5.12.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2BB4E5E8-4AAD-475A-A1B9-F287254C7D72", "versionEndExcluding": "5.10.38", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "83B53E9A-F426-4C03-9A5F-A931FF79827E", "versionEndExcluding": "5.11.22", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0274929A-B36C-4F4C-AB22-30A0DD6B995B", "versionEndExcluding": "5.12.5", "versionStartIncluding": "5.12", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxprtrdma: Fix cwnd update ordering\n\nAfter a reconnect, the reply handler is opening the cwnd (and thus\nenabling more RPC Calls to be sent) /before/ rpcrdma_post_recvs()\ncan post enough Receive WRs to receive their replies. This causes an\nRNR and the new connection is lost immediately.\n\nThe race is most clearly exposed when KASAN and disconnect injection\nare enabled. This slows down rpcrdma_rep_create() enough to allow\nthe send side to post a bunch of RPC Calls before the Receive\ncompletion handler can invoke ib_post_recv()."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: xprtrdma: corrige el orden de actualizaci\u00f3n de cwnd Despu\u00e9s de una reconexi\u00f3n, el controlador de respuesta abre cwnd (y as\u00ed permite que se env\u00eden m\u00e1s llamadas RPC) /antes/ rpcrdma_post_recvs() puede publicar suficiente recepci\u00f3n WR para recibir sus respuestas. Esto provoca un RNR y la nueva conexi\u00f3n se pierde inmediatamente. La ejecuci\u00f3n se expone m\u00e1s claramente cuando KASAN y la inyecci\u00f3n de desconexi\u00f3n est\u00e1n habilitados. Esto ralentiza rpcrdma_rep_create() lo suficiente como para permitir que el lado de env\u00edo publique un mont\u00f3n de llamadas RPC antes de que el controlador de finalizaci\u00f3n de recepci\u00f3n pueda invocar ib_post_recv()."}], "id": "CVE-2021-47001", "lastModified": "2026-08-04T10:16:40.920", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47001", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-03-05T16:58:29.225383Z", "version": "2.0.3"}}]}, "published": "2024-02-28T09:15:38.213", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/19b5fa9489b5706bc878c3a522a7f771079e2fa0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/35d8b10a25884050bb3b0149b62c3818ec59f77c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8834ecb5df22b7ff3c9b0deba7726579bb613f95"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eddae8be7944096419c2ae29477a45f767d0fcd4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/19b5fa9489b5706bc878c3a522a7f771079e2fa0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/35d8b10a25884050bb3b0149b62c3818ec59f77c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8834ecb5df22b7ff3c9b0deba7726579bb613f95"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eddae8be7944096419c2ae29477a45f767d0fcd4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://security.netapp.com/advisory/ntap-20250411-0001/"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: xprtrdma: Fix cwnd update ordering", "id": "2266869", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2266869"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nxprtrdma: Fix cwnd update ordering\nAfter a reconnect, the reply handler is opening the cwnd (and thus\nenabling more RPC Calls to be sent) /before/ rpcrdma_post_recvs()\ncan post enough Receive WRs to receive their replies. This causes an\nRNR and the new connection is lost immediately.\nThe race is most clearly exposed when KASAN and disconnect injection\nare enabled. This slows down rpcrdma_rep_create() enough to allow\nthe send side to post a bunch of RPC Calls before the Receive\ncompletion handler can invoke ib_post_recv()."], "name": "CVE-2021-47001", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "2024-02-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47001\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47001\nhttps://lore.kernel.org/linux-cve-announce/2024022828-CVE-2021-47001-0e51@gregkh/T/#u"], "threat_severity": "Low"}

{}