CVE-2023-53680

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It assumes callers are\ncareful to avoid calling it with an out-of-bounds opnum value.\n\nnfsd4_decode_compound() is not so careful, and can invoke OPDESC()\nwith opnum set to OP_ILLEGAL, which is 10044 -- well beyond the end\nof nfsd4_ops[]."}], "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 defect is in nfsd's NFSv4 COMPOUND XDR decoder, driven directly by bytes a remote client sends to TCP/2049. Any host able to reach the NFS server can supply the malformed opnum.\nAC:L - Triggering requires only a single COMPOUND request carrying an opnum outside the legal range for the minorversion (e.g. 0, 1, 2, or anything above LAST_NFS42_OP); it is deterministic with no race, timing, or memory-layout dependency.\nPR:N - nfsd4_decode_compound() runs during RPC argument decode, before any export permission, filehandle, or NFSv4 state/authorization check in nfsd4_proc_compound(); with the default AUTH_SYS flavor no principal is authenticated, so an unauthenticated network peer reaches this code.\nUI:N - The attacker sends the malformed COMPOUND unilaterally; nothing is required of any local user or administrator on the server.\nS:U - The out-of-bounds pointer and any resulting fault stay within the kernel's own security authority on the NFS server, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:N - Nothing read from the out-of-bounds address is ever encoded into the NFS reply \u2014 the descriptor fields are only tested as flags or used as a call target \u2014 and the offset is a hardcoded constant the attacker cannot steer, so no information is disclosed to the attacker.\nI:N - The bug only forms and stores an out-of-bounds read pointer; no attacker-controlled data is written anywhere and no kernel memory is modified.\nA:H - The wild pointer points roughly 550 KB past a const array in nfsd's module mapping, and any dereference of it (e.g. the indirect call OPDESC(op)->op_rsize_bop() in nfsd4_max_reply(), which is protected only by an easily-missed open-coded OP_ILLEGAL check) faults in an nfsd kthread and takes the NFS service down. A remote unauthenticated attacker can repeat the request at will, so the availability impact is scored High."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfs4xdr.c"], "versions": [{"version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8", "lessThan": "50827896c365e0f6c8b55ed56d444dafd87c92c5", "status": "affected", "versionType": "git"}, {"version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8", "lessThan": "a64160124d5a078be0c380b1e8a0bad2d040d3a1", "status": "affected", "versionType": "git"}, {"version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8", "lessThan": "ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e", "status": "affected", "versionType": "git"}, {"version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8", "lessThan": "f352c41fa718482979e7e6b71b4da2b718e381cc", "status": "affected", "versionType": "git"}, {"version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8", "lessThan": "804d8e0a6e54427268790472781e03bc243f4ee3", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfs4xdr.c"], "versions": [{"version": "4.14", "status": "affected"}, {"version": "0", "lessThan": "4.14", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.220", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.107", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.24", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.2.11", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.3", "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": "4.14", "versionEndExcluding": "5.10.220"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "5.15.107"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.1.24"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.2.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/50827896c365e0f6c8b55ed56d444dafd87c92c5"}, {"url": "https://git.kernel.org/stable/c/a64160124d5a078be0c380b1e8a0bad2d040d3a1"}, {"url": "https://git.kernel.org/stable/c/ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e"}, {"url": "https://git.kernel.org/stable/c/f352c41fa718482979e7e6b71b4da2b718e381cc"}, {"url": "https://git.kernel.org/stable/c/804d8e0a6e54427268790472781e03bc243f4ee3"}], "title": "NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2023-53680", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-15T21:36:29.078436Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:41:33.489Z"}}]}}

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Any host able to reach the NFS server can supply the malformed opnum.\nAC:L - Triggering requires only a single COMPOUND request carrying an opnum outside the legal range for the minorversion (e.g. 0, 1, 2, or anything above LAST_NFS42_OP); it is deterministic with no race, timing, or memory-layout dependency.\nPR:N - nfsd4_decode_compound() runs during RPC argument decode, before any export permission, filehandle, or NFSv4 state/authorization check in nfsd4_proc_compound(); with the default AUTH_SYS flavor no principal is authenticated, so an unauthenticated network peer reaches this code.\nUI:N - The attacker sends the malformed COMPOUND unilaterally; nothing is required of any local user or administrator on the server.\nS:U - The out-of-bounds pointer and any resulting fault stay within the kernel's own security authority on the NFS server, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:N - Nothing read from the out-of-bounds address is ever encoded into the NFS reply \u2014 the descriptor fields are only tested as flags or used as a call target \u2014 and the offset is a hardcoded constant the attacker cannot steer, so no information is disclosed to the attacker.\nI:N - The bug only forms and stores an out-of-bounds read pointer; no attacker-controlled data is written anywhere and no kernel memory is modified.\nA:H - The wild pointer points roughly 550 KB past a const array in nfsd's module mapping, and any dereference of it (e.g. the indirect call OPDESC(op)->op_rsize_bop() in nfsd4_max_reply(), which is protected only by an easily-missed open-coded OP_ILLEGAL check) faults in an nfsd kthread and takes the NFS service down. A remote unauthenticated attacker can repeat the request at will, so the availability impact is scored High."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8", "lessThan": "50827896c365e0f6c8b55ed56d444dafd87c92c5", "versionType": "git"}, {"status": "affected", "version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8", "lessThan": "a64160124d5a078be0c380b1e8a0bad2d040d3a1", "versionType": "git"}, {"status": "affected", "version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8", "lessThan": "ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e", "versionType": "git"}, {"status": "affected", "version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8", "lessThan": "f352c41fa718482979e7e6b71b4da2b718e381cc", "versionType": "git"}, {"status": "affected", "version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8", "lessThan": "804d8e0a6e54427268790472781e03bc243f4ee3", "versionType": "git"}], "programFiles": ["fs/nfsd/nfs4xdr.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.14"}, {"status": "unaffected", "version": "0", "lessThan": "4.14", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.220", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.107", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.24", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.2.11", "versionType": "semver", "lessThanOrEqual": "6.2.*"}, {"status": "unaffected", "version": "6.3", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/nfsd/nfs4xdr.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/50827896c365e0f6c8b55ed56d444dafd87c92c5"}, {"url": "https://git.kernel.org/stable/c/a64160124d5a078be0c380b1e8a0bad2d040d3a1"}, {"url": "https://git.kernel.org/stable/c/ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e"}, {"url": "https://git.kernel.org/stable/c/f352c41fa718482979e7e6b71b4da2b718e381cc"}, {"url": "https://git.kernel.org/stable/c/804d8e0a6e54427268790472781e03bc243f4ee3"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL\n\nOPDESC() simply indexes into nfsd4_ops[] by the op's operation\nnumber, without range checking that value. 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It assumes callers are\ncareful to avoid calling it with an out-of-bounds opnum value.\n\nnfsd4_decode_compound() is not so careful, and can invoke OPDESC()\nwith opnum set to OP_ILLEGAL, which is 10044 -- well beyond the end\nof nfsd4_ops[]."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nNFSD: Evitar llamar a OPDESC() con ops -> opnum == OP_ILLEGAL\n\nOPDESC() simplemente indexa en nfsd4_ops[] por el n\u00famero de operaci\u00f3n de la op, sin comprobar el rango de ese valor. Asume que los llamadores son cuidadosos para evitar llamarla con un valor de opnum fuera de l\u00edmites.\n\nnfsd4_decode_compound() no es tan cuidadosa, y puede invocar a OPDESC() con opnum establecido en OP_ILLEGAL, que es 10044 -- mucho m\u00e1s all\u00e1 del final de nfsd4_ops[]."}], "id": "CVE-2023-53680", "lastModified": "2026-10-28T20:10:00.163", "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": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-53680", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:36:29.078436Z", "version": "2.0.3"}}]}, "published": "2025-10-07T16:15:52.160", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/50827896c365e0f6c8b55ed56d444dafd87c92c5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/804d8e0a6e54427268790472781e03bc243f4ee3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a64160124d5a078be0c380b1e8a0bad2d040d3a1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f352c41fa718482979e7e6b71b4da2b718e381cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL", "id": "2402213", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2402213"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2023-53680", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "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": "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": "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"}, {"cpe": "cpe:/o:redhat:rhivos:1", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat In-Vehicle Operating System 1"}], "public_date": "2025-10-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-53680\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53680\nhttps://lore.kernel.org/linux-cve-announce/2025100708-CVE-2023-53680-501d@gregkh/T"], "threat_severity": "Important"}

{"created": "2025-10-08T13:35:23.744078+00:00", "updated": "2025-10-08T13:35:23.744102+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}