{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53680", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-10-07T15:16:59.664Z", "datePublished": "2025-10-07T15:21:34.626Z", "dateUpdated": "2026-08-05T09:15:31.911Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:15:31.911Z" }, "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. 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 — the descriptor fields are only tested as flags or used as a call target — 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" } } } }