{"api_version":"1","generated_at":"2026-09-18T01:33:58+00:00","cve":"CVE-2026-90103","urls":{"html":"https://cve.report/CVE-2026-90103","api":"https://cve.report/api/cve/CVE-2026-90103.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-90103","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-90103"},"summary":{"title":"NFSv4.2: fix LAYOUTSTATS send buffer exhaustion","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4.2: fix LAYOUTSTATS send buffer exhaustion\n\nencode_layoutstats_maxsz budgets XDR_QUADLEN(PNFS_LAYOUTSTATS_MAXSIZE),\ni.e. 256 bytes, for the layoutupdate4 body written by the layout driver.\nThe flexfiles record can exceed that.\n\nff_layout_encode_ff_layoutupdate() emits, per data server, a netaddr4,\nan nfs_fh4, two ff_io_latency4, an nfstime4 and a bool.  A data server\nwhose filehandle is NFS_MAXFHSIZE bytes long already accounts for 132 of\nthose bytes, and the two ff_io_latency4 at 64 bytes each, the nfstime4\nand the bool add a further 144, so the body passes 256 bytes before the\nnetaddr4 is encoded at all.  encode_layoutstats() additionally writes\nthe deviceid4 and the layoutupdate4 lou_type word, neither of which the\nmacro accounts for.\n\nThe filehandle and the address are both chosen by the server, through\nLAYOUTGET and GETDEVICEINFO, so it can drive the encoder past the\nend of the send buffer.  xdr_reserve_space() returns NULL once that\nhappens, and the two ff_layout_encode_io_latency() calls run with\ndss_info->mirror->lock held, so a NULL return there leaves the lock\npermanently held.\n\nRaise PNFS_LAYOUTSTATS_MAXSIZE to 384 so that the record fits inside the\nreservation.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:17:02","updated_at":"2026-09-17 17:17:02"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/5aca000630c0fd0da102ae1abf9245dd74f2ce36","name":"https://git.kernel.org/stable/c/5aca000630c0fd0da102ae1abf9245dd74f2ce36","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a973622da0c62c34043ddbbf382cd761b03e5136","name":"https://git.kernel.org/stable/c/a973622da0c62c34043ddbbf382cd761b03e5136","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/842ac26615424577f24f0486b9d3bf97f28fad9c","name":"https://git.kernel.org/stable/c/842ac26615424577f24f0486b9d3bf97f28fad9c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/397aa7000bbf6b6a0d32e66a544e978fb478c8e4","name":"https://git.kernel.org/stable/c/397aa7000bbf6b6a0d32e66a544e978fb478c8e4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e82d7d999fe9f893f84bf332fd39cb5d9de7128f","name":"https://git.kernel.org/stable/c/e82d7d999fe9f893f84bf332fd39cb5d9de7128f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3815b894b922e9b4f40b8b6f6d67bf80d44141c9","name":"https://git.kernel.org/stable/c/3815b894b922e9b4f40b8b6f6d67bf80d44141c9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cb11590c7ddc6883a1b1d70b1f98b2779fe626f2","name":"https://git.kernel.org/stable/c/cb11590c7ddc6883a1b1d70b1f98b2779fe626f2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c75ef2137e749f2673f0617cfdaae53b2bb7195a","name":"https://git.kernel.org/stable/c/c75ef2137e749f2673f0617cfdaae53b2bb7195a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90103","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90103","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 27c430644369ccd9a2272492ba6d0e85e2e4800b 842ac26615424577f24f0486b9d3bf97f28fad9c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 27c430644369ccd9a2272492ba6d0e85e2e4800b 397aa7000bbf6b6a0d32e66a544e978fb478c8e4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 27c430644369ccd9a2272492ba6d0e85e2e4800b e82d7d999fe9f893f84bf332fd39cb5d9de7128f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 27c430644369ccd9a2272492ba6d0e85e2e4800b 5aca000630c0fd0da102ae1abf9245dd74f2ce36 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 27c430644369ccd9a2272492ba6d0e85e2e4800b cb11590c7ddc6883a1b1d70b1f98b2779fe626f2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 27c430644369ccd9a2272492ba6d0e85e2e4800b 3815b894b922e9b4f40b8b6f6d67bf80d44141c9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 27c430644369ccd9a2272492ba6d0e85e2e4800b a973622da0c62c34043ddbbf382cd761b03e5136 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 27c430644369ccd9a2272492ba6d0e85e2e4800b c75ef2137e749f2673f0617cfdaae53b2bb7195a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.2","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.270 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.221 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["include/linux/nfs_xdr.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"842ac26615424577f24f0486b9d3bf97f28fad9c","status":"affected","version":"27c430644369ccd9a2272492ba6d0e85e2e4800b","versionType":"git"},{"lessThan":"397aa7000bbf6b6a0d32e66a544e978fb478c8e4","status":"affected","version":"27c430644369ccd9a2272492ba6d0e85e2e4800b","versionType":"git"},{"lessThan":"e82d7d999fe9f893f84bf332fd39cb5d9de7128f","status":"affected","version":"27c430644369ccd9a2272492ba6d0e85e2e4800b","versionType":"git"},{"lessThan":"5aca000630c0fd0da102ae1abf9245dd74f2ce36","status":"affected","version":"27c430644369ccd9a2272492ba6d0e85e2e4800b","versionType":"git"},{"lessThan":"cb11590c7ddc6883a1b1d70b1f98b2779fe626f2","status":"affected","version":"27c430644369ccd9a2272492ba6d0e85e2e4800b","versionType":"git"},{"lessThan":"3815b894b922e9b4f40b8b6f6d67bf80d44141c9","status":"affected","version":"27c430644369ccd9a2272492ba6d0e85e2e4800b","versionType":"git"},{"lessThan":"a973622da0c62c34043ddbbf382cd761b03e5136","status":"affected","version":"27c430644369ccd9a2272492ba6d0e85e2e4800b","versionType":"git"},{"lessThan":"c75ef2137e749f2673f0617cfdaae53b2bb7195a","status":"affected","version":"27c430644369ccd9a2272492ba6d0e85e2e4800b","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/linux/nfs_xdr.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.2"},{"lessThan":"4.2","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.270","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.221","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.188","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.270","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"4.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4.2: fix LAYOUTSTATS send buffer exhaustion\n\nencode_layoutstats_maxsz budgets XDR_QUADLEN(PNFS_LAYOUTSTATS_MAXSIZE),\ni.e. 256 bytes, for the layoutupdate4 body written by the layout driver.\nThe flexfiles record can exceed that.\n\nff_layout_encode_ff_layoutupdate() emits, per data server, a netaddr4,\nan nfs_fh4, two ff_io_latency4, an nfstime4 and a bool.  A data server\nwhose filehandle is NFS_MAXFHSIZE bytes long already accounts for 132 of\nthose bytes, and the two ff_io_latency4 at 64 bytes each, the nfstime4\nand the bool add a further 144, so the body passes 256 bytes before the\nnetaddr4 is encoded at all.  encode_layoutstats() additionally writes\nthe deviceid4 and the layoutupdate4 lou_type word, neither of which the\nmacro accounts for.\n\nThe filehandle and the address are both chosen by the server, through\nLAYOUTGET and GETDEVICEINFO, so it can drive the encoder past the\nend of the send buffer.  xdr_reserve_space() returns NULL once that\nhappens, and the two ff_layout_encode_io_latency() calls run with\ndss_info->mirror->lock held, so a NULL return there leaves the lock\npermanently held.\n\nRaise PNFS_LAYOUTSTATS_MAXSIZE to 384 so that the record fits inside the\nreservation."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:06:13.519Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/842ac26615424577f24f0486b9d3bf97f28fad9c"},{"url":"https://git.kernel.org/stable/c/397aa7000bbf6b6a0d32e66a544e978fb478c8e4"},{"url":"https://git.kernel.org/stable/c/e82d7d999fe9f893f84bf332fd39cb5d9de7128f"},{"url":"https://git.kernel.org/stable/c/5aca000630c0fd0da102ae1abf9245dd74f2ce36"},{"url":"https://git.kernel.org/stable/c/cb11590c7ddc6883a1b1d70b1f98b2779fe626f2"},{"url":"https://git.kernel.org/stable/c/3815b894b922e9b4f40b8b6f6d67bf80d44141c9"},{"url":"https://git.kernel.org/stable/c/a973622da0c62c34043ddbbf382cd761b03e5136"},{"url":"https://git.kernel.org/stable/c/c75ef2137e749f2673f0617cfdaae53b2bb7195a"}],"title":"NFSv4.2: fix LAYOUTSTATS send buffer exhaustion","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-90103","datePublished":"2026-09-17T16:06:13.519Z","dateReserved":"2026-09-11T19:38:34.786Z","dateUpdated":"2026-09-17T16:06:13.519Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:17:02","lastModifiedDate":"2026-09-17 17:17:02","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"90103","Ordinal":"1","Title":"NFSv4.2: fix LAYOUTSTATS send buffer exhaustion","CVE":"CVE-2026-90103","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"90103","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4.2: fix LAYOUTSTATS send buffer exhaustion\n\nencode_layoutstats_maxsz budgets XDR_QUADLEN(PNFS_LAYOUTSTATS_MAXSIZE),\ni.e. 256 bytes, for the layoutupdate4 body written by the layout driver.\nThe flexfiles record can exceed that.\n\nff_layout_encode_ff_layoutupdate() emits, per data server, a netaddr4,\nan nfs_fh4, two ff_io_latency4, an nfstime4 and a bool.  A data server\nwhose filehandle is NFS_MAXFHSIZE bytes long already accounts for 132 of\nthose bytes, and the two ff_io_latency4 at 64 bytes each, the nfstime4\nand the bool add a further 144, so the body passes 256 bytes before the\nnetaddr4 is encoded at all.  encode_layoutstats() additionally writes\nthe deviceid4 and the layoutupdate4 lou_type word, neither of which the\nmacro accounts for.\n\nThe filehandle and the address are both chosen by the server, through\nLAYOUTGET and GETDEVICEINFO, so it can drive the encoder past the\nend of the send buffer.  xdr_reserve_space() returns NULL once that\nhappens, and the two ff_layout_encode_io_latency() calls run with\ndss_info->mirror->lock held, so a NULL return there leaves the lock\npermanently held.\n\nRaise PNFS_LAYOUTSTATS_MAXSIZE to 384 so that the record fits inside the\nreservation.","Type":"Description","Title":"NFSv4.2: fix LAYOUTSTATS send buffer exhaustion"}]}}}