{"id":"CVE-2026-89665","summary":"nfsd: reject out-of-range useconds in NFSv2 SETATTR/CREATE","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: reject out-of-range useconds in NFSv2 SETATTR/CREATE\n\nThe NFSv2 sattr decoder converts the wire useconds to nanoseconds in\nsvcxdr_decode_sattr():\n\n\tiap-\u003eia_atime.tv_nsec = tmp2 * NSEC_PER_USEC;\n\ntmp2 is a u32 and NSEC_PER_USEC is 1000, so the product is computed in\nunsigned long. On ILP32 that is 32 bits, and an out-of-range useconds\nvalue such as 4294968 wraps to tv_nsec == 704. The corruption therefore\nhappens during decode, before any proc function can inspect the value,\nand a later range check on tv_nsec would see an in-range result and\naccept it. Rejecting in the decoder yields an RPC GARBAGE_ARGS reply.\nNFSv2 defines no NFSERR_INVAL, so there is no NFS-level status to return\nfor a malformed time argument, and the check cannot move to the proc\nfunction the way the v3/v4 nsec range checks do.\n\nGuard the raw useconds before the multiplication and reject values\ngreater than 1000000. useconds == 1000000 is kept: it is the Sun\nconvention for \"set to the current server time\", and the in-tree Linux\nNFSv2 client emits it in both the atime and the mtime field for a plain\ntouch / utimes(file, NULL) (see encode_sattr() and\nxdr_encode_current_server_time() in fs/nfs/nfs2xdr.c). Rejecting 1000000\nwould turn that common operation into a hard decode failure for both\nSETATTR and CREATE. 1000000 * NSEC_PER_USEC is 10^9, which does not wrap\non ILP32, so the Sun convention value passes through safely. Only\ngenuinely out-of-range values (\u003e 1000000) are rejected. The atime and\nmtime guards are therefore symmetric.\n\nThe decoder only applied the Sun convention in the mtime block, which\nclears ATTR_ATIME_SET|ATTR_MTIME_SET when mtime useconds == 1000000. If a\nclient puts 1000000 in the atime field but not in the mtime field, the\natime block stored an out-of-range tv_nsec (10^9) and left ATTR_ATIME_SET\nset, so the bogus value reached the filesystem. Apply the convention in\nthe atime block as well, clearing ATTR_ATIME_SET so the server uses its\ncurrent time and ignores the value. Only ATTR_ATIME_SET is cleared there.\nThe mtime block keeps its existing behavior, where 1000000 means \"set\nboth atime and mtime to now\".\n\n[ cel: various tweaks, addenda, and clean-ups ]","modified":"2026-09-13T03:47:20.405066726Z","published":"2026-09-11T19:45:52.102Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89665.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1195483965a5f63d2dde18054ec7e50a23b9071c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/26709c8ffe73772eb69e68d553ac71d91228dccc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a937dd1aa2d92291fe0a1860d17e90d8f206cd22"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ad02d095439f89cbd6629420c7e3ba476457b83b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89665.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89665"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"},{"fixed":"a937dd1aa2d92291fe0a1860d17e90d8f206cd22"},{"fixed":"ad02d095439f89cbd6629420c7e3ba476457b83b"},{"fixed":"1195483965a5f63d2dde18054ec7e50a23b9071c"},{"fixed":"26709c8ffe73772eb69e68d553ac71d91228dccc"}]}],"versions":["v7.2.3","v6.18.49","v6.12.108","v7.2.2","v6.18.48","v6.12.107","v7.2","v7.2.1","v6.18.47","v6.12.106","v6.18.46","v6.12.105","v6.18.45","v6.12.104","v7.2-rc1","v7.2-rc5","v6.18.44","v6.12.103","v7.2-rc7","v7.2-rc2","v7.2-rc6","v7.2-rc3","v6.18.43","v6.12.102","v6.12.101","v6.18.42","v7.2-rc4","v6.18.41","v6.12.100","v6.18.40","v6.12.99","v6.12.98","v6.12.97","v6.18.39","v6.12.96","v6.18.38","v6.12.95","v6.18.37","v6.12.94","v6.18.36","v7.1","v7.1-rc1","v6.18.35","v6.12.93","v7.1-rc7","v7.1-rc6","v7.1-rc4","v7.1-rc3","v6.18.34","v6.12.92","v7.1-rc2","v7.1-rc5","v6.18.33","v6.12.91","v6.18.32","v6.12.90","v7.0","v6.18.31","v6.12.89","v6.18.30","v6.12.88","v6.18.29","v6.12.87","v6.18.28","v6.18.27","v6.12.86","v6.18.26","v6.12.85","v7.0-rc1","v6.12.84","v6.18.25","v6.18.24","v6.12.83","v6.18.23","v6.12.82","v6.18.22","v6.12.81","v7.0-rc5","v7.0-rc6","v6.18.21","v6.12.80","v7.0-rc7","v7.0-rc3","v7.0-rc4","v6.19-rc2","v6.18.20","v6.12.79","v7.0-rc2","v6.19","v6.12.78","v6.18.19","v6.12.77","v6.18.18","v6.18.17","v6.12.76","v6.18.16","v6.12.75","v6.18.15","v6.12.74","v6.18.14","v6.18.13","v6.18.12","v6.12.73","v6.18.11","v6.12.72","v6.18.10","v6.12.71","v6.12.70","v6.18.9","v6.12.69","v6.19-rc8","v6.19-rc1","v6.19-rc6","v6.18.8","v6.12.68","v6.19-rc7","v6.19-rc5","v6.19-rc4","v6.18.7","v6.12.67","v6.19-rc3","v6.18.6","v6.12.66","v6.18.5","v6.12.65","v6.18.4","v6.12.64","v6.18.3","v6.12.63","v6.18.2","v6.18.1","v6.12.62","v6.18","v6.12.61","v6.18-rc1","v6.12.60","v6.18-rc7","v6.18-rc3","v6.12.59","v6.18-rc5","v6.18-rc6","v6.18-rc2","v6.12.58","v6.18-rc4","v6.12.57","v6.12.56","v6.12.55","v6.12.54","v6.12.53","v6.12.52","v6.12.51","v6.17","v6.17-rc7","v6.12.50","v6.17-rc1","v6.17-rc2","v6.12.49","v6.17-rc6","v6.17-rc4","v6.17-rc5","v6.17-rc3","v6.16","v6.12.48","v6.12.47","v6.12.46","v6.12.45","v6.12.44","v6.12.43","v6.12.42","v6.12.41","v6.16-rc6","v6.12.40","v6.16-rc1","v6.16-rc4","v6.16-rc2","v6.16-rc5","v6.16-rc7","v6.16-rc3","v6.12.39","v6.14-rc3","v6.12.38","v6.12.37","v6.12.36","v6.12.35","v6.12.34","v6.12.33","v6.15","v6.12.32","v6.15-rc1","v6.15-rc6","v6.15-rc3","v6.12.31","v6.12.30","v6.15-rc2","v6.15-rc7","v6.15-rc4","v6.12.29","v6.12.28","v6.15-rc5","v6.12.27","v6.12.26","v6.14","v6.12.25","v6.12.24","v6.12.23","v6.12.22","v6.12.21","v6.14-rc1","v6.14-rc7","v6.14-rc6","v6.12.20","v6.14-rc4","v6.14-rc5","v6.12.19","v6.14-rc2","v6.12.18","v6.12.17","v6.12.16","v6.12.15","v6.13","v6.12.14","v6.13-rc1","v6.12.13","v6.12.12","v6.12.11","v6.13-rc6","v6.12.10","v6.13-rc7","v6.13-rc2","v6.12.9","v6.13-rc5","v6.13-rc3","v6.12.8","v6.12-rc1","v6.13-rc4","v6.12.7","v6.12.6","v6.12.5","v6.12.4","v6.12","v6.12.3","v6.12.2","v6.12.1","v6.12-rc7","v6.12-rc3","v6.12-rc4","v6.12-rc6","v6.12-rc5","v6.12-rc2","v6.11-rc1","v6.11-rc5","v6.11","v6.11-rc7","v6.10-rc1","v6.11-rc6","v6.11-rc3","v6.11-rc4","v6.11-rc2","v6.10","v6.10-rc6","v6.10-rc7","v6.10-rc3","v6.9-rc1","v6.10-rc5","v6.10-rc2","v6.10-rc4","v6.9","v6.9-rc6","v6.9-rc7","v6.9-rc5","v6.9-rc3","v6.9-rc2","v6.8","v6.9-rc4","v6.8-rc1","v6.7-rc1","v6.8-rc7","v6.8-rc6","v6.8-rc5","v6.8-rc4","v6.8-rc3","v6.8-rc2","v6.7","v6.7-rc3","v6.7-rc8","v6.7-rc7","v6.7-rc6","v6.7-rc2","v6.7-rc4","v6.7-rc5","v6.6","v6.6-rc1","v6.6-rc5","v6.6-rc3","v6.6-rc7","v6.6-rc6","v6.6-rc4","v6.6-rc2","v6.5","v6.5-rc1","v6.5-rc2","v6.5-rc7","v6.5-rc4","v6.5-rc3","v6.5-rc6","v6.5-rc5","v6.4","v6.4-rc7","v6.4-rc1","v6.4-rc6","v6.4-rc5","v6.4-rc3","v6.4-rc4","v6.4-rc2","v6.3","v6.3-rc1","v6.3-rc7","v6.3-rc2","v6.3-rc3","v6.3-rc5","v6.3-rc6","v6.3-rc4","v6.2-rc6","v6.2-rc1","v6.2","v6.2-rc2","v6.2-rc8","v6.2-rc5","v6.2-rc4","v6.2-rc7","v6.2-rc3","v6.1-rc1","v6.1","v6.1-rc8","v6.1-rc3","v6.1-rc6"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