{ "document": { "aggregate_severity": { "text": "Critical" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/amazonlinux2els/vex/2026/cve-2026-89666-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:40:33Z", "generator": { "date": "2026-11-07T21:40:33Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-89666-ELS_OS-AMAZONLINUX2ELS", "initial_release_date": "2026-09-11T20:19:00Z", "revision_history": [ { "date": "2026-09-11T20:19:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-11-07T21:40:33Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-89666", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: reject out-of-range nseconds in NFSv3 SETATTR and create ops\n\nA client can send an NFSv3 SETATTR, CREATE, MKDIR, SYMLINK or MKNOD\ncarrying an atime or mtime whose nseconds field is out of range. The\nvalue is well-formed on the wire and decodes cleanly into a valid\nuint32, but it is not a valid timespec64: tv_nsec must be less than\nNSEC_PER_SEC.\n\nNothing in the setattr path clamps it. notify_change() runs the time\nthrough timestamp_truncate(), which does not reduce tv_nsec below\nNSEC_PER_SEC when the filesystem supports nanosecond granularity\n(s_time_gran == 1), and the inode atime/mtime setters store it verbatim\n(only ctime is normalized, via inode_set_ctime_to_ts()). The\nun-normalized value then corrupts on-disk metadata: ext4's\next4_encode_extra_time() shifts tv_nsec left by EXT4_EPOCH_BITS, which\noverflows the 32-bit extra field and clobbers the seconds-epoch bits, so\nthe stored seconds (and thus the year) are wrong on read-back. XFS with\nbigtime mis-stores the timestamp for the same reason.\n\nValidate the client-supplied atime/mtime in the proc handlers and return\nNFS3ERR_INVAL before anything is changed. RFC 1813 lists NFS3ERR_INVAL\nfor SETATTR and describes it as the error for a value the server 'can\nnot store ... in its own representation'; the client maps it to EINVAL.\n\nChecking in the proc handlers, rather than in nfsd_setattr(), keeps the\nrejection in front of object creation. The create operations create the\nobject before nfsd_create_setattr() runs, so a late failure would leave\nthe new object behind and turn a non-idempotent request into a namespace\nchange that reports failure. The check is therefore done up front, for\nthe create operations before the object is created.\n\ntv_nsec is a long, so the comparison casts it to unsigned long (the same\nwidth) rather than to u32, matching timespec64_valid(). A u32 cast would\ntruncate on 64-bit; the unsigned long cast also rejects a value that\nbecame negative when an out-of-range u32 wire nseconds was assigned to a\n32-bit long.\n\nOnly client-supplied times are checked: SET_TO_SERVER_TIME requests\ncarry no client value. The sattrguard3 ctime is deliberately left alone:\nan out-of-range guard simply never matches the object's ctime and yields\nNFS3ERR_NOT_SYNC via the existing guardtime comparison, which is the\nprotocol-correct outcome rather than rejecting the request.", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "Amazon-Linux-2:bpftool-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64" ], "known_affected": [ 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URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-89666" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/54e02f5e32c52fb395f2ee02986a6c6d5608d22b", "url": "https://git.kernel.org/stable/c/54e02f5e32c52fb395f2ee02986a6c6d5608d22b" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/55341d8a5a0f5853e70d46f5a55cf06007808f1d", "url": "https://git.kernel.org/stable/c/55341d8a5a0f5853e70d46f5a55cf06007808f1d" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/98fc1d21a7b80324ba64b949ac6bcc00364dd068", "url": "https://git.kernel.org/stable/c/98fc1d21a7b80324ba64b949ac6bcc00364dd068" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/cacda0762d7af24a27f7265711bc05095ece56b9", "url": "https://git.kernel.org/stable/c/cacda0762d7af24a27f7265711bc05095ece56b9" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/e2543852152bcf9aeb57da17d9f9219f7df8aafb", "url": "https://git.kernel.org/stable/c/e2543852152bcf9aeb57da17d9f9219f7df8aafb" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/eb0eca7720662ba5847df1510e73801f7f473094", "url": "https://git.kernel.org/stable/c/eb0eca7720662ba5847df1510e73801f7f473094" } ], "release_date": "2026-09-11T20:19:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-11-05T12:53:42.499096Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1793883221", "product_ids": [ "Amazon-Linux-2:bpftool-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", 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