{"id":"CVE-2026-89685","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix clock domain mismatch in clients_still_reclaiming()\n\nclients_still_reclaiming() computes a deadline from nn->boot_time\n(CLOCK_REALTIME, ~1.7 billion) but comp…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix clock domain mismatch in clients_still_reclaiming()\n\nclients_still_reclaiming() computes a deadline from nn->boot_time\n(CLOCK_REALTIME, ~1.7 billion) but comp…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-1025"],"vendor":"Linux","product":"Linux","affected":["Linux >= 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf < e92e80c5b043108029bc729b30d12c37158fb9cb","Linux >= 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf < f9cec313efb2fd18d962aad738a4892bce806016","Linux >= 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf < 9843649196221152b6e5d138a3ce859bdaae1d96","Linux >= 20b7d86f29d39e8ae19bb29c24ffee70dc385ddf < 09ea3eb9a518565f5bca386e81b993ed8825f5e8","Linux 5.6"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T14:17:25.203","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89685","references":[{"url":"https://git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e92e80c5b043108029bc729b30d12c37158fb9cb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89685.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89685"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532214"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89685"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89685"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89685.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00446,"epssPercentile":0.38198,"scores":{"nvd":7.5,"cna":7.5,"vendor":7},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89685","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix clock domain mismatch in clients_still_reclaiming()\n\nclients_still_reclaiming() computes a deadline from nn->boot_time\n(CLOCK_REALTIME, ~1.7 billion) but compares it against\nktime_get_boottime_seconds() (CLOCK_BOOTTIME, seconds since boot).\nThe comparison is always false — it would take ~54 years of uptime\nfor BOOTTIME to exceed the REALTIME-derived deadline.\n\nThis means any client can hold the server in grace indefinitely by\nsending CLAIM_PREVIOUS OPEN requests, blocking all non-reclaim\noperations for all other clients.\n\nAdd boot_time_bt (CLOCK_BOOTTIME) alongside the existing boot_time\nand use it for the deadline computation. boot_time (CLOCK_REALTIME)\nis preserved for its cl_boot clientid-nonce role.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89685.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208371,"id":"CVE-2026-89685","ts":1789997912902,"field":"cvss","old":"5.3","new":"7.5"},{"seq":208370,"id":"CVE-2026-89685","ts":1789997912902,"field":"severity","old":"medium","new":"high"},{"seq":202820,"id":"CVE-2026-89685","ts":1789403732538,"field":"cvss","old":"7.5","new":"5.3"},{"seq":202819,"id":"CVE-2026-89685","ts":1789403732538,"field":"severity","old":"high","new":"medium"},{"seq":197744,"id":"CVE-2026-89685","ts":1789384318666,"field":"cvss","old":"5.3","new":"7.5"},{"seq":197743,"id":"CVE-2026-89685","ts":1789384318666,"field":"severity","old":"medium","new":"high"},{"seq":183355,"id":"CVE-2026-89685","ts":1789356675019,"field":"cvss","old":"7.5","new":"5.3"},{"seq":183354,"id":"CVE-2026-89685","ts":1789356675019,"field":"severity","old":"high","new":"medium"},{"seq":153560,"id":"CVE-2026-89685","ts":1789285351286,"field":"cvss","old":null,"new":"7.5"},{"seq":153559,"id":"CVE-2026-89685","ts":1789285351286,"field":"severity","old":"none","new":"high"},{"seq":147548,"id":"CVE-2026-89685","ts":1789270211339,"field":"cvss","old":null,"new":"5.3"},{"seq":147547,"id":"CVE-2026-89685","ts":1789270211339,"field":"severity","old":"none","new":"medium"},{"seq":109304,"id":"CVE-2026-89685","ts":1789183731353,"field":"cvss","old":null,"new":"5.3"},{"seq":109303,"id":"CVE-2026-89685","ts":1789183731353,"field":"severity","old":"none","new":"medium"}]}