{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89685", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.749Z", "datePublished": "2026-09-11T19:46:07.116Z", "dateUpdated": "2026-09-11T19:46:07.116Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:46:07.116Z"}, "descriptions": [{"lang": "en", "value": "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 compares it against\nktime_get_boottime_seconds() (CLOCK_BOOTTIME, seconds since boot).\nThe comparison is always false \u2014 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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/netns.h", "fs/nfsd/nfs4state.c"], "versions": [{"version": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf", "lessThan": "f9cec313efb2fd18d962aad738a4892bce806016", "status": "affected", "versionType": "git"}, {"version": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf", "lessThan": "9843649196221152b6e5d138a3ce859bdaae1d96", "status": "affected", "versionType": "git"}, {"version": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf", "lessThan": "09ea3eb9a518565f5bca386e81b993ed8825f5e8", "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/netns.h", "fs/nfsd/nfs4state.c"], "versions": [{"version": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "5.6", "versionEndExcluding": "6.18.51"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016"}, {"url": "https://git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96"}, {"url": "https://git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8"}], "title": "nfsd: fix clock domain mismatch in clients_still_reclaiming()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/nfsd/netns.h", "fs/nfsd/nfs4state.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "f9cec313efb2fd18d962aad738a4892bce806016", "status": "affected", "version": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf", "versionType": "git"}, {"lessThan": "9843649196221152b6e5d138a3ce859bdaae1d96", "status": "affected", "version": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf", "versionType": "git"}, {"lessThan": "09ea3eb9a518565f5bca386e81b993ed8825f5e8", "status": "affected", "version": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/nfsd/netns.h", "fs/nfsd/nfs4state.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.6"}, {"lessThan": "5.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.51", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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 compares it against\nktime_get_boottime_seconds() (CLOCK_BOOTTIME, seconds since boot).\nThe comparison is always false \u2014 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."}], "id": "CVE-2026-89685", "lastModified": "2026-09-11T20:19:55.420", "metrics": {}, "published": "2026-09-11T20:19:55.420", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: NFS daemon denial of service via clock domain mismatch", "id": "2532214", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532214"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1025", "details": ["A flaw was found in the Linux kernel's Network File System (NFS) daemon (nfsd). A clock domain mismatch in the `clients_still_reclaiming()` function allows a remote attacker to indefinitely hold the server in a grace period. By sending specific `CLAIM_PREVIOUS OPEN` requests, an attacker can block all non-reclaim operations for other clients, leading to a denial of service (DoS)."], "name": "CVE-2026-89685", "public_date": "2026-09-11T19:46:07Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89685\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89685\nhttps://git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8\nhttps://git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96\nhttps://git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[20b7d86f29d39e8ae19bb29c24ffee70dc385ddf,f9cec313efb2fd18d962aad738a4892bce806016)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[20b7d86f29d39e8ae19bb29c24ffee70dc385ddf,9843649196221152b6e5d138a3ce859bdaae1d96)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[20b7d86f29d39e8ae19bb29c24ffee70dc385ddf,09ea3eb9a518565f5bca386e81b993ed8825f5e8)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.6"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.6)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.51,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T11:45:03.768708+00:00", "updated": "2026-09-12T16:45:07.383553+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}