{"api_version":"1","generated_at":"2026-10-16T22:07:02+00:00","cve":"CVE-2026-89697","urls":{"html":"https://cve.report/CVE-2026-89697","api":"https://cve.report/api/cve/CVE-2026-89697.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89697","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89697"},"summary":{"title":"nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()\n\nThe BOTH_TIME_SET branch calls fh_verify() early so setattr_prepare()\ncan inspect the dentry. This causes nfsd_setattr() to skip\nfh_want_write(), so notify_change() runs without a mount write\nreference.\n\nAdd the missing fh_want_write() call after the early fh_verify().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:56","updated_at":"2026-10-16 20:18:26"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"9.1","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"9.1","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","data":{"baseScore":9.1,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/c4a409b86a92815181a8e9395c6bf1696ad19175","name":"https://git.kernel.org/stable/c/c4a409b86a92815181a8e9395c6bf1696ad19175","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3eec9d791968c177a4a8cda9af5c04f79dae09cb","name":"https://git.kernel.org/stable/c/3eec9d791968c177a4a8cda9af5c04f79dae09cb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d823bf9285cdf4514873b85ab5a888878dd4e8f4","name":"https://git.kernel.org/stable/c/d823bf9285cdf4514873b85ab5a888878dd4e8f4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/15ca3b64a69caa6194bed8f98a20ed90a11c11dd","name":"https://git.kernel.org/stable/c/15ca3b64a69caa6194bed8f98a20ed90a11c11dd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/533964d420d385e11b08dd4c56c66ef5dcccaf08","name":"https://git.kernel.org/stable/c/533964d420d385e11b08dd4c56c66ef5dcccaf08","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4e475be769aa9f7a2c1ce55a2b8592cfccacddcc","name":"https://git.kernel.org/stable/c/4e475be769aa9f7a2c1ce55a2b8592cfccacddcc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9229d824b938f4fb0ea7a5dddade51735e6fe6f9","name":"https://git.kernel.org/stable/c/9229d824b938f4fb0ea7a5dddade51735e6fe6f9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2150305134889fb2fc25228d35353bd2f6f29500","name":"https://git.kernel.org/stable/c/2150305134889fb2fc25228d35353bd2f6f29500","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89697","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89697","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cc265089ce1b176dde963c74b53593446ee7f99a 3eec9d791968c177a4a8cda9af5c04f79dae09cb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cc265089ce1b176dde963c74b53593446ee7f99a 9229d824b938f4fb0ea7a5dddade51735e6fe6f9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cc265089ce1b176dde963c74b53593446ee7f99a 2150305134889fb2fc25228d35353bd2f6f29500 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cc265089ce1b176dde963c74b53593446ee7f99a d823bf9285cdf4514873b85ab5a888878dd4e8f4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()\n\nThe BOTH_TIME_SET branch calls fh_verify() early so setattr_prepare()\ncan inspect the dentry. This causes nfsd_setattr() to skip\nfh_want_write(), so notify_change() runs without a mount write\nreference.\n\nAdd the missing fh_want_write() call after the early fh_verify()."}],"metrics":[{"cvssV3_1":{"baseScore":9.1,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:N - The bug is in nfsd_proc_setattr(), the in-kernel NFSv2 SETATTR handler. A remote client reaches it by sending an NFSv2 SETATTR RPC over TCP/UDP port 2049 with both atime and mtime set, so no local access to the server is required.\nAC:L - Crafting SETATTR with ATTR_ATIME_SET|ATTR_MTIME_SET and equal timestamps deterministically takes the early fh_verify() path so nfsd_setattr() skips fh_want_write(). The attacker fully controls the RPC; no race or uninfluenced memory layout is required.\nPR:N - Default nfsd exports accept AUTH_SYS and AUTH_NULL with no cryptographic authentication, so the client asserts uid/gid. Any host permitted by the export list can issue SETATTR; this matches prior nfsd CNA scoring as PR:N.\nUI:N - The attacking NFS client issues the SETATTR RPC itself. No administrator or end-user action on the server is required.\nS:U - notify_change() without a mount write reference affects only the exported filesystem in the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is a missing mnt_want_write()/sb_start_write() around notify_change() and commit_metadata(). It does not leak kernel memory, pointers, or file contents beyond ordinary authorized NFS access.\nI:H - nfsd_permission's read-only check does not cover freeze state, so SETATTR including ATTR_SIZE truncate, mode, and ownership updates proceeds on a frozen export and in a remount-ro race, letting a client mutate files and corrupt snapshots when writes should be blocked.\nA:H - Skipping freeze protection lets setattr run during fsfreeze, which can deadlock (inode_lock versus sb_start_write ordering), trigger filesystem withdraw/asserts such as GFS2 adding buffers while frozen, and hang or crash the nfsd thread."}]}],"providerMetadata":{"dateUpdated":"2026-09-14T12:02:04.273Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/3eec9d791968c177a4a8cda9af5c04f79dae09cb"},{"url":"https://git.kernel.org/stable/c/9229d824b938f4fb0ea7a5dddade51735e6fe6f9"},{"url":"https://git.kernel.org/stable/c/2150305134889fb2fc25228d35353bd2f6f29500"},{"url":"https://git.kernel.org/stable/c/d823bf9285cdf4514873b85ab5a888878dd4e8f4"},{"url":"https://git.kernel.org/stable/c/15ca3b64a69caa6194bed8f98a20ed90a11c11dd"},{"url":"https://git.kernel.org/stable/c/533964d420d385e11b08dd4c56c66ef5dcccaf08"},{"url":"https://git.kernel.org/stable/c/c4a409b86a92815181a8e9395c6bf1696ad19175"},{"url":"https://git.kernel.org/stable/c/4e475be769aa9f7a2c1ce55a2b8592cfccacddcc"}],"title":"nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89697","datePublished":"2026-09-11T19:46:15.772Z","dateReserved":"2026-09-11T19:38:34.750Z","dateUpdated":"2026-10-16T19:26:48.967Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:56","lastModifiedDate":"2026-10-16 20:18:26","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.2}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-16T19:26:07.202992Z","id":"CVE-2026-89697","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89697","Ordinal":"1","Title":"nfsd: add fh_want_write() for early-verified SETATTR in nfsd_pro","CVE":"CVE-2026-89697","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89697","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()\n\nThe BOTH_TIME_SET branch calls fh_verify() early so setattr_prepare()\ncan inspect the dentry. This causes nfsd_setattr() to skip\nfh_want_write(), so notify_change() runs without a mount write\nreference.\n\nAdd the missing fh_want_write() call after the early fh_verify().","Type":"Description","Title":"nfsd: add fh_want_write() for early-verified SETATTR in nfsd_pro"}]}}}