CVE-2026-89697 (GCVE-0-2026-89697)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-10-19 08:51
VLAI
Title
nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr() The BOTH_TIME_SET branch calls fh_verify() early so setattr_prepare() can inspect the dentry. This causes nfsd_setattr() to skip fh_want_write(), so notify_change() runs without a mount write reference. Add the missing fh_want_write() call after the early fh_verify().
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 19:26 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cc265089ce1b176dde963c74b53593446ee7f99a , < 3eec9d791968c177a4a8cda9af5c04f79dae09cb (git)
Affected: cc265089ce1b176dde963c74b53593446ee7f99a , < 9229d824b938f4fb0ea7a5dddade51735e6fe6f9 (git)
Affected: cc265089ce1b176dde963c74b53593446ee7f99a , < 2150305134889fb2fc25228d35353bd2f6f29500 (git)
Affected: cc265089ce1b176dde963c74b53593446ee7f99a , < d823bf9285cdf4514873b85ab5a888878dd4e8f4 (git)
Affected: cc265089ce1b176dde963c74b53593446ee7f99a , < 15ca3b64a69caa6194bed8f98a20ed90a11c11dd (git)
Affected: cc265089ce1b176dde963c74b53593446ee7f99a , < 533964d420d385e11b08dd4c56c66ef5dcccaf08 (git)
Affected: cc265089ce1b176dde963c74b53593446ee7f99a , < c4a409b86a92815181a8e9395c6bf1696ad19175 (git)
Affected: cc265089ce1b176dde963c74b53593446ee7f99a , < 4e475be769aa9f7a2c1ce55a2b8592cfccacddcc (git)
Affected: 1cb57d81cf20fe24b9e2e1daf57bfbdc24b77cd8 (git)
Affected: 3.18.46 , < 3.19 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "current_release_date": "2026-10-22T01:52:42+00:00",
      "cve": "CVE-2026-89697",
      "id": "CVE-2026-89697",
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      "product_status:known_affected": "91",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89697.json",
      "version": "3"
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      "current_release_date": "2026-11-03T17:39:24Z",
      "cve": "CVE-2026-89697",
      "id": "CVE-2026-89697",
      "initial_release_date": "2026-09-12T16:23:31Z",
      "product_status:known_affected": "709",
      "product_status:known_not_affected": "0",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89697",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-89697.json",
      "version": "11"
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    "vulnrichment": {
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                    "options": [
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                      },
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                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T19:26:07.202992Z",
                    "version": "2.0.3"
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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        "cna": {
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              "product": "Linux",
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                  "versionType": "original_commit_for_fix"
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                  "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\u0027s 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."
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        "dateReserved": "2026-09-11T19:38:34.750Z",
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  }
}



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Sightings

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Nomenclature

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