CVE-2026-89697Network attack vector

Unspecified impact via unreferenced NFS mount write

Published Sep 11, 2026 · Updated Sep 11, 2026

Improper mount write handling in affected Linux kernels allows attackers to cause unspecified impact via an NFSv2 SETATTR request. Within nfsd_proc_setattr(), the BOTH_TIME_SET branch verifies the file handle early, causing nfsd_setattr() to skip fh_want_write() before notify_change(). The request must reach that timestamp path; the upstream record does not disclose the resulting security consequence beyond the unreferenced mount write.

CVSS severityUnavailable
Unscored
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper mount write handling in affected Linux kernels allows attackers to cause unspecified impact via an NFSv2 SETATTR request. Within nfsd_proc_setattr(), the BOTH_TIME_SET branch verifies the file handle early, causing nfsd_setattr() to skip fh_want_write() before notify_change(). The request must reach that timestamp path; the upstream record does not disclose the resulting security consequence beyond the unreferenced mount write.

The record

CVE
CVE-2026-89697
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1cb57d81cf20fe24b9e2e1daf57bfbdc24b77cd8
  2. Affected versionversion=3.18.46 <3.19
  3. Affected versionversion=4.2
  4. Affected versionversion=cc265089ce1b176dde963c74b53593446ee7f99a <15ca3b64a69caa6194bed8f98a20ed90a11c11dd
  5. Affected versionversion=cc265089ce1b176dde963c74b53593446ee7f99a <4e475be769aa9f7a2c1ce55a2b8592cfccacddcc
  6. Affected versionversion=cc265089ce1b176dde963c74b53593446ee7f99a <533964d420d385e11b08dd4c56c66ef5dcccaf08
  7. Affected versionversion=cc265089ce1b176dde963c74b53593446ee7f99a <c4a409b86a92815181a8e9395c6bf1696ad19175

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=1cb57d81cf20fe24b9e2e1daf57bfbdc24b77cd8; version=3.18.46 <3.19; version=4.2; version=cc265089ce1b176dde963c74b53593446ee7f99a <15ca3b64a69caa6194bed8f98a20ed90a11c11dd; version=cc265089ce1b176dde963c74b53593446ee7f99a <4e475be769aa9f7a2c1ce55a2b8592cfccacddcc; version=cc265089ce1b176dde963c74b53593446ee7f99a <533964d420d385e11b08dd4c56c66ef5dcccaf08; version=cc265089ce1b176dde963c74b53593446ee7f99a <c4a409b86a92815181a8e9395c6bf1696ad19175

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo