CVE-2026-89679Network attack vector

Unauthenticated kernel oops via delegated timestamp SETATTR

Published Sep 11, 2026 · Updated Sep 11, 2026

NULL pointer dereference in Linux kernel 6.14 nfsd allows remote attackers to trigger a kernel oops via a crafted NFSv4 SETATTR request. nfsd4_setattr() accepts the one stateid for delegated timestamp attributes, leaves st NULL, and dereferences st->sc_type without a NULL check. Any NFSv4 client can reach the flaw without authentication, delegation, or prior state; whether the oops escalates to a panic or reboot depends on kernel settings.

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

What happened

NULL pointer dereference in Linux kernel 6.14 nfsd allows remote attackers to trigger a kernel oops via a crafted NFSv4 SETATTR request. nfsd4_setattr() accepts the one stateid for delegated timestamp attributes, leaves st NULL, and dereferences st->sc_type without a NULL check. Any NFSv4 client can reach the flaw without authentication, delegation, or prior state; whether the oops escalates to a panic or reboot depends on kernel settings.

The record

CVE
CVE-2026-89679
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

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

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Is a vulnerable build present?

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

  1. Affected versionversion=6.14
  2. Affected versionversion=7e13f4f8d27dc02fb88666f603c53ca749d56f92 <3c5119b799a7f57db332b2c31e806de16c869f0f
  3. Affected versionversion=7e13f4f8d27dc02fb88666f603c53ca749d56f92 <3c896db123892256fd39af0ee8c2d02c63539983
  4. Affected versionversion=7e13f4f8d27dc02fb88666f603c53ca749d56f92 <fe456c8c0931bb3e8a03d429920e87fd85747fba

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.14; version=7e13f4f8d27dc02fb88666f603c53ca749d56f92 <3c5119b799a7f57db332b2c31e806de16c869f0f; version=7e13f4f8d27dc02fb88666f603c53ca749d56f92 <3c896db123892256fd39af0ee8c2d02c63539983; version=7e13f4f8d27dc02fb88666f603c53ca749d56f92 <fe456c8c0931bb3e8a03d429920e87fd85747fba

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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