CVE-2026-89681Network attack vectorHinoki check available

Kernel memory exhaustion via layout stateid leak

Published Sep 11, 2026 · Updated Sep 11, 2026

Resource leak in Linux kernel 7.1 nfsd allows remote attackers to consume kernel memory by racing NFSv4.1 pNFS layout fence handling. The lm_breaker_timedout() path checks delayed_work_pending() after WORK_STRUCT_PENDING is cleared, takes a duplicate sc_count reference, and coalesces a new worker with the running worker without releasing the extra layout stateid reference. Reachability requires an NFSv4.1 server using pNFS layouts and a client-triggered layout fence; repeated races retain kernel objects and can exhaust memory.

CVSS severityUnavailable
Unscored
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Resource leak in Linux kernel 7.1 nfsd allows remote attackers to consume kernel memory by racing NFSv4.1 pNFS layout fence handling. The lm_breaker_timedout() path checks delayed_work_pending() after WORK_STRUCT_PENDING is cleared, takes a duplicate sc_count reference, and coalesces a new worker with the running worker without releasing the extra layout stateid reference. Reachability requires an NFSv4.1 server using pNFS layouts and a client-triggered layout fence; repeated races retain kernel objects and can exhaust memory.

The record

CVE
CVE-2026-89681
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
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

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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=7.1
  2. Affected versionversion=f52792f484ba2316853736856dde19b7e7458861 <8580571227451384399b3fa53fcde19848c48e5a
  3. Affected versionversion=f52792f484ba2316853736856dde19b7e7458861 <a278d361e0e8f242211891193d56483a7a9f47a8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=7.1; version=f52792f484ba2316853736856dde19b7e7458861 <8580571227451384399b3fa53fcde19848c48e5a; version=f52792f484ba2316853736856dde19b7e7458861 <a278d361e0e8f242211891193d56483a7a9f47a8

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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

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Your stack

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