CVE-2026-89714Public exploit

Host memory exhaustion via failed NFSv4 mounts

Published Sep 11, 2026 · Updated Sep 11, 2026

Memory leakage in the Linux kernel NFSv4 client in 6.17 allows local users with mount privileges to exhaust kernel memory. During nfs4_server_common_setup(), intermediate failures occur before server->destroy is assigned, so nfs_free_server() skips freeing delegation_hash_table. Each failed NFSv4 mount leaks about 4 KiB of unreclaimable slab, and persistent retries can exhaust kernel memory and interrupt the host.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leakage in the Linux kernel NFSv4 client in 6.17 allows local users with mount privileges to exhaust kernel memory. During nfs4_server_common_setup(), intermediate failures occur before server->destroy is assigned, so nfs_free_server() skips freeing delegation_hash_table. Each failed NFSv4 mount leaks about 4 KiB of unreclaimable slab, and persistent retries can exhaust kernel memory and interrupt the host.

The record

CVE
CVE-2026-89714
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.001
Attack vector
local
Privileges
admin

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=6.17
  2. Affected versionversion=f5b3108e6a14418b120a3c38ca589b8d6cf87627 <0fd2b9687dae36be5b84eab39b4c627bb7ab33b3
  3. Affected versionversion=f5b3108e6a14418b120a3c38ca589b8d6cf87627 <2092f5b38f88be306140c77aeeeb43fc1adacacc
  4. Affected versionversion=f5b3108e6a14418b120a3c38ca589b8d6cf87627 <f3adf1643517357221422c05986d6de5df7b9913

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=6.17; version=f5b3108e6a14418b120a3c38ca589b8d6cf87627 <0fd2b9687dae36be5b84eab39b4c627bb7ab33b3; version=f5b3108e6a14418b120a3c38ca589b8d6cf87627 <2092f5b38f88be306140c77aeeeb43fc1adacacc; version=f5b3108e6a14418b120a3c38ca589b8d6cf87627 <f3adf1643517357221422c05986d6de5df7b9913

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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.001OS Exhaustion Flood

Public exploit references

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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