CVE-2026-90318Hinoki check available

Resource exhaustion via leaked parent-reconstruction buffer references

Published Sep 17, 2026 · Updated Sep 17, 2026

Resource leakage in Linux FAT NFS parent reconstruction allows local users to exhaust kernel resources via filesystem operations. In fs/fat/nfs.c, fat_rebuild_parent() consumes the directory entry returned by fat_scan_logstart() without releasing its sinfo.bh buffer-head reference after fat_build_inode(). The path requires a FAT filesystem exported with nfs=nostale_ro; no specific crash or reboot outcome is documented.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Resource leakage in Linux FAT NFS parent reconstruction allows local users to exhaust kernel resources via filesystem operations. In fs/fat/nfs.c, fat_rebuild_parent() consumes the directory entry returned by fat_scan_logstart() without releasing its sinfo.bh buffer-head reference after fat_build_inode(). The path requires a FAT filesystem exported with nfs=nostale_ro; no specific crash or reboot outcome is documented.

The record

CVE
CVE-2026-90318
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-772, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=3.10
  2. Affected versionversion=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <0f18d712ba9c980e05b7e33a27cde4fe3ed2d393
  3. Affected versionversion=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <571ea4263d69df1b48578e4314a828ecd0604755
  4. Affected versionversion=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <5e44b6944e11fd6647f028219ad0be4e85e9acee
  5. Affected versionversion=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <7565e44507634514e3e1899d3acad3de43f7a2c1
  6. Affected versionversion=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <83e98dbf19ab64e8528e101e20f8d50e1aaa68a8
  7. Affected versionversion=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <c6a67aa438179cad40f8ae45469e304338d65c0a
  8. Affected versionversion=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <d2a86329152c69a6200c15b2bf618755f8563826
  9. Affected versionversion=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <e38587d98d1ceac608420052c0cdd901d25878f3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.10; version=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <0f18d712ba9c980e05b7e33a27cde4fe3ed2d393; version=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <571ea4263d69df1b48578e4314a828ecd0604755; version=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <5e44b6944e11fd6647f028219ad0be4e85e9acee; version=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <7565e44507634514e3e1899d3acad3de43f7a2c1; version=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <83e98dbf19ab64e8528e101e20f8d50e1aaa68a8; version=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <c6a67aa438179cad40f8ae45469e304338d65c0a; version=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <d2a86329152c69a6200c15b2bf618755f8563826; version=f1e6fb0ab451dae8523fbb8c119a653b2730e938 <e38587d98d1ceac608420052c0cdd901d25878f3

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.5Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
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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