CVE-2026-72132

System-wide write throttling via NFS over-accounting

Published Aug 15, 2026 · Updated Aug 15, 2026

Improper writeback accounting in the Linux NFS client allows local users to force system-wide buffered-write throttling. The nfs_folio_mark_unstable() and nfs_folio_clear_commit() functions charge the full folio page count for every sub-folio request instead of only the pages that request covers. NFS writes that split a large folio into multiple requests can inflate dirty and writeback counters until all buffered writers on the host enter the hard-throttle path, interrupting write service without corrupting data.

CVSS severity5.5
Medium
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

Improper writeback accounting in the Linux NFS client allows local users to force system-wide buffered-write throttling. The nfs_folio_mark_unstable() and nfs_folio_clear_commit() functions charge the full folio page count for every sub-folio request instead of only the pages that request covers. NFS writes that split a large folio into multiple requests can inflate dirty and writeback counters until all buffered writers on the host enter the hard-throttle path, interrupting write service without corrupting data.

The record

CVE
CVE-2026-72132
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-911, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=0c493b5cf16e28d761b6e77c7c32aa0e7af70813 <0ffc032294a29601b1019dba91aa1a930d90df17
  2. Affected versionversion=0c493b5cf16e28d761b6e77c7c32aa0e7af70813 <1f646e23372f3444dc5f0bcb5404a49d26756add
  3. Affected versionversion=0c493b5cf16e28d761b6e77c7c32aa0e7af70813 <27934d02cbeb8a957dd11c985a579e58d30c5270
  4. Affected versionversion=0c493b5cf16e28d761b6e77c7c32aa0e7af70813 <a192b6c149c6ea10cc88869accb78165eb454456
  5. Affected versionversion=0c493b5cf16e28d761b6e77c7c32aa0e7af70813 <a442c258320b689f13d2205eaeeddf8b0e630288
  6. Affected versionversion=6.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0c493b5cf16e28d761b6e77c7c32aa0e7af70813 <0ffc032294a29601b1019dba91aa1a930d90df17; version=0c493b5cf16e28d761b6e77c7c32aa0e7af70813 <1f646e23372f3444dc5f0bcb5404a49d26756add; version=0c493b5cf16e28d761b6e77c7c32aa0e7af70813 <27934d02cbeb8a957dd11c985a579e58d30c5270; version=0c493b5cf16e28d761b6e77c7c32aa0e7af70813 <a192b6c149c6ea10cc88869accb78165eb454456; version=0c493b5cf16e28d761b6e77c7c32aa0e7af70813 <a442c258320b689f13d2205eaeeddf8b0e630288; version=6.3

Published CVSS scores

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

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-911Improper Update of Reference Count
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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