CVE-2026-89836

Livelock via post-release folio size read

Published Sep 16, 2026 · Updated Sep 16, 2026

Race condition in F2FS in Linux 7.0 allows local users to cause a livelock and corrupt page-cache state during invalidation. In f2fs_get_read_data_folio(), f2fs_folio_put() unlocks and releases the large folio before folio_nr_pages() computes the invalidation range, allowing concurrent truncation or splitting to make that range too small. The affected path requires F2FS read-only large-folio support on an immutable file; stale xarray entries can then cause bad page state or a persistent livelock during truncate or reclaim.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in F2FS in Linux 7.0 allows local users to cause a livelock and corrupt page-cache state during invalidation. In f2fs_get_read_data_folio(), f2fs_folio_put() unlocks and releases the large folio before folio_nr_pages() computes the invalidation range, allowing concurrent truncation or splitting to make that range too small. The affected path requires F2FS read-only large-folio support on an immutable file; stale xarray entries can then cause bad page state or a persistent livelock during truncate or reclaim.

The record

CVE
CVE-2026-89836
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=05e65c14ea59a401cec4284e9d612f9d5dc1b3f8 <0dab71381f1b4d12dc2056f8bd5aaa9d93ce9082
  2. Affected versionversion=05e65c14ea59a401cec4284e9d612f9d5dc1b3f8 <cc34df18da92f68f9b384c3ae95ad64be46cb5ee
  3. Affected versionversion=7.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=05e65c14ea59a401cec4284e9d612f9d5dc1b3f8 <0dab71381f1b4d12dc2056f8bd5aaa9d93ce9082; version=05e65c14ea59a401cec4284e9d612f9d5dc1b3f8 <cc34df18da92f68f9b384c3ae95ad64be46cb5ee; version=7.0

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.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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