CVE-2026-92502Public exploitHinoki check available

Filesystem warnings via stale writeback tags

Published Sep 17, 2026 · Updated Sep 17, 2026

Stale writeback tags in Linux 6.2 ext4 allow local users to trigger warnings via writes followed by a read-only remount. The mpage_prepare_extent_to_map function skips clean folios without clearing their xarray dirty and towrite tags, allowing later writeback to attempt journal operations on a read-only filesystem. Reproduction requires data=journal mode and reboot timing; the report documents warnings, including a data-loss warning, but does not demonstrate actual data loss or a crash.

CVSS severity2.5
Low
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stale writeback tags in Linux 6.2 ext4 allow local users to trigger warnings via writes followed by a read-only remount. The mpage_prepare_extent_to_map function skips clean folios without clearing their xarray dirty and towrite tags, allowing later writeback to attempt journal operations on a read-only filesystem. Reproduction requires data=journal mode and reboot timing; the report documents warnings, including a data-loss warning, but does not demonstrate actual data loss or a crash.

The record

CVE
CVE-2026-92502
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.2
  2. Affected versionversion=dff4ac75eeeefc4397fe7cf8ce559425bf46b1f7 <43ae387c3ae6a11227d096669ddf883e27a39a11
  3. Affected versionversion=dff4ac75eeeefc4397fe7cf8ce559425bf46b1f7 <a450ab88bfd57b227d72c7a3faad54d16c3fc099
  4. Affected versionversion=dff4ac75eeeefc4397fe7cf8ce559425bf46b1f7 <aa0042630b1f7cab735b0a168539281198822586
  5. Affected versionversion=dff4ac75eeeefc4397fe7cf8ce559425bf46b1f7 <ec524aae479b4b2078c47492b90ec21200bce434
  6. Affected versionversion=dff4ac75eeeefc4397fe7cf8ce559425bf46b1f7 <f82a4929d0ef7ddf254c1c295ec1dfd24094f2de

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=dff4ac75eeeefc4397fe7cf8ce559425bf46b1f7 <43ae387c3ae6a11227d096669ddf883e27a39a11; version=dff4ac75eeeefc4397fe7cf8ce559425bf46b1f7 <a450ab88bfd57b227d72c7a3faad54d16c3fc099; version=dff4ac75eeeefc4397fe7cf8ce559425bf46b1f7 <aa0042630b1f7cab735b0a168539281198822586; version=dff4ac75eeeefc4397fe7cf8ce559425bf46b1f7 <ec524aae479b4b2078c47492b90ec21200bce434; version=dff4ac75eeeefc4397fe7cf8ce559425bf46b1f7 <f82a4929d0ef7ddf254c1c295ec1dfd24094f2de

Published CVSS scores

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 exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

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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