CVE-2026-74591Network attack vector

Memory corruption via wrong-index folio insertion

Published Aug 22, 2026 · Updated Aug 25, 2026

Race condition in Linux allows remote attackers to corrupt page-cache mappings through concurrent file I/O and forced memory pressure. In __filemap_add_folio(), repeated xas_set_order() calls leave xa_index rounded down when GFP_NOWAIT allocation drops the lock and a competing thread resolves the conflict before retry. Access to the same file offsets over NFS or SMB is sufficient; wrong-index folio insertion can expose or alter page and executable data and crash processes or the host.

CVSS severity9.8
Critical
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux allows remote attackers to corrupt page-cache mappings through concurrent file I/O and forced memory pressure. In __filemap_add_folio(), repeated xas_set_order() calls leave xa_index rounded down when GFP_NOWAIT allocation drops the lock and a competing thread resolves the conflict before retry. Access to the same file offsets over NFS or SMB is sufficient; wrong-index folio insertion can expose or alter page and executable data and crash processes or the host.

The record

CVE
CVE-2026-74591
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-367, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=200a89c159a7a416115e6e309183c82183bf98aa <267ecd2eb7759c26f1a026eb0a5b231071534c9c
  2. Affected versionversion=200a89c159a7a416115e6e309183c82183bf98aa <4917e3ebcab50f0265e8ca01c8567de4c4a47511
  3. Affected versionversion=200a89c159a7a416115e6e309183c82183bf98aa <86da3f7e1e609e1e8bfbab198af68467c5a015a5
  4. Affected versionversion=6.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=200a89c159a7a416115e6e309183c82183bf98aa <267ecd2eb7759c26f1a026eb0a5b231071534c9c; version=200a89c159a7a416115e6e309183c82183bf98aa <4917e3ebcab50f0265e8ca01c8567de4c4a47511; version=200a89c159a7a416115e6e309183c82183bf98aa <86da3f7e1e609e1e8bfbab198af68467c5a015a5; version=6.15

Published CVSS scores

9.8Linux Kernel CVE TeamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use Race Condition
T1190Exploit Public-Facing Application

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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