CVE-2026-98225

Kernel warning via zeroed shrinker ID

Published Oct 6, 2026 · Updated Oct 6, 2026

A shrinker bounds-check warning in Linux 7.2 allows local users to trigger a kernel warning by faulting a huge page in a memory cgroup. With cgroup.memory=nokmem set, shrinker_memcg_alloc leaves the shrinker ID at zero; __list_lru_init treats it as valid, and set_shrinker_bit encounters an empty map. The condition requires that boot setting and a queued transparent huge page; WARN_ON_ONCE prevents the out-of-bounds read, with no reported crash or data access.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A shrinker bounds-check warning in Linux 7.2 allows local users to trigger a kernel warning by faulting a huge page in a memory cgroup. With cgroup.memory=nokmem set, shrinker_memcg_alloc leaves the shrinker ID at zero; __list_lru_init treats it as valid, and set_shrinker_bit encounters an empty map. The condition requires that boot setting and a queued transparent huge page; WARN_ON_ONCE prevents the out-of-bounds read, with no reported crash or data access.

The record

CVE
CVE-2026-98225
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 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=7.2
  2. Affected versionversion=fafaeceb89a5e2e856ff04c2cacb6cae4a2ecb67 <469c12a69ab1842a9090b6c074ffedbfd9584f9c
  3. Affected versionversion=fafaeceb89a5e2e856ff04c2cacb6cae4a2ecb67 <932cfb25e7ce98d1f93895671ec186a3087e4f80

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=7.2; version=fafaeceb89a5e2e856ff04c2cacb6cae4a2ecb67 <469c12a69ab1842a9090b6c074ffedbfd9584f9c; version=fafaeceb89a5e2e856ff04c2cacb6cae4a2ecb67 <932cfb25e7ce98d1f93895671ec186a3087e4f80

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.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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