CVE-2026-90205Hinoki check available

Kernel memory corruption via unchecked OCFS2 orphan slot

Published Sep 17, 2026 · Updated Sep 18, 2026

Out-of-bounds access in the Linux OCFS2 driver allows attackers to corrupt kernel memory by supplying a crafted filesystem volume. ocfs2_validate_inode_block() accepts an active i_orphaned_slot beyond osb->max_slots, and ocfs2_wipe_inode() uses it to index osb_orphan_wipes and the system-inode cache. A privileged user must mount the attacker-supplied volume; orphan recovery can disclose adjacent slab data, overwrite memory, or crash the host.

CVSS severity7.8
High
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds access in the Linux OCFS2 driver allows attackers to corrupt kernel memory by supplying a crafted filesystem volume. ocfs2_validate_inode_block() accepts an active i_orphaned_slot beyond osb->max_slots, and ocfs2_wipe_inode() uses it to index osb_orphan_wipes and the system-inode cache. A privileged user must mount the attacker-supplied volume; orphan recovery can disclose adjacent slab data, overwrite memory, or crash the host.

The record

CVE
CVE-2026-90205
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=2.6.16
  2. Affected versionversion=b4df6ed8db0c387d38292e31f00adc4cd297ed5a <3d7c4b7ce7b4baedfd8699fa692cd95f77d332de
  3. Affected versionversion=b4df6ed8db0c387d38292e31f00adc4cd297ed5a <b2d31acbd3b182755b019183fb46949ba5e39b9f
  4. Affected versionversion=b4df6ed8db0c387d38292e31f00adc4cd297ed5a <c6c908f9b4edfb04534b15573168ae038f7a9cbf

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.16; version=b4df6ed8db0c387d38292e31f00adc4cd297ed5a <3d7c4b7ce7b4baedfd8699fa692cd95f77d332de; version=b4df6ed8db0c387d38292e31f00adc4cd297ed5a <b2d31acbd3b182755b019183fb46949ba5e39b9f; version=b4df6ed8db0c387d38292e31f00adc4cd297ed5a <c6c908f9b4edfb04534b15573168ae038f7a9cbf

Published CVSS scores

7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:N/UI:R/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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