CVE-2026-90321Hinoki check available

Kernel memory corruption via unchecked inline xattrs

Published Sep 17, 2026 · Updated Sep 18, 2026

Use-after-free in Linux 2.6.28 through 7.2.5 allows context-dependent attackers to read or corrupt kernel memory via crafted OCFS2 metadata. ocfs2_validate_inode_block accepts unchecked inline xattr name and value bounds, so getxattr or listxattr walks beyond inline storage. Exploitation requires a victim to mount an attacker-crafted OCFS2 image and access its extended attributes, which can expose or corrupt kernel memory or crash the host.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in Linux 2.6.28 through 7.2.5 allows context-dependent attackers to read or corrupt kernel memory via crafted OCFS2 metadata. ocfs2_validate_inode_block accepts unchecked inline xattr name and value bounds, so getxattr or listxattr walks beyond inline storage. Exploitation requires a victim to mount an attacker-crafted OCFS2 image and access its extended attributes, which can expose or corrupt kernel memory or crash the host.

The record

CVE
CVE-2026-90321
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=2.6.28
  2. Affected versionversion=cf1d6c763fbcb115263114302485ad17e7933d87 <3fd45b24879fa4885b66a582a6e47eda67f11310
  3. Affected versionversion=cf1d6c763fbcb115263114302485ad17e7933d87 <8914a3330b72378136c2c02d6328a826f6abdad7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.28; version=cf1d6c763fbcb115263114302485ad17e7933d87 <3fd45b24879fa4885b66a582a6e47eda67f11310; version=cf1d6c763fbcb115263114302485ad17e7933d87 <8914a3330b72378136c2c02d6328a826f6abdad7

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

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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