CVE-2026-90320

Kernel memory read via malformed OCFS2 xattrs

Published Sep 17, 2026 · Updated Sep 18, 2026

Use-after-free in Linux OCFS2 2.6.28 through 7.2.5 allows local users to trigger an out-of-range kernel read via corrupted xattr metadata. The external-xattr reader fails to bound non-indexed xh_count and entry offsets or indexed-bucket name and value offsets before listxattr() and getxattr() traverse them. Reachability requires processing a crafted OCFS2 volume and invoking an affected xattr operation; the reproduced result was a KASAN-detected use-after-free read, not demonstrated code execution.

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

What happened

Use-after-free in Linux OCFS2 2.6.28 through 7.2.5 allows local users to trigger an out-of-range kernel read via corrupted xattr metadata. The external-xattr reader fails to bound non-indexed xh_count and entry offsets or indexed-bucket name and value offsets before listxattr() and getxattr() traverse them. Reachability requires processing a crafted OCFS2 volume and invoking an affected xattr operation; the reproduced result was a KASAN-detected use-after-free read, not demonstrated code execution.

The record

CVE
CVE-2026-90320
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 <2cf82b46d5e43be0dfbaac7fa1073cec2fc1f5e6
  3. Affected versionversion=cf1d6c763fbcb115263114302485ad17e7933d87 <9f4129b6905b7d638bbc9eb8013c3989cbe30b7e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.28; version=cf1d6c763fbcb115263114302485ad17e7933d87 <2cf82b46d5e43be0dfbaac7fa1073cec2fc1f5e6; version=cf1d6c763fbcb115263114302485ad17e7933d87 <9f4129b6905b7d638bbc9eb8013c3989cbe30b7e

Published CVSS scores

4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
7.8National Vulnerability DatabaseCVSS: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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