CVE-2026-43076

Kernel use-after-free via unchecked inline data size

Published May 6, 2026 · Updated May 6, 2026

Use-after-free in Linux Kernel OCFS2 allows local users to access freed kernel memory through a crafted filesystem image. ocfs2_validate_inode_block() accepts inline-data inodes whose i_size exceeds id_count, causing directory iteration beyond the inline buffer. Triggering requires another user or privileged component to mount and enumerate the malformed image; controlled code execution is not documented.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux Kernel OCFS2 allows local users to access freed kernel memory through a crafted filesystem image. ocfs2_validate_inode_block() accepts inline-data inodes whose i_size exceeds id_count, causing directory iteration beyond the inline buffer. Triggering requires another user or privileged component to mount and enumerate the malformed image; controlled code execution is not documented.

The record

CVE
CVE-2026-43076
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1524af3685b35feac76662cc551cbc37bd14775f
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <37f074e65f24f10f8d8df224a572e4cb9e6faf63
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <77d0295725109d77f5854ef5b58c0d06c08168cc
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cd2d765aa7157f852999842af32148128c735d39

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1524af3685b35feac76662cc551cbc37bd14775f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <37f074e65f24f10f8d8df224a572e4cb9e6faf63; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <77d0295725109d77f5854ef5b58c0d06c08168cc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cd2d765aa7157f852999842af32148128c735d39

Published CVSS scores

7.8kernel.orgCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

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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