CVE-2026-53130

Kernel memory corruption via OMFS size underflow

Published Jun 24, 2026 · Updated Jun 24, 2026

Integer underflow in OMFS support in affected Linux Kernel releases allows local users to corrupt kernel memory through a crafted filesystem image. omfs_make_empty() subtracts OMFS_DIR_START from an unchecked smaller unsigned s_sys_blocksize and passes the wrapped value to memset(), producing an approximately 4 GiB overwrite beyond the block buffer. Processing the malformed image as OMFS triggers the overwrite and can crash the kernel or corrupt kernel-managed data.

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

Integer underflow in OMFS support in affected Linux Kernel releases allows local users to corrupt kernel memory through a crafted filesystem image. omfs_make_empty() subtracts OMFS_DIR_START from an unchecked smaller unsigned s_sys_blocksize and passes the wrapped value to memset(), producing an approximately 4 GiB overwrite beyond the block buffer. Processing the malformed image as OMFS triggers the overwrite and can crash the kernel or corrupt kernel-managed data.

The record

CVE
CVE-2026-53130
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-191
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=2.6.27
  2. Affected versionversion=a3ab7155ea21aadc8a4d5687e91b3d876973185e <0621c385fda1376e967f37ccd534c26c3e511d14
  3. Affected versionversion=a3ab7155ea21aadc8a4d5687e91b3d876973185e <131ea3e57fc22936ed0e2c8330f2e36106172f51
  4. Affected versionversion=a3ab7155ea21aadc8a4d5687e91b3d876973185e <5822a05a841a10794ad818620dd2af490b0705d3
  5. Affected versionversion=a3ab7155ea21aadc8a4d5687e91b3d876973185e <6561afc38398e3518a29c5eebb975c30468f98a6
  6. Affected versionversion=a3ab7155ea21aadc8a4d5687e91b3d876973185e <754ff1bea3819a90c6f33cccfc1a299ef7609f07
  7. Affected versionversion=a3ab7155ea21aadc8a4d5687e91b3d876973185e <79f84af38c9fef9deb0e02c79eb969b5541c2644
  8. Affected versionversion=a3ab7155ea21aadc8a4d5687e91b3d876973185e <817f16ed62bc58a168417bfb5e859c2a370bab03
  9. Affected versionversion=a3ab7155ea21aadc8a4d5687e91b3d876973185e <fbc72f5c645155dc2ed3573243ed20f9913e3a54

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.27; version=a3ab7155ea21aadc8a4d5687e91b3d876973185e <0621c385fda1376e967f37ccd534c26c3e511d14; version=a3ab7155ea21aadc8a4d5687e91b3d876973185e <131ea3e57fc22936ed0e2c8330f2e36106172f51; version=a3ab7155ea21aadc8a4d5687e91b3d876973185e <5822a05a841a10794ad818620dd2af490b0705d3; version=a3ab7155ea21aadc8a4d5687e91b3d876973185e <6561afc38398e3518a29c5eebb975c30468f98a6; version=a3ab7155ea21aadc8a4d5687e91b3d876973185e <754ff1bea3819a90c6f33cccfc1a299ef7609f07; version=a3ab7155ea21aadc8a4d5687e91b3d876973185e <79f84af38c9fef9deb0e02c79eb969b5541c2644; version=a3ab7155ea21aadc8a4d5687e91b3d876973185e <817f16ed62bc58a168417bfb5e859c2a370bab03; version=a3ab7155ea21aadc8a4d5687e91b3d876973185e <fbc72f5c645155dc2ed3573243ed20f9913e3a54

Published CVSS scores

7.8Linux kernel 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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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