CVE-2008-2544Public exploit

Disputed host-file writes via procfs mount semantics

Published May 27, 2021 · Updated Aug 7, 2024

Reported improper access control in the Linux kernel allows local users to write host files from a chroot through a read-only procfs mount. The report mistakes the shared read-write procfs superblock for the separate per-vfsmount access mode that rejects writes with EROFS. The claim requires local access and mount capability inside a chroot, but Red Hat closed the case as not a bug because the claimed host-file write bypass was not established.

CVSS severity5.5
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reported improper access control in the Linux kernel allows local users to write host files from a chroot through a read-only procfs mount. The report mistakes the shared read-write procfs superblock for the separate per-vfsmount access mode that rejects writes with EROFS. The claim requires local access and mount capability inside a chroot, but Red Hat closed the case as not a bug because the claimed host-file write bypass was not established.

The record

CVE
CVE-2008-2544
Published
May 27, 2021
Updated
Aug 7, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-668
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:P/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere

Public exploit references

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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