CVE-2021-25316

Local migration denial via predictable temporary files

Published Apr 14, 2021 · Updated Sep 17, 2024

Insecure temporary-file handling in SUSE Linux Enterprise Server s390-tools allows local users to prevent VM live migrations. The detach_disks.sh script uses static, predictable temporary filenames instead of creating unique files safely. A low-privileged local user can interfere with those files during disk detachment, causing migration failure without reported confidentiality or integrity impact.

CVSS severity3.3
Low
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure temporary-file handling in SUSE Linux Enterprise Server s390-tools allows local users to prevent VM live migrations. The detach_disks.sh script uses static, predictable temporary filenames instead of creating unique files safely. A low-privileged local user can interfere with those files during disk detachment, causing migration failure without reported confidentiality or integrity impact.

The record

CVE
CVE-2021-25316
Published
Apr 14, 2021
Updated
Sep 17, 2024
Vendor
SUSE
Product
SUSE Linux Enterprise Server
Classifications
CWE-377, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record 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=s390-tools <2.1.0-18.29.1
  2. Affected versionversion=s390-tools <2.11.0-9.20.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

SUSE · SUSE Linux Enterprise Serverversion=s390-tools <2.1.0-18.29.1; version=s390-tools <2.11.0-9.20.1

Published CVSS scores

3.3NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
2.1NVDAV:L/AC:L/Au:N/C:N/I:N/A:P
3.3SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-377Insecure Temporary File
T1499Endpoint Denial of Service

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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