LiveActive security incident?Get immediate response
CVE Record

CVE-2021-25316: Local DoS of VM live migration due to use of static tmp files in detach_disks.sh in s390-tools

A Insecure Temporary File vulnerability in s390-tools of SUSE Linux Enterprise Server 12-SP5, SUSE Linux Enterprise Server 15-SP2 allows local attackers to prevent VM live migrations This issue affects: SUSE Linux Enterprise Server 12-SP5 s390-tools versions prior to 2.1.0-18.29.1. SUSE Linux Enterprise Server 15-SP2 s390-tools versions prior to 2.11.0-9.20.1.

LowCVSS 3.3Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This is a local availability issue in SUSE s390-tools. A logged-in local attacker could interfere with VM live migration, potentially disrupting maintenance or failover operations. The CVE record does not indicate data theft, privilege escalation, remote attack, or active exploitation.

Executive priority

Handle through routine patching, with faster scheduling for virtualization hosts where failed live migration would disrupt maintenance or resilience plans. This is not an emergency based on supplied evidence.

Technical view

CVE-2021-25316 is a CWE-377 insecure temporary file issue involving static temporary files in detach_disks.sh. It affects SUSE Linux Enterprise Server 12-SP5 and 15-SP2 s390-tools below the fixed package versions. CVSS 3.1 is 3.3, local attack vector, low availability impact only.

Likely exposure

Exposure is likely limited to SUSE Linux Enterprise Server 12-SP5 or 15-SP2 systems using affected s390-tools packages, especially environments relying on VM live migration on s390 platforms.

Exploitation context

The record supports local, low-privilege exploitation only. It is not listed in KEV, and the supplied sources do not report active exploitation or public weaponization.

Researcher notes

The scope is SUSE-packaged s390-tools on SLES 12-SP5 and 15-SP2. The CVSS vector shows local access, no user interaction, unchanged scope, and no confidentiality or integrity impact. Evidence does not establish broader upstream or cross-distribution exposure.

Mitigation direction

  • Update SLES 12-SP5 s390-tools to 2.1.0-18.29.1 or later.
  • Update SLES 15-SP2 s390-tools to 2.11.0-9.20.1 or later.
  • Check SUSE guidance for the applicable maintenance channel and package advisory.
  • Prioritize hosts where live migration supports uptime, maintenance, or failover workflows.

Validation and detection

  • Inventory SLES 12-SP5 and 15-SP2 systems on s390 platforms.
  • Confirm installed s390-tools package versions against the fixed versions.
  • Identify systems where VM live migration is enabled or operationally important.
  • Review vendor advisory status if package availability differs by subscription channel.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-377: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-25316 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Low
CVSS
3.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
3.3CVSS 3.1LowCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L1.81.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

3.3Low
CVSS 3.1 vector shape for CVE-2021-25316Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
SUSESUSE Linux Enterprise Server 12-SP5s390-toolsListed
SUSESUSE Linux Enterprise Server 15-SP2s390-toolsListed
Weakness

CWE details

CWE-377

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-377 · source CWE mapping

Insecure Temporary File

Insecure Temporary File represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs