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CVE Record

CVE-2024-27054: s390/dasd: fix double module refcount decrement

In the Linux kernel, the following vulnerability has been resolved: s390/dasd: fix double module refcount decrement Once the discipline is associated with the device, deleting the device takes care of decrementing the module's refcount. Doing it manually on this error path causes refcount to artificially decrease on each error while it should just stay the same.

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel issue in the s390 DASD storage driver. A local user could trigger an error path that incorrectly decreases a module reference count, potentially causing a denial of service. The CVSS score is 5.5, with availability impact only. No source provided indicates active exploitation.

Executive priority

Treat as a routine but real availability risk for s390 Linux environments. It is not remotely exploitable based on provided data, but shared or multi-user mainframe Linux systems should receive normal kernel patch priority.

Technical view

CVE-2024-27054 fixes a double module refcount decrement in s390/dasd. After a discipline is associated with a device, device deletion already decrements the module refcount. A manual decrement on an error path can reduce the refcount incorrectly. CVSS is AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Likely exposure

Exposure is mainly Linux systems on s390/IBM Z using the DASD subsystem. The attack vector is local and requires low privileges. Systems not running the affected s390 DASD code path are less likely to be exposed, but the provided source data does not fully clarify distribution-specific affected packages.

Exploitation context

The CVE record indicates local, low-complexity exploitation with no user interaction and high availability impact. It does not indicate confidentiality or integrity impact. KEV is false in the provided data, and no cited source states active exploitation.

Researcher notes

The source data names Linux kernel s390/dasd and provides stable commit references, but affected-version formatting is incomplete for precise distro mapping. No CWE is listed. Validate against upstream commits and downstream vendor kernels rather than relying only on generic version numbers.

Mitigation direction

  • Apply Linux kernel updates from your distribution that include the s390/dasd refcount fix.
  • For custom kernels, review and backport the referenced stable kernel commits.
  • Prioritize affected s390 systems where local users or workloads are not fully trusted.
  • Check vendor advisories for exact package names and fixed build numbers.

Validation and detection

  • Inventory Linux systems running on s390/IBM Z architecture.
  • Identify systems using the DASD storage driver or related modules.
  • Check kernel package changelogs for CVE-2024-27054 or the referenced commits.
  • Confirm running kernels include the relevant stable fix.
  • Monitor vendor security advisories for distribution-specific affected and fixed versions.
Prepared
Confidence
medium
Sources
9

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

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CVE-2024-27054 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (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:H

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
3Timeline events
2ADP providers
8Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

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
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2024-27054Attack 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:H

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

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxc020d722b110a44c613ef71e657e6dd4116e09d9, c020d722b110a44c613ef71e657e6dd4116e09d9, c020d722b110a44c613ef71e657e6dd4116e09d9, c020d722b110a44c613ef71e657e6dd4116e09d9, c020d722b110a44c613ef71e657e6dd4116e09d9, c020d722b110a44c613ef71e657e6dd4116e09d9, c020d722b110a44c613ef71e657e6dd4116e09d9unaffected
LinuxLinux4.9, 0, 5.10.237, 5.15.153, 6.1.83, 6.6.23, 6.7.11, 6.8.2, 6.9affected
Weakness

CWE details

No CWE listed

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