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CVE Record

CVE-2025-21847: ASoC: SOF: stream-ipc: Check for cstream nullity in sof_ipc_msg_data()

In the Linux kernel, the following vulnerability has been resolved: ASoC: SOF: stream-ipc: Check for cstream nullity in sof_ipc_msg_data() The nullity of sps->cstream should be checked similarly as it is done in sof_set_stream_data_offset() function. Assuming that it is not NULL if sps->stream is NULL is incorrect and can lead to NULL pointer dereference.

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2025-21847 is a Linux kernel availability flaw in the Sound Open Firmware audio path. A local low-privileged user could trigger a NULL pointer dereference, potentially causing a system crash. The CVE record does not show active exploitation or remote attack capability.

Executive priority

Treat as routine-to-priority patching for Linux endpoints or shared systems, not an emergency internet-exposed issue. Escalate where a crash could disrupt critical workloads or where many untrusted local users share the same host.

Technical view

The issue is CWE-476 in ASoC SOF stream IPC. sof_ipc_msg_data() failed to check sps->cstream for NULL, incorrectly assuming it was valid when sps->stream was NULL. The CVSS vector is local, low complexity, low privilege, no user interaction, with high availability impact only.

Likely exposure

Exposure is most relevant to Linux systems running affected kernel versions with the ASoC SOF audio code present. The bundle does not identify downstream distro package names, cloud images, appliances, or specific hardware models.

Exploitation context

The source bundle says KEV is false and provides no cited evidence of active exploitation. The CVSS vector indicates local authenticated access is required. This is mainly a denial-of-service concern, not a confidentiality or integrity issue based on the provided scoring.

Researcher notes

The strongest evidence is the CVE record and Linux stable commit references. Affected range details in the bundle are limited and should be reconciled with vendor advisories. Do not infer exploit availability, affected distributions, or mitigations beyond the provided sources.

Mitigation direction

  • Update to a vendor kernel containing the listed stable fixes.
  • Check distribution advisories for backported fixes before relying on version numbers alone.
  • Prioritize shared or multi-user Linux systems where local users are untrusted.
  • If no patch is available, follow vendor guidance; no workaround is named in the sources.

Validation and detection

  • Inventory Linux kernel versions across affected assets.
  • Confirm whether the vendor kernel includes one of the referenced stable fixes or a backport.
  • Identify systems using ASoC SOF audio functionality or related kernel modules.
  • Review whether local untrusted users can access affected systems.
Prepared
Confidence
high
Sources
7

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-476: 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.

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cve · low confidence lookup

CVE-2025-21847 mapping review

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

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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
1ADP providers
6Source 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-2025-21847Attack 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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxe46f81541b1bf5db45a8c7a9cbc35ffc696877dc, 090349a9feba3ceee3997d31d68ffe54e5b57acb, 090349a9feba3ceee3997d31d68ffe54e5b57acb, 090349a9feba3ceee3997d31d68ffe54e5b57acb, 090349a9feba3ceee3997d31d68ffe54e5b57acbunaffected
LinuxLinux6.3, 0, 6.6.80, 6.12.17, 6.13.5, 6.14affected
Weakness

CWE details

CWE-476

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