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CVE Record

CVE-2025-40154: ASoC: Intel: bytcr_rt5640: Fix invalid quirk input mapping

In the Linux kernel, the following vulnerability has been resolved: ASoC: Intel: bytcr_rt5640: Fix invalid quirk input mapping When an invalid value is passed via quirk option, currently bytcr_rt5640 driver only shows an error message but leaves as is. This may lead to unepxected results like OOB access. This patch corrects the input mapping to the certain default value if an invalid value is passed.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue affects an Intel audio driver. If an invalid driver quirk option is supplied, the driver may keep using the bad value, potentially causing out-of-bounds access. The source does not provide CVSS, CWE, impact details, or evidence of exploitation.

Executive priority

Handle through normal kernel patch management unless asset inventory shows broad use of this Intel audio driver in managed endpoints. There is no sourced evidence of active exploitation or severe business impact.

Technical view

CVE-2025-40154 is in the Linux ASoC Intel bytcr_rt5640 driver. The bug is improper handling of invalid quirk input mapping: the driver logs an error but does not reset to a safe default, which may produce unexpected behavior including OOB access. Stable kernel commits correct invalid input mapping to a default value.

Likely exposure

Exposure appears limited to Linux systems using the Intel bytcr_rt5640 ASoC audio driver and accepting or configuring the affected quirk option. The supplied source bundle does not establish remote exposure, privilege requirements, or distribution-specific package status.

Exploitation context

The source bundle states possible out-of-bounds access but gives no exploitability details. KEV is false, and no cited source reports active exploitation. Treat exploitation status as unconfirmed.

Researcher notes

The record lacks CVSS, CWE, and detailed affected range semantics in the provided bundle. The key behavior is invalid quirk input not being normalized, with possible OOB access. Validate against upstream stable commits and downstream vendor backports.

Mitigation direction

  • Check vendor or distribution kernel advisories for fixed packages containing the referenced stable commits.
  • Prioritize kernel updates on systems using the bytcr_rt5640 audio driver.
  • Avoid nonstandard or invalid bytcr_rt5640 quirk option values where operationally possible.
  • Track Linux stable kernel updates for the branches listed in the CVE record.

Validation and detection

  • Inventory Linux kernel versions and identify systems with the bytcr_rt5640 driver present or loaded.
  • Review boot parameters and module options for bytcr_rt5640 quirk configuration.
  • Compare installed kernel source or package changelog against the referenced stable commits.
  • Confirm distribution advisories before marking a host remediated.
Prepared
Confidence
medium
Sources
10

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-2025-40154 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
3Timeline events
1ADP providers
9Source links

SSVC decision data

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

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
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux063422ca2a9de238401c3848c1b3641c07b6316c, 063422ca2a9de238401c3848c1b3641c07b6316c, 063422ca2a9de238401c3848c1b3641c07b6316c, 063422ca2a9de238401c3848c1b3641c07b6316c, 063422ca2a9de238401c3848c1b3641c07b6316c, 063422ca2a9de238401c3848c1b3641c07b6316c, 063422ca2a9de238401c3848c1b3641c07b6316c, 063422ca2a9de238401c3848c1b3641c07b6316cunaffected
LinuxLinux4.18, 0, 5.4.301, 5.10.246, 5.15.195, 6.1.156, 6.6.112, 6.12.53, 6.17.3, 6.18affected
Weakness

CWE details

No CWE listed

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