CVE-2025-40154

Out-of-bounds access via retained invalid quirk

Published Nov 12, 2025 · Updated Jun 16, 2026

Improper quirk validation in the Linux bytcr_rt5640 audio driver allows attackers to trigger out-of-bounds access. The log_quirks function reports an unsupported low-bit input map but leaves the global byt_rt5640_quirk value unchanged for later code to consume. Reachability requires control of the quirk module parameter during driver loading, normally administrative configuration, on systems using this Intel and Realtek audio path.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper quirk validation in the Linux bytcr_rt5640 audio driver allows attackers to trigger out-of-bounds access. The log_quirks function reports an unsupported low-bit input map but leaves the global byt_rt5640_quirk value unchanged for later code to consume. Reachability requires control of the quirk module parameter during driver loading, normally administrative configuration, on systems using this Intel and Realtek audio path.

The record

CVE
CVE-2025-40154
Published
Nov 12, 2025
Updated
Jun 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Nov 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=063422ca2a9de238401c3848c1b3641c07b6316c <29a41bf6422688f0c5a09b18222e1a64b2629fa4
  2. Affected versionversion=063422ca2a9de238401c3848c1b3641c07b6316c <2c27e047bdcba457ec953f7e90e4ed6d5f8aeb01
  3. Affected versionversion=063422ca2a9de238401c3848c1b3641c07b6316c <48880f3cdf2b6d8dcd91219c5b5c8a7526411322
  4. Affected versionversion=063422ca2a9de238401c3848c1b3641c07b6316c <5c03ea2ef4ebba75c69c90929d8590eb3d3797a9
  5. Affected versionversion=063422ca2a9de238401c3848c1b3641c07b6316c <a97b4d18ecb012c5624cdf2cab2ce5e1312fdd5d
  6. Affected versionversion=063422ca2a9de238401c3848c1b3641c07b6316c <dea9c8c9028c9374761224a7f9d824e845a2aa2e
  7. Affected versionversion=063422ca2a9de238401c3848c1b3641c07b6316c <f58fca15f3bf8b982e799c31e4afa8923788aa40
  8. Affected versionversion=063422ca2a9de238401c3848c1b3641c07b6316c <fba404e4b4af4f4f747bb0e41e9fff7d03c7bcc0
  9. Affected versionversion=4.18

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=063422ca2a9de238401c3848c1b3641c07b6316c <29a41bf6422688f0c5a09b18222e1a64b2629fa4; version=063422ca2a9de238401c3848c1b3641c07b6316c <2c27e047bdcba457ec953f7e90e4ed6d5f8aeb01; version=063422ca2a9de238401c3848c1b3641c07b6316c <48880f3cdf2b6d8dcd91219c5b5c8a7526411322; version=063422ca2a9de238401c3848c1b3641c07b6316c <5c03ea2ef4ebba75c69c90929d8590eb3d3797a9; version=063422ca2a9de238401c3848c1b3641c07b6316c <a97b4d18ecb012c5624cdf2cab2ce5e1312fdd5d; version=063422ca2a9de238401c3848c1b3641c07b6316c <dea9c8c9028c9374761224a7f9d824e845a2aa2e; version=063422ca2a9de238401c3848c1b3641c07b6316c <f58fca15f3bf8b982e799c31e4afa8923788aa40; version=063422ca2a9de238401c3848c1b3641c07b6316c <fba404e4b4af4f4f747bb0e41e9fff7d03c7bcc0; version=4.18

Published CVSS scores

No CVSS assessment is available in this record.

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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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