Low

Linux kernel ASoC Intel bytcr_rt5640 invalid quirk input mapping OOB access

IdentifiersCVE-2025-40154CWE-125

CVE-2025-40154 is a Linux kernel flaw in the ASoC Intel bytcr_rt5640 driver. The issue arises when an invalid value is supplied via a quirk option: the driver logs an error but leaves the invalid mapping in place instead of normalizing it to a safe value. According to the provided fix description, this can lead to unexpected behavior including possible out-of-bounds access. The remediation patch changes the driver behavior so that invalid quirk input mappings are corrected to a default safe value rather than being retained.

For your environment

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation may cause unexpected kernel behavior including possible out-of-bounds memory access in the affected driver. Because this occurs in kernel space, the impact can include system instability or denial of service, and potentially confidentiality, integrity, or availability impact depending on how the out-of-bounds condition is reached and what memory is affected. The provided content does not establish confirmed code execution.

Mitigation

If you can’t patch tonight, do this now.

No specific workaround is provided in the supplied content beyond patching. As a temporary risk-reduction measure, avoid using invalid or untrusted quirk option values for the affected bytcr_rt5640 driver and limit the ability of untrusted local administrators or privileged users to modify kernel/driver configuration until the fixed kernel is deployed.

Remediation

Patch, then assume compromise.

Apply a kernel update containing the fix for CVE-2025-40154. The fix changes the bytcr_rt5640 driver to replace invalid quirk input mappings with a safe default value. In the provided SUSE context, remediation is to install the vendor-supplied updated kernel packages for the affected product stream and reboot into the fixed kernel.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

LinuxLinux Kerneloperating_system

Rocky LinuxRocky Linuxoperating_system

Rocky LinuxRocky Linux 8 Kernel-Rtoperating_system

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

19 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

19 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

What this page doesn’t show

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity3