CVE-2025-39935

Kernel memory corruption via undersized header allocation

Published Oct 4, 2025 · Updated Oct 4, 2025

Out-of-bounds write in the sma1307 ASoC codec driver in Linux 6.13 through 6.16.8 allows local users to corrupt kernel memory. sma1307_setting_loaded() allocates eight bytes for an eight-integer header, then memcpy() writes header_size multiplied by sizeof(int) bytes into that undersized buffer. Triggering the path requires CAP_SYS_ADMIN to rebind the driver through sysfs or occurs during boot-time probe, limiting exposure to privileged rebinds and kernel startup.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the sma1307 ASoC codec driver in Linux 6.13 through 6.16.8 allows local users to corrupt kernel memory. sma1307_setting_loaded() allocates eight bytes for an eight-integer header, then memcpy() writes header_size multiplied by sizeof(int) bytes into that undersized buffer. Triggering the path requires CAP_SYS_ADMIN to rebind the driver through sysfs or occurs during boot-time probe, limiting exposure to privileged rebinds and kernel startup.

The record

CVE
CVE-2025-39935
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 2025Record 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=576c57e6b4c1d734bcb7cc33dde9a99a9383b520 <78338108b5a856dc98223a335f147846a8a18c51
  2. Affected versionversion=576c57e6b4c1d734bcb7cc33dde9a99a9383b520 <cd59ca8f75dbb42a67fcae975c766114644e36c4
  3. Affected versionversion=6.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=576c57e6b4c1d734bcb7cc33dde9a99a9383b520 <78338108b5a856dc98223a335f147846a8a18c51; version=576c57e6b4c1d734bcb7cc33dde9a99a9383b520 <cd59ca8f75dbb42a67fcae975c766114644e36c4; version=6.13

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

CWE-787Out-of-bounds Write

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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