CVE-2025-37850

Kernel crash via zero clock-rate divisor

Published May 9, 2025 · Updated May 11, 2026

Divide-by-zero in the MediaTek PWM driver in Linux allows local users to crash a specially configured kernel during PWM setup. pwm_mediatek_config() passes the zero returned by clk_get_rate() to do_div() without first rejecting the zero clock rate. Reachability requires CONFIG_COMPILE_TEST without CONFIG_HAVE_CLK, a theoretical combination because RALINK selects COMMON_CLK; the bounded consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide-by-zero in the MediaTek PWM driver in Linux allows local users to crash a specially configured kernel during PWM setup. pwm_mediatek_config() passes the zero returned by clk_get_rate() to do_div() without first rejecting the zero clock rate. Reachability requires CONFIG_COMPILE_TEST without CONFIG_HAVE_CLK, a theoretical combination because RALINK selects COMMON_CLK; the bounded consequence is a kernel crash.

The record

CVE
CVE-2025-37850
Published
May 9, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-369
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 9, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.12
  2. Affected versionversion=caf065f8fd583b43a3f95d84c8a0a0d07597963b <4cb15042b5f3ec0474e91cf379120cc597625dbb
  3. Affected versionversion=caf065f8fd583b43a3f95d84c8a0a0d07597963b <77fb96dbe350e8a5ae4965ff9f6e7049f3966a6b
  4. Affected versionversion=caf065f8fd583b43a3f95d84c8a0a0d07597963b <7ca59947b5fcf94e7ea4029d1bd0f7c41500a161
  5. Affected versionversion=caf065f8fd583b43a3f95d84c8a0a0d07597963b <8b9f60725d74b72c238e4437c957d0217746b506
  6. Affected versionversion=caf065f8fd583b43a3f95d84c8a0a0d07597963b <8ddbec73ea2598d8414e8f7103241b55cf877010
  7. Affected versionversion=caf065f8fd583b43a3f95d84c8a0a0d07597963b <c343856ff2689ce0afef823592732fc178ef4aac
  8. Affected versionversion=caf065f8fd583b43a3f95d84c8a0a0d07597963b <e1206d8e1651c9f62e5640b69b14d925b1a0a00a
  9. Affected versionversion=caf065f8fd583b43a3f95d84c8a0a0d07597963b <e3cf0c38d3ce754ad63005102fcfeb0b7ff3290b
  10. Affected versionversion=caf065f8fd583b43a3f95d84c8a0a0d07597963b <f3e9cf266c2c103cf071e15d7a17e2c699fff3c5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=caf065f8fd583b43a3f95d84c8a0a0d07597963b <4cb15042b5f3ec0474e91cf379120cc597625dbb; version=caf065f8fd583b43a3f95d84c8a0a0d07597963b <77fb96dbe350e8a5ae4965ff9f6e7049f3966a6b; version=caf065f8fd583b43a3f95d84c8a0a0d07597963b <7ca59947b5fcf94e7ea4029d1bd0f7c41500a161; version=caf065f8fd583b43a3f95d84c8a0a0d07597963b <8b9f60725d74b72c238e4437c957d0217746b506; version=caf065f8fd583b43a3f95d84c8a0a0d07597963b <8ddbec73ea2598d8414e8f7103241b55cf877010; version=caf065f8fd583b43a3f95d84c8a0a0d07597963b <c343856ff2689ce0afef823592732fc178ef4aac; version=caf065f8fd583b43a3f95d84c8a0a0d07597963b <e1206d8e1651c9f62e5640b69b14d925b1a0a00a; version=caf065f8fd583b43a3f95d84c8a0a0d07597963b <e3cf0c38d3ce754ad63005102fcfeb0b7ff3290b; version=caf065f8fd583b43a3f95d84c8a0a0d07597963b <f3e9cf266c2c103cf071e15d7a17e2c699fff3c5

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-369Divide By Zero

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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