CVE-2025-39916

Service interruption via zero aggregation interval

Published Oct 1, 2025 · Updated May 23, 2026

Divide by zero in Linux kernel DAMON_RECLAIM allows local users to interrupt service by applying crafted module parameters. damon_reclaim_apply_parameters() calculates min_age_region by dividing min_age by an unchecked aggr_interval value, so zero triggers a kernel divide exception. Reachability requires CONFIG_DAMON_RECLAIM and permission to change its module parameters; published evidence limits the consequence to the divide error.

CVSS severity5.5
Medium
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

Divide by zero in Linux kernel DAMON_RECLAIM allows local users to interrupt service by applying crafted module parameters. damon_reclaim_apply_parameters() calculates min_age_region by dividing min_age by an unchecked aggr_interval value, so zero triggers a kernel divide exception. Reachability requires CONFIG_DAMON_RECLAIM and permission to change its module parameters; published evidence limits the consequence to the divide error.

The record

CVE
CVE-2025-39916
Published
Oct 1, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-369, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=6.0.12 <6.1
  2. Affected versionversion=6.1
  3. Affected versionversion=f5a79d7c0c87c8d88bb5e3f3c898258fdf1b3b05 <40cb9b38b645126fdd1d6aa3d6811a8ad50ddfa1
  4. Affected versionversion=f5a79d7c0c87c8d88bb5e3f3c898258fdf1b3b05 <5d6eeb3c683c777ed4538eb3a650bb7da17a7cff
  5. Affected versionversion=f5a79d7c0c87c8d88bb5e3f3c898258fdf1b3b05 <64dc351e58271c1e9005e42f5216b4f3d7a39b66
  6. Affected versionversion=f5a79d7c0c87c8d88bb5e3f3c898258fdf1b3b05 <9fe0415156fbde773b31f920201cb70b1f0e40fe
  7. Affected versionversion=f5a79d7c0c87c8d88bb5e3f3c898258fdf1b3b05 <e6b543ca9806d7bced863f43020e016ee996c057
  8. Affected versionversion=fd3e613a912bbb344ee18579cc2ad3329aacba41

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0.12 <6.1; version=6.1; version=f5a79d7c0c87c8d88bb5e3f3c898258fdf1b3b05 <40cb9b38b645126fdd1d6aa3d6811a8ad50ddfa1; version=f5a79d7c0c87c8d88bb5e3f3c898258fdf1b3b05 <5d6eeb3c683c777ed4538eb3a650bb7da17a7cff; version=f5a79d7c0c87c8d88bb5e3f3c898258fdf1b3b05 <64dc351e58271c1e9005e42f5216b4f3d7a39b66; version=f5a79d7c0c87c8d88bb5e3f3c898258fdf1b3b05 <9fe0415156fbde773b31f920201cb70b1f0e40fe; version=f5a79d7c0c87c8d88bb5e3f3c898258fdf1b3b05 <e6b543ca9806d7bced863f43020e016ee996c057; version=fd3e613a912bbb344ee18579cc2ad3329aacba41

Published CVSS scores

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
T1499.004Application or System Exploitation

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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