CVE-2026-74643

Local kernel crash via zero quota target

Published Aug 22, 2026 · Updated Aug 22, 2026

Division by zero in the Linux 6.17 kernel allows local users to crash the system by enabling DAMON_SAMPLE_MTIER with a zero quota target. The damos_quota_score() function divides by a user-configured target_value without rejecting zero values supplied through node0_mem_used_bp or node0_mem_free_bp. Reaching the fault requires local access to configure and enable the sample module; the resulting kernel oops interrupts the system.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Division by zero in the Linux 6.17 kernel allows local users to crash the system by enabling DAMON_SAMPLE_MTIER with a zero quota target. The damos_quota_score() function divides by a user-configured target_value without rejecting zero values supplied through node0_mem_used_bp or node0_mem_free_bp. Reaching the fault requires local access to configure and enable the sample module; the resulting kernel oops interrupts the system.

The record

CVE
CVE-2026-74643
Published
Aug 22, 2026
Updated
Aug 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-369, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 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=6.17
  2. Affected versionversion=c5e67d40a10234541e220750297304df79aaedd0 <684f271210becd7b8c4088f06c442499e48a43a0
  3. Affected versionversion=c5e67d40a10234541e220750297304df79aaedd0 <a16fd3ad9d89b05475864da97327870464611736
  4. Affected versionversion=c5e67d40a10234541e220750297304df79aaedd0 <e16b8d640ec99b28bc827560edcf9706e610c3aa

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.17; version=c5e67d40a10234541e220750297304df79aaedd0 <684f271210becd7b8c4088f06c442499e48a43a0; version=c5e67d40a10234541e220750297304df79aaedd0 <a16fd3ad9d89b05475864da97327870464611736; version=c5e67d40a10234541e220750297304df79aaedd0 <e16b8d640ec99b28bc827560edcf9706e610c3aa

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/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
T1499.004Endpoint Denial of Service: Application 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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