CVE-2026-31605

Local system crash via zero framebuffer pixclock

Published Apr 24, 2026 · Updated Apr 24, 2026

Divide-by-zero in the Linux Kernel udlfb driver allows local users to crash the system by submitting a zero pixclock through FBIOPUT_VSCREENINFO. The dlfb_ops_check_var function uses the caller-controlled pixclock directly as a divisor without first rejecting zero. A local user with access to the udlfb framebuffer device can trigger a kernel crash, causing a service interruption.

CVSS severity5.5
Medium
EPSS probability0.13%
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 Linux Kernel udlfb driver allows local users to crash the system by submitting a zero pixclock through FBIOPUT_VSCREENINFO. The dlfb_ops_check_var function uses the caller-controlled pixclock directly as a divisor without first rejecting zero. A local user with access to the udlfb framebuffer device can trigger a kernel crash, causing a service interruption.

The record

CVE
CVE-2026-31605
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-369, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <03797cdee38ef19c87785622d423aabaafb71c5f
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6de048d78f3029744778b7a2891745f3ca7c209a
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <afaaaa38579f1252bb42b145f6e88a955c4f73f3
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cccbf9b7fdab48ce4feb69c24f7f928aa8e4e8b8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <03797cdee38ef19c87785622d423aabaafb71c5f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6de048d78f3029744778b7a2891745f3ca7c209a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <afaaaa38579f1252bb42b145f6e88a955c4f73f3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cccbf9b7fdab48ce4feb69c24f7f928aa8e4e8b8

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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