CVE-2026-74449

Local system crash via zero-area viewport

Published Aug 15, 2026 · Updated Aug 15, 2026

Divide-by-zero in Linux before 7.1.8 allows local users to crash the system by submitting a zero-area AMD display viewport. The calculate_mcache_setting function continues after calculate_mcache_row_bytes leaves num_mcaches and viewport dimensions at zero, then divides by those values and can underflow the cache count. The path requires local control of an AMD display plane configuration; successful triggering panics the kernel and interrupts the host.

CVSS severity7.8
High
EPSS probability0.12%
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 before 7.1.8 allows local users to crash the system by submitting a zero-area AMD display viewport. The calculate_mcache_setting function continues after calculate_mcache_row_bytes leaves num_mcaches and viewport dimensions at zero, then divides by those values and can underflow the cache count. The path requires local control of an AMD display plane configuration; successful triggering panics the kernel and interrupts the host.

The record

CVE
CVE-2026-74449
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-369, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=0 <7.1.8
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1f93537881fd22712732a60ad12572a3fd40c0ec
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f327e389c07cfc3a2f6ff54f6214e1a52d457edc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0 <7.1.8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1f93537881fd22712732a60ad12572a3fd40c0ec; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f327e389c07cfc3a2f6ff54f6214e1a52d457edc

Published CVSS scores

7.8LinuxCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
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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