CVE-2026-74600

Local kernel panic via zero-mapping counter overflow

Published Aug 22, 2026 · Updated Aug 22, 2026

Integer overflow in Linux 5.17 through 7.1.8 allows local users to crash the kernel by creating numerous zero-page mappings. The page_table_check_set() and page_table_check_clear() paths misclassify shared zero-page PTEs and huge zero PMDs as file-backed mappings, allowing file_map_count to overflow and reach BUG_ON(). Any unprivileged local process can reach the affected accounting paths; exploitation triggers a kernel panic and system-wide service interruption.

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

Integer overflow in Linux 5.17 through 7.1.8 allows local users to crash the kernel by creating numerous zero-page mappings. The page_table_check_set() and page_table_check_clear() paths misclassify shared zero-page PTEs and huge zero PMDs as file-backed mappings, allowing file_map_count to overflow and reach BUG_ON(). Any unprivileged local process can reach the affected accounting paths; exploitation triggers a kernel panic and system-wide service interruption.

The record

CVE
CVE-2026-74600
Published
Aug 22, 2026
Updated
Aug 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, 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=5.17
  2. Affected versionversion=df4e817b710809425d899340dbfa8504a3ca4ba5 <8db4bab826ccc9ec10fa41736a48031cd338d392
  3. Affected versionversion=df4e817b710809425d899340dbfa8504a3ca4ba5 <b726eb3c94d23e09da0e0f46b0fa09fb2b5d99cc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.17; version=df4e817b710809425d899340dbfa8504a3ca4ba5 <8db4bab826ccc9ec10fa41736a48031cd338d392; version=df4e817b710809425d899340dbfa8504a3ca4ba5 <b726eb3c94d23e09da0e0f46b0fa09fb2b5d99cc

Published CVSS scores

5.5Red HatCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-190Integer Overflow or Wraparound
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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