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TI-2026-73650 Aliases CVE-2026-62840

Race condition in Linux kernel lets local users escalate privileges

Priority LOW 32CWE-367Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Microsoft Linux 3P (Third Party) Distros from 1.0.0 before 7.3 are affected. A time-of-check time-of-use race condition (CWE-367) in the Linux kernel lets an authorized local attacker escalate privileges.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Time-of-check time-of-use (toctou) race condition in Linux Kernel allows an authorized attacker to elevate privileges locally.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00207 10th percentileScored 2026-11-07
Fix Fixed Linux 3P (Third Party) Distros (Microsoft): 7.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftLinux 3P (Third Party) Distros1.0.0 to before 7.37.3Patch availableCNA
  • Linux 3P (Third Party) Distros VendorMicrosoft Affected 1.0.0 to before 7.3 Fixed in 7.3 Patch available CNA

Remediation

Microsoft lists version 7.3 as the fixed version for Linux 3P (Third Party) Distros. Update to version 7.3 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA Linux 3P (Third Party) Distros (Microsoft) Fixed in 7.3

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-62840
  2. 2026-10-16 Affected versions changed · CNA
  3. 2026-11-06 Affected versions changed · Red Hat
  4. 2026-11-06 CVSS score added · Red Hat

References

Patch 1

  • TI-2026-42212 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-37256 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-16982 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-36863 Windows Server Update Service (WSUS) Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-33671 Microsoft SharePoint Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
See all 18045 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences