CVE-2026-62840: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition in Microsoft Linux 3P (Third Party) Distros
Description
Time-of-check time-of-use (toctou) race condition in Linux Kernel allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.0high
Affected software
Microsoft
Linux 3P (Third Party) Distros
Microsoft
Linux kernel - Microsoft MANA Network Driver
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is a TOCTOU race condition (CWE-367) in the Linux Kernel component of Microsoft Linux third-party distributions. It enables a local attacker with authorized access to exploit a timing window between checking a condition and using a resource, resulting in privilege escalation. The CVSS v3.1 base score is 7.0, reflecting high impact on confidentiality, integrity, and availability. Microsoft has published an official fix for affected versions >=1.0.0 and <7.3.
Potential Impact
An authorized local attacker can exploit this race condition to elevate their privileges, potentially gaining higher-level access than intended. This can compromise system confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the vendor-provided patch as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62840 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-14T21:10:38.083Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62840","vendor":"Microsoft"}]
Threat ID: 6ace9d312cdf04f656af1d94
Added to database: 10/13/2026, 21:05:53 UTC
Last enriched: 10/13/2026, 21:19:18 UTC
Last updated: 10/13/2026, 23:48:17 UTC
Views: 3
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