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CVE-2026-62840 Microsoft CVE debrief

A time-of-check time-of-use (toctou) race condition in the Linux Kernel allows an authorized attacker to elevate privileges locally. This vulnerability is rated as HIGH with a CVSS score of 7. The CVE record was published on 2026-10-13T20:37:15.976Z and was last modified on 2026-10-14T17:57:15.225Z. The vulnerability affects Linux 3P (Third Party) Distros and Linux kernel - Microsoft MANA Network Driver. Defenders should assess exposure and prioritize patching. Verification of patch application is required to prevent local privilege elevation. Monitoring for local privilege elevation attempts is necessary.

Vendor
Microsoft
Product
Linux 3P (Third Party) Distros
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-14
Advisory published
2026-10-13
Advisory updated
2026-10-14

Who should care

Defenders responsible for Linux Kernel deployments, particularly those using Linux 3P (Third Party) Distros and Linux kernel - Microsoft MANA Network Driver, should assess exposure and prioritize patching.

Why it matters

CVE-2026-62840 is a HIGH-rated vulnerability in the Linux Kernel that allows an authorized attacker to elevate privileges locally. Defenders should prioritize verifying and applying patches, assessing exposure, and monitoring for potential attacks.

  • Verification of patch application is required to prevent local privilege elevation.
  • Defenders must assess exposure in Linux 3P (Third Party) Distros and Linux kernel - Microsoft MANA Network Driver deployments.
  • Monitoring for local privilege elevation attempts is necessary.

Technical summary

The Linux Kernel Elevation of Privilege Vulnerability occurs due to a time-of-check time-of-use (toctou) race condition, allowing an authorized attacker to elevate privileges locally. The vulnerability affects Linux 3P (Third Party) Distros and Linux kernel - Microsoft MANA Network Driver.

Defensive priority

Defenders should prioritize verifying and applying patches for Linux Kernel versions less than 7.3, assessing exposure in Linux 3P (Third Party) Distros and Linux kernel - Microsoft MANA Network Driver deployments.

Recommended defensive actions

  • Verify and apply patches for Linux Kernel versions less than 7.3
  • Assess exposure in Linux 3P (Third Party) Distros and Linux kernel - Microsoft MANA Network Driver deployments
  • Monitor for local privilege elevation attempts

Evidence notes

The CVE Program record and NVD vulnerability detail provide official information on the vulnerability. The source item from cve_program_cvelist_v5 offers additional context. A vendor advisory and patch are available from Microsoft.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-62840 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-62840

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-62840 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-62840

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Linux Kernel Elevation of Privilege Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/62xxx/CVE-2026-62840.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62840

    Supplemental source - vendor-advisory, patch

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.