CVE-2026-40399

7.8 HIGH

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an authorized attack...

Published: 2026-05-12 · Last updated: 2026-06-01

Severity and scoring

CVSS: 7.8 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-121

Affected products

Vendor	Product
microsoft	windows_10_1607, windows_10_1809, windows_10_21h2

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-40399
[Vendor advisory]https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40399

Related CVEs

Same vendor

CVE-2026-50512 — Improper link resolution before file access ('link following') in Microsoft PC Manager allows an authorized attacker to elevate privilege... (7.8 HIGH)
CVE-2026-50511 — Improper link resolution before file access ('link following') in Microsoft PC Manager allows an authorized attacker to elevate privilege... (7.8 HIGH)
CVE-2026-50507 — Protection mechanism failure in Windows BitLocker allows an unauthorized attacker to bypass a security feature with a physical attack (6.8 MEDIUM)
CVE-2026-49161 — Improper access control in Microsoft PC Manager allows an authorized attacker to bypass a security feature locally (7.8 HIGH)
CVE-2026-49160 — Uncontrolled resource consumption in HTTP/2 allows an unauthorized attacker to deny service over a network (7.5 HIGH)

Same CWE

CVE-2026-10829 — A stack-based buffer overflow vulnerability has been found in the NPort W2150A-W4/W2250A-W4 Series version 1.5 and earlier
CVE-2026-7273 — A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0 could allo... (8.8 HIGH)
CVE-2025-55660 — A stack overflow in the gf_opus_read_length function (media_tools/av_parsers.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of... (5.5 MEDIUM)
CVE-2026-8356 — LibreOffice can import presentations in the legacy binary PPT format
CVE-2026-12222 — A vulnerability was determined in Yealink SIP-T46U 108.86.0.118 (8.0 HIGH)