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Description

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

PUBLISHED Reserved 2026-04-30 | Published 2026-06-09 | Updated 2026-06-10 | Assigner microsoft




HIGH: 7.0CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Problem types

CWE-416: Use After Free

Product status

10.0.14393.0 (custom) before 10.0.14393.9234
affected

10.0.17763.0 (custom) before 10.0.17763.8880
affected

10.0.19044.0 (custom) before 10.0.19044.7417
affected

10.0.19045.0 (custom) before 10.0.19045.7417
affected

10.0.22631.0 (custom) before 10.0.22631.7219
affected

10.0.22631.0 (custom) before 10.0.22631.7219
affected

10.0.26100.0 (custom) before 10.0.26100.8655
affected

10.0.26200.0 (custom) before 10.0.26200.8655
affected

10.0.28000.0 (custom) before 10.0.28000.2269
affected

6.2.9200.0 (custom) before 6.2.9200.26132
affected

6.2.9200.0 (custom) before 6.2.9200.26132
affected

6.3.9600.0 (custom) before 6.3.9600.23228
affected

6.3.9600.0 (custom) before 6.3.9600.23228
affected

10.0.14393.0 (custom) before 10.0.14393.9234
affected

10.0.14393.0 (custom) before 10.0.14393.9234
affected

10.0.17763.0 (custom) before 10.0.17763.8880
affected

10.0.17763.0 (custom) before 10.0.17763.8880
affected

10.0.20348.0 (custom) before 10.0.20348.5256
affected

10.0.26100.0 (custom) before 10.0.26100.32995
affected

10.0.26100.0 (custom) before 10.0.26100.32995
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42911 (Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability) vendor-advisory patch

cve.org (CVE-2026-42911)

nvd.nist.gov (CVE-2026-42911)

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