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CVE-2026-45638Patch(microsoft / windows_10_1607)

LOWCVSS 7.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch microsoft windows_10_1607 systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

microsoft CVEsBack to dashboard
1.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-122

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • windows_10_1607
  • windows_10_1809
  • windows_10_21h2
  • windows_10_22h2

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • General: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-06-09); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
microsoft
Products
windows_10_1607windows_10_1809windows_10_21h2windows_10_22h2windows_11_23h2windows_11_24h2windows_11_25h2windows_11_26h1windows_server_2012windows_server_2016

2 versions affected across 13 products

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-06-09: 1Mentions · 2026-06-10: 1Patch / Workaround · 2026-06-09: 1Technical Details · 2026-06-09: 106-0906-10
Signal classification2 categories
Patch
150.0%
General
150.0%
Referenced assets7 URLs
Classification over time
DateTotalLabels
2026-06-091
Patch1
2026-06-101
General1
Full discourse2 posts
  • Thanatos Tian@HototogisuTian
    General

    CVE-2026-40409: https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-40409 CVE-2026-42968: https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-42968 CVE-2026-42974: https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-42974 CVE-2026-42981: https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-42981 CVE-2026-44811: https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-44811 CVE-2026-45638: https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-45638

    Post summary

    The passage simply lists several CVE identifiers with links to Microsoft advisory pages, providing no additional technical or exploit information.

    0000071
    25 followersView on X
  • WindowsForum@windowsforum
    Patch

    🪟 Local WinSock driver EoP (CVE-2026-45638): not a sexy RCE, but it’s the part where attackers “level up” after getting in. Patch Tuesday: closing the door that keeps being kicked. #Windows #Microsoft #Security https://windowsforum.com/threads/cve-2026-45638-windows-winsock-driver-local-privilege-escalation-patch-tuesday.424606/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #WindowsSecurity #PatchTuesday https://t.co/15VmgKkgZY

    Post summary

    The post announces that Microsoft has released a Patch Tuesday update for CVE‑2026‑45638, which is a local privilege escalation vulnerability in the WinSock driver.

    0000057
    1.2K followersView on X
CPE platform detail24 entries

24 of 24 entries

PartVendorProductVersionTarget SWTarget HW
OSmicrosoftwindows_10_1607--x64
OSmicrosoftwindows_10_1607--x86
OSmicrosoftwindows_10_1809--x64
OSmicrosoftwindows_10_1809--x86
OSmicrosoftwindows_10_21h2--arm64
OSmicrosoftwindows_10_21h2--x64
OSmicrosoftwindows_10_21h2--x86
OSmicrosoftwindows_10_22h2--arm64
OSmicrosoftwindows_10_22h2--x64
OSmicrosoftwindows_10_22h2--x86
OSmicrosoftwindows_11_23h2--arm64
OSmicrosoftwindows_11_23h2--x64
OSmicrosoftwindows_11_24h2--arm64
OSmicrosoftwindows_11_24h2--x64
OSmicrosoftwindows_11_25h2--arm64
OSmicrosoftwindows_11_25h2--x64
OSmicrosoftwindows_11_26h1--arm64
OSmicrosoftwindows_11_26h1--x64
OSmicrosoftwindows_server_2012---
OSmicrosoftwindows_server_2012r2--
OSmicrosoftwindows_server_2016---
OSmicrosoftwindows_server_2019---
OSmicrosoftwindows_server_2022---
OSmicrosoftwindows_server_2025--x64

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