Microsoft Windows 11 26H1 vulnerabilities

CVE-2026-50449 [HIGH] CWE-416 CVE-2026-50449: Use after free in Windows Runtime allows an authorized attacker to elevate privileges locally. Use after free in Windows Runtime allows an authorized attacker to elevate privileges locally.

CVE-2026-50322 [HIGH] CWE-362 CVE-2026-50322: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Runtime allows an authorized attacker to elevate privileges locally.

CVE-2026-50503 [HIGH] CWE-362 CVE-2026-50503: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Runtime allows an authorized attacker to elevate privileges locally.

CVE-2026-50345 [HIGH] CWE-362 CVE-2026-50345: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Runtime allows an authorized attacker to elevate privileges locally.

CVE-2026-50371 [HIGH] CWE-362 CVE-2026-50371: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows LUAFV allows an authorized attacker to elevate privileges locally.

CVE-2026-45601 [HIGH] CWE-362 CVE-2026-45601: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-45596 [HIGH] CWE-362 CVE-2026-45596: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to ele Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-45598 [HIGH] CWE-362 CVE-2026-45598: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-45603 [HIGH] CWE-362 CVE-2026-45603: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-26173 [HIGH] CWE-362 CVE-2026-26173: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-50672 [HIGH] CWE-362 CVE-2026-50672: Use after free in Windows NTFS allows an authorized attacker to elevate privileges locally. Use after free in Windows NTFS allows an authorized attacker to elevate privileges locally.

CVE-2026-56168 [MEDIUM] CWE-476 CVE-2026-56168: Null pointer dereference in Windows SMB Server allows an authorized attacker to deny service over a Null pointer dereference in Windows SMB Server allows an authorized attacker to deny service over a network.

CVE-2026-50366 [MEDIUM] CWE-476 CVE-2026-50366: Null pointer dereference in Active Directory Domain Services allows an authorized attacker to deny s Null pointer dereference in Active Directory Domain Services allows an authorized attacker to deny service over a network.

CVE-2026-57976 [MEDIUM] CWE-476 CVE-2026-57976: Null pointer dereference in Active Directory Domain Services allows an authorized attacker to deny s Null pointer dereference in Active Directory Domain Services allows an authorized attacker to deny service over a network.

CVE-2026-55003 [MEDIUM] CWE-908 CVE-2026-55003: Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information over a network.

CVE-2026-58546 [MEDIUM] CWE-908 CVE-2026-58546: Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information over a network.

CVE-2026-50354 [HIGH] CWE-416 CVE-2026-50354: Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally. Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.

CVE-2026-50372 [HIGH] CWE-122 CVE-2026-50372: Buffer over-read in Windows Redirected Drive Buffering allows an authorized attacker to elevate priv Buffer over-read in Windows Redirected Drive Buffering allows an authorized attacker to elevate privileges locally.

CVE-2026-32224 [HIGH] CWE-416 CVE-2026-32224: Use after free in Windows Server Update Service allows an authorized attacker to elevate privileges Use after free in Windows Server Update Service allows an authorized attacker to elevate privileges locally.

CVE-2026-26166 [HIGH] CWE-415 CVE-2026-26166: Double free in Windows Shell allows an authorized attacker to elevate privileges locally. Double free in Windows Shell allows an authorized attacker to elevate privileges locally.