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CVE-2026-23668 is a high-severity privilege escalation vulnerability residing in the Microsoft Windows Graphics Component. The flaw is a classic race condition (CWE-362), which occurs when multiple processes or threads access a shared resource concurrently without proper synchronization. In this specific case, the Graphics Component fails to correctly manage concurrent operations on shared memory or system resources. This creates a small timing window—a “race”—that an authorized local attacker can exploit. By winning this race, the attacker can manipulate the shared resource’s state after it has been checked but before it is used (a Time-of-Check to Time-of-Use, or TOCTOU, scenario). This allows the attacker to alter the execution flow of a privileged process. Successful exploitation enables the attacker, who already has limited local access and low privileges, to execute arbitrary code with elevated privileges, potentially gaining SYSTEM-level control over the affected machine. The vulnerability was reported to the ZDI program by Marcin Wiązowski and was patched by Microsoft during the March 2026 Patch Tuesday .
dailycve form:
Platform: Microsoft Windows
Version: Various Versions
Vulnerability : Race Condition
Severity: HIGH
date: 2026-03-10
Prediction: March 10 2026
What Undercode Say:
Analytics
- CVE ID: CVE-2026-23668
- CVSS Score: 7.0 (HIGH)
- Attack Vector: Local
- Complexity: High
- Privileges Required: Low
- User Interaction: None
- Scope: Unchanged
- CWE: 362 (Concurrent Execution using Shared Resource with Improper Synchronization)
Bash/Code
Check if the March 2026 Patch Tuesday updates are installed
Look for KB numbers released on or after March 10, 2026
wmic qfe list brief /format:texttable | findstr /i "2026-03-10"
PowerShell command to check installed patches
Get-HotFix | Where-Object { $_.InstalledOn -ge "2026-03-10" } | Format-Table HotFixID, InstalledOn
Example of a simple race condition concept (for educational purposes)
This is NOT an exploit for this specific CVE but illustrates the flaw.
cat > race_condition_example.c << 'EOF'
include <stdio.h>
include <pthread.h>
include <unistd.h>
int shared_resource = 0;
void winner(void arg) {
// This thread tries to modify the resource after the check
usleep(100); // Simulate winning the race by a tiny delay
shared_resource = 999;
printf("Winner changed resource to: %d\n", shared_resource);
return NULL;
}
void checker(void arg) {
// This thread checks the resource and then uses it
if (shared_resource == 0) {
printf("Checker: Resource is 0, proceeding to use it...\n");
usleep(200); // Simulate time gap between check and use
// In a vulnerable app, it would use 'shared_resource' here, assuming it's still 0
if (shared_resource != 0) {
printf("Checker: RACE CONDITION! Resource is now %d\n", shared_resource);
}
}
return NULL;
}
int main() {
pthread_t t1, t2;
pthread_create(&t1, NULL, checker, NULL);
pthread_create(&t2, NULL, winner, NULL);
pthread_join(t1, NULL);
pthread_join(t2, NULL);
return 0;
}
EOF
gcc -o race_example race_condition_example.c -lpthread
./race_example
Exploit
- No public exploit is available at the time of writing .
- The vulnerability was submitted to the ZDI program as two separate bugs, suggesting a complex race condition .
- A local authenticated user would need to trigger a specific sequence of graphics operations to win the race.
- Successful exploitation leads to privilege escalation to SYSTEM, giving the attacker full control over the system .
Protection from this CVE
- Apply the Microsoft security updates released on March 10, 2026, immediately .
- Restrict local access to systems to only trusted and authorized users.
- Implement the principle of least privilege to minimize the impact of a successful local compromise.
- Enable and configure Windows Defender Exploit Guard features, such as Controlled Folder Access and Attack Surface Reduction rules, to hinder post-exploitation activity.
Impact
- An authorized attacker with low privileges can elevate their access to SYSTEM.
- This allows a complete compromise of the confidentiality, integrity, and availability of the affected system .
- The attacker could install programs; view, change, or delete data; or create new accounts with full user rights.
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Sources:
Reported By: nvd.nist.gov
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