High

Samsung KNOX Kernel UAF Exposes Millions of Galaxy Devices

Security Affairs

June 23, 2026 at 11:00 PM

Overview

Samsung has patched a serious vulnerability in its KNOX security software that affects millions of Galaxy devices. The flaw, identified as CVE-2026-20971, is a use-after-free vulnerability located in the kernel, specifically within the PROCA/FIVE component. This issue could allow attackers to exploit the software designed to protect devices, raising significant security concerns for users. Samsung released a fix for this flaw in January 2026, but the potential for exploitation underscores the need for users to update their devices promptly. The vulnerability puts millions of Galaxy users at risk, highlighting the importance of maintaining security updates for mobile devices.

Key Takeaways

Affected Systems: Samsung Galaxy devices using KNOX security software, specifically the PROCA/FIVE component.
Action Required: Samsung released a patch in January 2026 to fix the CVE-2026-20971 vulnerability.
Timeline: Disclosed in January 2026

Original Article Summary

Samsung’s KNOX flaw (CVE-2026-20971) is a kernel UAF in PROCA/FIVE that can enable corruption via a race; Samsung patched it in Jan 2026. Experts found a nasty kernel flaw in Samsung’s KNOX stack, and the uncomfortable part is where it lived: inside the software designed to raise the bar for attackers. CVE-2026-20971 is a use-after-free […]

Impact

Samsung Galaxy devices using KNOX security software, specifically the PROCA/FIVE component.

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Disclosed in January 2026

Remediation

Samsung released a patch in January 2026 to fix the CVE-2026-20971 vulnerability. Users are advised to update their devices to the latest software version to ensure they are protected.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Exploit, Vulnerability, and 1 more.

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