CVE-2026-20971Disclosure(samsung / android)

We published a technical write-up on CVE-2026-20971: a Samsung Android kernel use-after-free found by our team at LucidBit Labs. The interesting part: the bug lived inside a defense mechanism.

Samsung Kernel UAF (CVE-2026-20971) https://lucidbitlabs.com/blog/when-defenses-become-attack-surface/ #infosec https://t.co/2Nc0TMstDD

App to Kernel UAF memory corruption in Samsung devices (CVE-2026-20971) https://lucidbitlabs.com/blog/when-defenses-become-attack-surface/ #infosec https://t.co/QBuGWmN6xk

CVE-2026-20971: Samsung Android kernel UAF affecting Galaxy S9-S25 https://lucidbitlabs.com/blog/when-defenses-become-attack-surface/

#Kernel_Security When Defenses Become Attack Surface: CVE-2026-20971, a Samsung Kernel UAF https://lucidbitlabs.com/blog/when-defenses-become-attack-surface // Target: Samsung Android Kernel. Affected Devices: Galaxy S9 through Galaxy S25, A-series, Exynos, and Qualcomm devices. Impact: App to Kernel memory corruption. Status: Reported by LucidBit, fixed on Samsung's January 2026 Android security update CyberPocket makes cybersecurity alerts easy to understand. Paste an alert, upload a screenshot, or submit a security message, and CyberPocket turns confusing technical details into a clear summary, risk level, next steps, and client-ready ticket notes. Built for individuals, students, IT teams, MSPs, MSSPs, and SOC analysts, CyberPocket helps you triage faster, learn smarter, and respond with confidence. Visit http://cyberpocket.org and turn confusing alerts into clear action.

When Defenses Become Attack Surface: CVE-2026-20971, a Samsung Kernel UAF https://lucidbitlabs.com/blog/when-defenses-become-attack-surface/ https://t.co/15yPwxmBcu

CVE-2026-20971: Samsung Android kernel UAF affecting Galaxy S9-S25 https://lucidbitlabs.com/blog/when-defenses-become-attack-surface/

Last week we disclosed CVE-2026-20971: a Samsung KNOX kernel UAF affecting Galaxy S9-S25 devices. It was later covered by SecurityWeek and Security Affairs. Technical writeup: https://lucidbitlabs.com/blog/when-defenses-become-attack-surface/

Ein Kernel-Bug gefährdet Millionen Samsung Galaxy-Geräte seit 8 Jahren. Lucid Bit Labs entdeckte CVE-2026-20971. Prüft euren Januar-Patch! https://www.schmidtisblog.de/acht-jahre-ungepatcht-speicherfehler-gefaehrdet-millionen-samsung-galaxy-smartphones-1809996/

An eight-year-old Samsung KNOX vulnerability, CVE-2026-20971, let an untrusted app corrupt kernel memory on Galaxy phones from the S9 to the S25. #Samsung #KNOX #AndroidSecurity #UseAfterFree #Galaxy https://securityexpress.info/samsung-knox-vulnerability https://t.co/xAy9QbuVPC

CVE-2026-20971, a use-after-free in Samsung's PROCA kernel component, affected Galaxy S9 through S25 devices for years before patching in January 2026. https://ift.tt/F1AXV72

A use-after-free vulnerability in Samsung KNOX affecting hundreds of millions of Galaxy devices and tracked as CVE-2026-20971 was disclosed by LucidBit, with Samsung releasing a fix in January 2026. https://t.co/eLOw7KNkxX

CVE-2026-20971 (CVSS 7.8) in Samsung KNOX affected Galaxy S9-S25 and A-series phones on Android 13-16. A race condition in the PROCA process authenticator lets an untrusted app read freed memory before the FIVE integrity subsystem clears it, enabling kernel corruption. Fixed in Samsung's January 2026 SMR update; verify managed Android devices in your MDM inventory have applied the patch.

Vedeli ste o o osem rokov starej vysoko závažnej zraniteľnosti typu use-after-free v Samsungovom rámci KNOX? Ide o CVE-2026-20971 s hodnotením CVSS 7.8, ktorá umožňuje útoky na kernel na miliónoch zariadení Galaxy. Chyba vzniká z race condition (pretekov) medzi autentifikáciou procesu PROCA a kontrolami integrity jadra FIVE počas volania execve(). Zraniteľnosť je zneužiteľná lokálne z nedôveryhodnej aplikácie, pričom vyžaduje interakciu používateľa. Postihnuté sú všetky Android zariadenia Galaxy od rady S9 až po S25 (verzie Android 13 – 16). Samsung chybu opravil v bezpečnostnej aktualizácii z januára 2026. #samsung #knox #exploit

App to Kernel UAF memory corruption in Samsung devices (CVE-2026-20971) demonstrates how security defenses can become attack surfaces. Critical reminder that firmware patches must address kernel vulnerabilities directly.

Samsung Knox'ta 8 yıllık açık: Galaxy S9'dan S25'e kadar tüm cihazlar etkileniyor! LucidBit Labs, Samsung Knox'un PROCA ve FIVE bileşenlerinde bir use-after-free açığı keşfetti. CVE-2026-20971 (CVSS 7.8), Exynos ve Qualcomm çipli geniş bir cihaz yelpazesini etkiliyor. • Bir iş parçacığı belleğe işaretçi alırken askıya alınıyor, başka bir iş parçacığı belleği serbest bırakıyor — sonra ilk iş parçacığı boş belleğe erişmeye devam ediyor. • KCFI korumasını atlatmak için çalıştırılamayan dosyalar yüklemeye zorlanan işlemler kullanıldı. • Android 13, 14, 15 ve 16'yı etkiliyor; yama Ocak 2026 güvenlik güncellemesiyle geldi. Fiziksel erişim gerektirse de başka zararlı yazılımlarla birleşince kurumsal ağlara sızma riski taşıyor! #SiberGüvenlik #Samsung #GüvenlikAçığı

Update: dailysecurityreview assigns a specific CVSS score of 7.8 to CVE-2026-20971, providing quantified severity metric not included in the original post. https://ift.tt/tNySbCR

@LiorKesh The uncomfortable signal in CVE-2026-20971 is that hardening code can expand attack surface. “Defense mechanism” bugs are the ones teams tend to trust longest.

보안업체 루시드비트 랩스(LucidBit Labs)는 2026년 6월 22일 CVE-2026-20971 취약점의 분석 결과를 공개했다. 삼성전자는 이에 앞서 2026년 1월 보안 업데이트를 통해 문제를 수정했다. 출처 : 데일리시큐(https://www.dailysecu.com)

Samsung KNOX Kernel UAF Exposes Millions of Galaxy Devices: 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… https://securityaffairs.com/194090/security/samsung-knox-kernel-uaf-exposes-millions-of-galaxy-devices.html?utm_source=dlvr.it&utm_medium=twitter