CVE-2026-58724: System Use-After-Free Race Vulnerability

CVE-2026-58724 Overview

CVE-2026-58724 is a use-after-free vulnerability in Android caused by a race condition across multiple code locations. The flaw allows a local attacker with low privileges to escalate to System execution privileges without user interaction. Google disclosed the issue in the September 2026 Android Security Bulletin.

The vulnerability is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization. Successful exploitation grants the attacker high impact on confidentiality, integrity, and availability of the affected device.

Critical Impact
Local attackers holding low-privilege code execution can escalate to System privileges on affected Android devices, bypassing the app sandbox entirely.

Affected Products

Android (multiple versions covered by the September 2026 Android Security Bulletin)
Google Pixel devices per the Pixel Update Bulletin
Downstream Android OEM builds incorporating the affected components

Discovery Timeline

2026-09-15 - CVE-2026-58724 published to the National Vulnerability Database
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-58724

Vulnerability Analysis

The vulnerability is a use-after-free condition triggered by a race between concurrent threads operating on the same object. When two execution paths access shared memory without proper synchronization, one thread can free an object while another retains and uses a stale reference. This dangling pointer access enables memory corruption that an attacker can shape into arbitrary code execution.

The advisory notes that the pattern appears in multiple locations, indicating a systemic synchronization weakness rather than a single isolated bug. Exploitation requires local access and low-privilege code execution, such as from a malicious or compromised application already installed on the device. No user interaction is required once the malicious code runs.

Root Cause

The root cause is improper synchronization on shared resources, categorized as [CWE-362]. Object lifetime management is not atomic with respect to concurrent access. A thread frees an object while another thread still holds a pointer, and the freed slot is later reallocated with attacker-controlled data.

Attack Vector

The attack vector is local. An attacker must first achieve code execution at low privilege, typically inside a sandboxed application. From that foothold, the attacker races the vulnerable code path to trigger the use-after-free, corrupts kernel or privileged-service memory, and escalates to System privileges. High attack complexity reflects the timing precision needed to win the race.

No public proof-of-concept exploit is listed at the time of publication. Technical details are documented in the Android Security Bulletin September 2026.

Detection Methods for CVE-2026-58724

Indicators of Compromise

Unexpected process crashes or SIGSEGV signals in privileged Android system services logged via logcat and tombstone files under /data/tombstones/.
Applications originating from untrusted sources performing rapid, repeated invocations of the same system API to force a race window.
Post-exploitation activity by processes that briefly execute with uid=1000 (System) after originating from an unprivileged application UID.

Detection Strategies

Monitor Android device build fingerprints and security patch levels across your mobile fleet to identify devices missing the September 2026 patch level.
Ingest mobile telemetry from EDR-capable mobile agents to identify anomalous privilege transitions and unexpected native crashes in system_server or bound system services.
Correlate application install events with subsequent crashes in privileged services to identify potential exploitation attempts.

Monitoring Recommendations

Track the ro.build.version.security_patch property across managed Android devices and alert on values earlier than 2026-09-01.
Alert on repeated tombstone generation in privileged Android processes, which can indicate failed exploitation attempts against race-condition bugs.
Review sideloaded application install activity in mobile device management (MDM) telemetry and correlate with kernel or system service instability.

How to Mitigate CVE-2026-58724

Immediate Actions Required

Apply the September 2026 Android security patch level (2026-09-01 or later) to all managed devices as soon as OEM builds are available.
Restrict installation of applications from unknown sources through MDM policy to reduce the local attacker foothold required for exploitation.
Audit installed applications for unnecessary or untrusted software and remove anything not required for business use.

Patch Information

Google addressed CVE-2026-58724 in the September 2026 Android Security Bulletin. Devices must be updated to the 2026-09-01 security patch level or later. Refer to the Android Security Bulletin September 2026 for the list of fixed components and the corresponding AOSP commits. OEM patch delivery timing varies; consult device manufacturer bulletins for firmware availability.

Workarounds

No vendor-supplied workarounds are documented; patching remains the only supported remediation.
Enforce Google Play Protect and disable sideloading through MDM configuration to reduce exposure to malicious local applications.
Segment high-value users onto devices that receive timely security updates directly from Google or an OEM with a fast patch cadence.

bash

# Verify Android security patch level on a managed device via adb
adb shell getprop ro.build.version.security_patch
# Expected output for remediated devices: 2026-09-01 or later