CVE-2026-15777: Google Chrome Use After Free Vulnerability

CVE-2026-15777 Overview

CVE-2026-15777 is a use-after-free vulnerability [CWE-416] in the user interface component of Google Chrome on Linux. The flaw affects Chrome versions prior to 150.0.7871.125. A remote attacker who convinces a user to perform specific UI gestures can trigger heap corruption through a crafted HTML page. Google classifies the Chromium security severity as High.

Successful exploitation may lead to arbitrary code execution within the renderer or browser process context. The attack requires user interaction, which raises the complexity barrier but does not eliminate the risk for targeted phishing or drive-by attack scenarios.

Critical Impact
Remote attackers can trigger heap corruption in Chrome on Linux via a crafted HTML page combined with user-driven UI gestures, potentially leading to arbitrary code execution.

Affected Products

Google Chrome on Linux prior to 150.0.7871.125
Chromium-based browsers sharing the same UI codebase
Linux desktop environments running vulnerable Chrome builds

Discovery Timeline

2026-07-14 - CVE-2026-15777 published to the National Vulnerability Database (NVD)
2026-07-15 - Last updated in NVD database

Technical Details for CVE-2026-15777

Vulnerability Analysis

The vulnerability is a use-after-free condition in Chrome's UI subsystem on Linux. Use-after-free occurs when a program references memory after it has been freed, allowing attackers to manipulate freed heap regions. In browser contexts, this class of bug commonly enables attackers to overwrite object vtables or function pointers.

The attack chain requires a victim to visit a crafted HTML page and perform specific UI interactions. These gestures cause the UI component to release an object while a dangling reference remains active. Subsequent access to the freed memory triggers heap corruption exploitable for code execution.

Exploitation complexity is elevated because the attacker cannot fully control when the user performs the required gestures. However, social engineering pretexts such as click-to-play prompts, fake CAPTCHAs, or interactive advertisements can reliably elicit the needed interactions.

Root Cause

The root cause is improper object lifetime management in the UI layer. A reference persists after the underlying heap allocation has been freed. Chrome UI code, which handles complex asynchronous interactions between the browser process and user input, must coordinate object destruction with pending callbacks and event handlers. A missed reference count decrement or a race between UI event handling and object teardown creates the dangling pointer.

Attack Vector

The attack vector is remote and network-based. An attacker hosts a malicious HTML page or injects malicious content into a trusted site. The victim visits the page and interacts with UI elements crafted to trigger the vulnerable code path. No authentication is required, but user interaction is mandatory.

The vulnerability affects the browser UI, not the sandboxed renderer alone, which increases post-exploitation impact. Refer to the Chromium Issue Tracker Entry for additional technical context once details become public.

Detection Methods for CVE-2026-15777

Indicators of Compromise

Chrome browser process crashes with heap corruption signatures on Linux endpoints running versions prior to 150.0.7871.125
Unexpected child processes spawned by the Chrome browser process following user browsing activity
HTML pages containing anomalous UI interaction patterns designed to elicit specific clicks, hovers, or drag gestures

Detection Strategies

Monitor endpoint telemetry for Chrome process crashes accompanied by signals such as SIGSEGV or Address Sanitizer reports on Linux hosts
Correlate browser crash events with recent navigation to newly registered or low-reputation domains
Inspect network traffic for HTML payloads that combine unusual DOM structures with scripts driving specific pointer or keyboard interactions

Monitoring Recommendations

Track Chrome version inventory across Linux fleets to identify hosts running builds older than 150.0.7871.125
Enable browser crash reporting and forward reports to a centralized analytics platform for review
Alert on child processes launched from Chrome that execute shell interpreters, package managers, or download utilities

How to Mitigate CVE-2026-15777

Immediate Actions Required

Update Google Chrome on all Linux endpoints to version 150.0.7871.125 or later
Verify Chromium-based browsers packaged by Linux distributions have received equivalent backported fixes
Communicate the risk of interacting with untrusted pages until patching is complete

Patch Information

Google addressed CVE-2026-15777 in the stable channel update documented in the Google Chrome Desktop Update. Administrators should confirm deployed versions are at or above 150.0.7871.125. Distribution-packaged Chromium builds should be updated through the relevant package manager once vendors publish rebuilt packages.

Workarounds

Restrict browsing on Linux workstations to trusted sites until updates are deployed
Deploy enterprise browser policies that block execution of scripts on untrusted origins
Consider temporarily using an alternative browser on unpatched Linux hosts for high-risk browsing activities

bash

# Verify installed Chrome version on Linux
google-chrome --version

# Update Chrome via apt (Debian/Ubuntu)
sudo apt update && sudo apt install --only-upgrade google-chrome-stable

# Update Chrome via dnf (Fedora/RHEL)
sudo dnf upgrade google-chrome-stable