CVE-2026-121127
Description
An use after free flaw was found in the WebAudio component of the Chromium browser.
Upstream bug(s):
Statement
Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory.
Mitigation
--- CME Mitigation Guidance (2026-11-04) ---
Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure.
The highest-value action is to enforce control-flow integrity and shadow call stacks to block indirect call hijacking on corrupted WebAudio objects: upgrade to Chromium 157.0.8103.38 (or the fixed Chromium builds), which resolves the use-after-free condition in the WebAudio component during audio processing, closing crafted HTML page invoking WebAudio APIs. Until patched, this is a concern on users navigating to untrusted or compromised websites in Chromium, so restrict user browsing to trusted domains and enforce browser sandboxing or web isolation policies. As a compensating measure, enable address space layout randomization to hinder predictable gadget and buffer positioning during exploit staging, enforce non-executable page permissions on heap segments to block direct execution of injected shellcode in WebAudio buffers, enforce full RELRO and position-independent execution to constrain memory address leaks and prevent Global Offset Table overwrites, and deploy endpoint detection and response agents to detect and terminate anomalous child process spawning or shellcode execution from browser renderers. These controls limit blast radius and contain exploitation, but they do not fix the underlying use-after-free defect — apply the upstream patch to fully remediate.
Highest-impact CME: CME-113 Control Flow Integrity (CFI / Shadow Call Stack) (high)
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory
The use of previously freed memory may corrupt valid data, if the memory area in question has been allocated and used properly elsewhere.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If chunk consolidation occurs after the use of previously freed data, the process may crash when invalid data is used as chunk information.
Confidentiality
Technical Impact: Read Memory
Read operations on freed memory can sometimes leak sensitive information instead of causing a crash
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If malicious data is entered before chunk consolidation can take place, it may be possible to take advantage of a write-what-where primitive to execute arbitrary code. If the newly allocated data happens to hold a class, in C++ for example, various function pointers may be scattered within the heap data. If one of these function pointers is overwritten with an address to valid shellcode, execution of arbitrary code can be achieved.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
