CVE-2026-121052
Description
An use after free flaw was found in the GPU 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 isolate untrusted web browsing and restrict access to malicious sites to prevent triggering stale GPU object references within the Chromium sandbox: upgrade to Chromium 157.0.8103.38 (or the fixed Chromium builds), which corrects GPU object lifetime management to prevent use-after-free conditions, closing crafted HTML page. Until patched, this is a concern on Users running Chromium on any platform, so Prevent users from visiting untrusted or compromised web pages and restrict open web browsing in high-trust environments. As a compensating measure, Enable ASLR to randomize process memory layout and impede reliable gadget address prediction, Enforce NX or XD bit non-executable permissions on heap and data pages to prevent direct shellcode execution, Enable Full RELRO and PIE to protect Global Offset Table entries and randomize binary code segments, Enforce Control Flow Integrity to validate indirect call targets and prevent virtual table pointer hijacking, and Deploy EDR agents to monitor and detect anomalous post-exploitation activity originating from the browser sandbox. 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-101 ASLR (Address Space Layout Randomization) (medium)
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
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