CVE-2026-118305
Description
A memory corruption flaw was found in the Turbolev 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 (2026-11-03) ---
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 Stack validation on indirect branch targets to block ROP and JOP execution chains resulting from Turbolev memory corruption: upgrade to Chromium 156.0.8078.73 (or the fixed Chromium builds), which resolves the memory corruption vulnerability in the Turbolev component to prevent out-of-bounds memory access and arbitrary code execution outside the sandbox, closing crafted HTML page. Until patched, this is a concern on deployments running Chromium across any platform where users access untrusted web content, so restrict browser access to trusted web destinations and isolate untrusted web browsing sessions to prevent users from loading malicious or compromised web pages. As a compensating measure, enable Address Space Layout Randomization to randomize process memory layout and hinder reliable execution hijacking, enforce non-executable memory protections via NX and XD bits to prevent code execution from heap or stack data regions, enforce Full RELRO and Position Independent Executables to make relocation tables read-only and randomize binary code offsets, apply seccomp kernel-level syscall filtering to restrict system calls available to the browser process and impede sandbox breakouts, enable JIT compiler hardening and memory sandbox isolation to constrain browser execution and isolate memory bounds, and deploy endpoint detection and response monitoring to detect abnormal process behaviors and post-exploitation execution. These controls limit blast radius and contain exploitation, but they do not fix the underlying memory corruption 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,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands; Modify Memory
This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. If the memory accessible by the attacker can be effectively controlled, it may be possible to execute arbitrary code, as with a standard buffer overflow. If the attacker can overwrite a pointer's worth of memory (usually 32 or 64 bits), they can alter the intended control flow by redirecting a function pointer to their own malicious code. Even when the attacker can only modify a single byte, arbitrary code execution can be possible. Sometimes this is because the same problem can be exploited repeatedly to the same effect. Other times it is because the attacker can overwrite security-critical application-specific data -- such as a flag indicating whether the user is an administrator.
Availability,Confidentiality
Technical Impact: Read Memory; DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
Out of bounds memory access will very likely result in the corruption of relevant memory, and perhaps instructions, possibly leading to a crash. Other attacks leading to lack of availability are possible, including putting the program into an infinite loop.
Confidentiality
Technical Impact: Read Memory
In the case of an out-of-bounds read, the attacker may have access to sensitive information. If the sensitive information contains system details, such as the current buffer's position in memory, this knowledge can be used to craft further attacks, possibly with more severe consequences.
Frequently Asked Questions
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