CVE-2026-126861
Description
A flaw was found in the chromium-browser Media component. A remote attacker could execute arbitrary code within the browser sandbox by tricking a user into viewing a crafted HTML page. This issue occurs due to a use-after-free condition, where the application attempts to access memory after it has already been released.
Statement
This vulnerability is rated as Important severity because an unauthenticated remote attacker could compromise the application process by enticing a user into opening malicious web content. Although execution is confined within the browser's sandbox environment, the ability to trigger remote code execution without privileges elevates the severity above Moderate. In typical Red Hat Enterprise Linux installations, chromium-browser is an optional desktop utility rather than an always-on system service, restricting the blast radius to the unprivileged interactive session of the browsing user.
Mitigation
Operational controls can reduce the risk of exploitation:
1. Restrict browser usage to trusted internal applications and avoid processing media from untrusted external sources.
2. Ensure the built-in browser sandbox remains active and is never bypassed with command-line flags.
3. If web browsing functionality is not required on the system, remove the chromium-browser package to eliminate exposure.
Caveats:
These operational measures reduce exposure to untrusted content but do not eliminate the underlying memory corruption issue if a malicious page is visited.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
If the expired pointer is used in a read operation, an attacker might be able to control data read in by the application.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If the expired pointer references a memory location that is not accessible to the product, or points to a location that is "malformed" (such as NULL) or larger than expected by a read or write operation, then a crash may occur.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If the expired pointer is used in a function call, or points to unexpected data in a write operation, then code execution may be possible.
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