CVE-2026-23393
Description
A flaw was found in the Linux kernel's bridge Connectivity Fault Management (CFM) component. A race condition can occur during the deletion of a peer Maintenance Entity Group End Point (MEP). This allows the br_cfm_frame_rx() function to re-schedule a delayed work on a MEP object after it has been marked for deletion but before it is fully freed. This may lead to a use-after-free vulnerability, potentially causing a denial of service or arbitrary code execution.
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.
Frequently Asked Questions
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