CVE-2026-43249
Description
A flaw was found in the Linux kernel's 9p/xen filesystem driver. A race condition can occur when the xenwatch thread and other back-end change notifications concurrently attempt to free the front-end state using the xen_9pfs_front_free function. This can lead to a double-free vulnerability, resulting in a general protection fault and causing a system crash. This issue primarily impacts system availability.
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Modify Application Data; Modify Memory; DoS: Crash, Exit, or Restart; Execute Unauthorized Code or Commands
It may be possible to cause data corruption and possibly execute arbitrary code by modifying global variables or data structures at unexpected times, violating the assumptions of code that uses this global data.
Access Control
Technical Impact: Gain Privileges or Assume Identity
If a signal handler interrupts code that is executing with privileges, it may be possible that the signal handler will also be executed with elevated privileges, possibly making subsequent exploits more severe.
Frequently Asked Questions
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