CVE-2026-64459
Description
A flaw was found in the Linux kernel's TCP-AO (TCP Authentication Option) implementation. An unprivileged local user can exploit a use-after-free vulnerability in the tcp_ao_destroy_sock() function. By manipulating TCP sockets with TCP_MD5SIG and TCP_AO_ADD_KEY, an attacker can trigger a race condition during socket connection. This can lead to a system crash, resulting in a Denial of Service (DoS).
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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