CVE-2026-63827
Description
A flaw was found in the Linux kernel's AppArmor security module. A use-after-free vulnerability exists in the aa_replace_profiles() function due to an issue with reference counting during policy data deduplication. This flaw occurs when the system attempts to access memory that has already been freed, which can lead to system instability and denial of service. While the immediate impact observed is system warnings, such vulnerabilities can potentially be exploited by a local attacker to escalate privileges or disclose sensitive information.
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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