CVE-2026-43388
Description
A flaw was found in the Linux kernel's DAMON (Data Access MONitor) subsystem. The damos_walk() function in mm/damon/core fails to clear a dangling pointer when a context is inactive and an error occurs. This issue can lead to a temporary denial of service (DoS) for subsequent calls to damos_walk(), potentially confusing users. Although a use-after-free vulnerability was identified, it is not exploitable in practice.
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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