CVE-2026-31657
Description
A flaw was found in the Linux kernel's batman-adv component. The batadv_bla_add_claim() function can improperly drop a reference to a backbone gateway while other parts of the code, such as the netlink claim dump path, still hold and attempt to use a pointer to the freed memory. This creates a use-after-free vulnerability, which could allow a local attacker to cause system instability or 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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