CVE-2026-89559
Description
A flaw was found in the Linux kernel's libnvdimm/labels component. An integer overflow vulnerability exists in the __nd_label_validate() function, where a 32-bit calculation of a namespace index field (nslot) can wrap around. This allows a local attacker, or an attacker with control over the storage medium, to provide a specially crafted nslot value. This crafted value can bypass security checks, leading to an out-of-bounds write and potential memory corruption.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
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