CVE-2026-64320
A flaw in the Linux kernel’s NVMe target discovery feature lets an unauthenticated network peer read memory or crash the system before authentication. By sending a specially crafted Get Log Page request with an out‑of‑bounds offset, an attacker can cause the kernel to copy data beyond the intended buffer, exposing kernel pointers or triggering a crash. The vulnerability is critical because it can be triggered by any host that can reach the NVMe target over TCP, RDMA, or Fibre Channel.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux kernel, specifically the nvmet (NVMe target) component. Any system running an unpatched kernel that exposes an NVMe target over TCP, RDMA, or Fibre Channel is affected.
Real-world impact
An attacker can read kernel memory contents or crash the target, potentially leading to information disclosure or denial of service.
Why this severity
The CVSS score of 9.1 reflects that the vulnerability is exploitable over the network without authentication, has low attack complexity, and can cause complete loss of confidentiality and availability. The lack of user interaction and the ability to read arbitrary kernel memory make it highly dangerous.
What to do about it
- 01Upgrade the Linux kernel to a version that includes the nvmet patch that fixes the out‑of‑bounds heap read in Discovery Get Log Page.
- 02Reboot or restart the system to load the updated kernel.
NVD-referenced vendor advisory
Timeline
- Jul 25, 2026 · 7d agoPublishedDisclosed and added to the National Vulnerability Database.
- Jul 27, 2026 · 5d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.