# CVE-2026-64320: Linux Kernel nvmet out-of-bounds heap read in Discovery Get Log Page

Source: https://junglewise.ai/threats/cve-2026-64320-linux-kernel-nvmet-out-of-bounds-heap-read-in-discovery-get-log  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-25. Updated: 2026-07-25  
License: CC BY 4.0 with a link back

CVE-2026-64320 · Severity: info · CVSS 8.2 · Published 2026-07-25

A vulnerability in the Linux kernel's NVMe target implementation allows unauthenticated remote attackers to read sensitive information from the system's memory or cause a system crash. The issue exists in the Discovery service, which helps computers find storage resources over a network. An attacker can exploit this to leak internal kernel data or disrupt storage services, potentially leading to a full system outage.

Technologies: [Linux Kernel](https://junglewise.ai/threats/technologies/kernel). Vendors: [Linux](https://junglewise.ai/threats/vendors/linux).

## Quick answers

**Is CVE-2026-64320 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-64320 being exploited in the wild.

**How severe is CVE-2026-64320?** Informational severity, with a CVSS score of 8.2, published 25 July 2026.

**Which products and versions are affected?** Linux Kernel a07b4970f464 to 33b974eb6261.

**Is there a fix for CVE-2026-64320?** A patch was published on 2026-07-18: Fix committed to stable kernel trees Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-64320 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-64320?** Check whether you run Linux Kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An out-of-bounds heap read exists in nvmet_execute_disc_get_log_page() within the Linux kernel's NVMe target (nvmet) implementation. The function fails to validate the host-supplied 64-bit Log Page Offset (lpo) against the size of the allocated buffer. Because the Discovery controller is unauthenticated, any network peer (TCP/RDMA/FC) can provide a large offset to read adjacent kernel heap memory or trigger a kernel panic by accessing unmapped memory. Attackers can leak sensitive kernel pointers or cause a denial-of-service. The issue has been resolved by validating the offset against the log page size and capping the copy length.

## Affected products

- Linux Linux Kernel a07b4970f464 to 33b974eb6261

## Timeline

- 2026-05-27: other: Vulnerability reported by researcher
- 2026-07-18: patched: Fix committed to stable kernel trees
- 2026-07-25: disclosed: CVE published

## References

- [https://git.kernel.org/stable/c/33b974eb626154ae9348f2bac7de84cb2a3d9dd4](https://git.kernel.org/stable/c/33b974eb626154ae9348f2bac7de84cb2a3d9dd4)
- [https://git.kernel.org/stable/c/53cd102a7a56079b11b897835bd9b94c14e6322c](https://git.kernel.org/stable/c/53cd102a7a56079b11b897835bd9b94c14e6322c)
- [https://git.kernel.org/stable/c/56c021a0869260d04c4b65d1471936aaf9177114](https://git.kernel.org/stable/c/56c021a0869260d04c4b65d1471936aaf9177114)
- [https://git.kernel.org/stable/c/a29b316b9bbfd269f323ab4ba9906a894025680f](https://git.kernel.org/stable/c/a29b316b9bbfd269f323ab4ba9906a894025680f)

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