CVE-2025-39778 objtool, nvmet: Fix out-of-bounds stack access in nvmet_ctrl_state_show()

What is CVE-2025-39778?

CVE-2025-39778 is a high-severity memory corruption vulnerability in Linux kernel, published on 18 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

objtool, nvmet: Fix out-of-bounds stack access in nvmet_ctrl_state_show()

The csts_state_names[] array only has six sparse entries, but the iteration code in nvmet_ctrl_state_show() iterates seven, resulting in a potential out-of-bounds stack read. Fix that.

Fixes the following warning with an UBSAN kernel:

vmlinux.o: warning: objtool: .text.nvmet_ctrl_state_show: unexpected end of section

Weakness: CWE-125

Which versions are affected by CVE-2025-39778?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2025-39778?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2025-39778 being exploited?

There is no known exploitation of CVE-2025-39778 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2025-39778, DEBIAN-CVE-2025-39778, GHSA-2h4h-cj8f-67g5, UBUNTU-CVE-2025-39778.