CVE-2023-53676 scsi: target: iscsi: Fix buffer overflow in lio_target_nacl_info_show()

What is CVE-2023-53676?

CVE-2023-53676 is a high-severity memory corruption vulnerability in Linux kernel, published on 7 Oct 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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

scsi: target: iscsi: Fix buffer overflow in lio_target_nacl_info_show()

The function lio_target_nacl_info_show() uses sprintf() in a loop to print details for every iSCSI connection in a session without checking for the buffer length. With enough iSCSI connections it's possible to overflow the buffer provided by configfs and corrupt the memory.

This patch replaces sprintf() with sysfs_emit_at() that checks for buffer boundries.

Weakness: CWE-787

Which versions are affected by CVE-2023-53676?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-53676?

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-2023-53676 being exploited?

There is no known exploitation of CVE-2023-53676 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-2023-53676, DEBIAN-CVE-2023-53676, GHSA-4832-crwv-4gfx, SUSE-SU-2025:4507-1, UBUNTU-CVE-2023-53676.