CVE-2025-39998

Technical Description

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

scsi: target: target_core_configfs: Add length check to avoid buffer overflow

A buffer overflow arises from the usage of snprintf to write into the

buffer "buf" in target_lu_gp_members_show function located in

/drivers/target/target_core_configfs.c. This buffer is allocated with

size LU_GROUP_NAME_BUF (256 bytes).

snprintf(...) formats multiple strings into buf with the HBA name

(hba->hba_group.cg_item), a slash character, a devicename (dev->

dev_group.cg_item) and a newline character, the total formatted string

length may exceed the buffer size of 256 bytes.

Since snprintf() returns the total number of bytes that would have been

written (the length of %s/%sn ), this value may exceed the buffer length

(256 bytes) passed to memcpy(), this will ultimately cause function

memcpy reporting a buffer overflow error.

An additional check of the return value of snprintf() can avoid this

buffer overflow.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References