How severe is CVE-2025-21993?

This vulnerability has a severity rating of HIGH with a CVSS score of 7.1 out of 10.

What type of vulnerability is CVE-2025-21993?

This is classified as CWE-125, which is a common weakness in software security.

CVE-2025-21993 - HIGH Severity | CVSS 7.1

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic() When performing an iSCSI boot using IPv6, iscsistart still reads the /sys/firmware/ibft/ethernetX/subnet-mask entry. Since the IPv6 prefix length is 64, this causes the shift exponent to become negative, triggering a UBSAN warning. As the concept of a subnet mask does not apply to IPv6, the value is set to ~0 to suppress the warning message.

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