CyberRota Analysis
This is a high severity vulnerability with a CVSS score of 7.1. It affects Linux.
CVE
CVE-2025-21993
Severity
HIGH
CVSS
7.1
EPSS
0.20%
Linux
Original NVD 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.
Related CVEs
Other vulnerabilities affecting the same vendor(s)