Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2025-21993

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 1.8%
CVSS Severity
CVSS v3 Score 7.1
Products affected by CVE-2025-21993


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