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CVE-2025-21993

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 prefixlength is 64, this causes the shift exponent to become negative,triggering a UBSAN warning. As the concept of a subnet mask does notapply to IPv6, the value is set to ~0 to suppress the warning message.

POC

Reference

No PoCs from references.

Github

- https://github.com/ARPSyndicate/cve-scores

- https://github.com/fkie-cad/nvd-json-data-feeds

- https://github.com/runwhen-contrib/helm-charts

- https://github.com/w4zu/Debian_security