CVE-2025-21993 - IBM iSCSI IPv6 Subnet Mask Out-of-Bounds Vulnerability

CVE ID : CVE-2025-21993
Published : April 2, 2025, 1:15 p.m. | 1 hour, 38 minutes ago
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.
Severity: 0.0 | NA
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