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CVE-2025-21993

iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic() PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected 138fe4e069798d9aa948a5402ff15e58f483ee4e before a858cd58dea06cf85b142673deea8c5d87f11e70; affected 138fe4e069798d9aa948a5402ff15e58f483ee4e before f763c82db8166e28f45b7cc4a5398a7859665940; affected 138fe4e069798d9aa948a5402ff15e58f483ee4e before b388e185bfad32bfed6a97a6817f74ca00a4318f; affected 138fe4e069798d9aa948a5402ff15e58f483ee4e before 9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c; affected 138fe4e069798d9aa948a5402ff15e58f483ee4e before 2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d; affected 138fe4e069798d9aa948a5402ff15e58f483ee4e before b253660fac5e0e9080d2c95e3a029e1898d49afb; affected 138fe4e069798d9aa948a5402ff15e58f483ee4e before c1c6e527470e5eab0b2d57bd073530fbace39eab; affected 138fe4e069798d9aa948a5402ff15e58f483ee4e before 07e0d99a2f701123ad3104c0f1a1e66bce74d6e5
Linux / Linuxaffected 2.6.26; unaffected 0 before 2.6.26; unaffected 5.4.292 through 5.4.*; unaffected 5.10.236 through 5.10.*; unaffected 5.15.180 through 5.15.*; unaffected 6.1.132 through 6.1.*; unaffected 6.6.84 through 6.6.*; unaffected 6.12.20 through 6.12.*; unaffected 6.13.8 through 6.13.*; unaffected 6.14 through *

CWE

No CWE identifiers supplied.

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

CVE

No English description supplied.