CVE-2025-21993
iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()
CVSS Score
7.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Apr 2, 2025 |
| Last Updated | May 11, 2026 |
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Affected Versions
Linux / Linux
138fe4e069798d9aa948a5402ff15e58f483ee4e < a858cd58dea06cf85b142673deea8c5d87f11e70 138fe4e069798d9aa948a5402ff15e58f483ee4e < f763c82db8166e28f45b7cc4a5398a7859665940 138fe4e069798d9aa948a5402ff15e58f483ee4e < b388e185bfad32bfed6a97a6817f74ca00a4318f 138fe4e069798d9aa948a5402ff15e58f483ee4e < 9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c 138fe4e069798d9aa948a5402ff15e58f483ee4e < 2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d 138fe4e069798d9aa948a5402ff15e58f483ee4e < b253660fac5e0e9080d2c95e3a029e1898d49afb 138fe4e069798d9aa948a5402ff15e58f483ee4e < c1c6e527470e5eab0b2d57bd073530fbace39eab 138fe4e069798d9aa948a5402ff15e58f483ee4e < 07e0d99a2f701123ad3104c0f1a1e66bce74d6e5
Linux / Linux
2.6.26
References
git.kernel.org: https://git.kernel.org/stable/c/a858cd58dea06cf85b142673deea8c5d87f11e70 git.kernel.org: https://git.kernel.org/stable/c/f763c82db8166e28f45b7cc4a5398a7859665940 git.kernel.org: https://git.kernel.org/stable/c/b388e185bfad32bfed6a97a6817f74ca00a4318f git.kernel.org: https://git.kernel.org/stable/c/9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c git.kernel.org: https://git.kernel.org/stable/c/2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d git.kernel.org: https://git.kernel.org/stable/c/b253660fac5e0e9080d2c95e3a029e1898d49afb git.kernel.org: https://git.kernel.org/stable/c/c1c6e527470e5eab0b2d57bd073530fbace39eab git.kernel.org: https://git.kernel.org/stable/c/07e0d99a2f701123ad3104c0f1a1e66bce74d6e5 lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html