iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.1epss 0.2%
exploitation probability
0.2%top 89% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/07e0d99a2f701123ad3104c0f1a1e66bce74d6e5https://git.kernel.org/stable/c/2d1eef248107bdf3d5a69d0fde04c30a79a7bf5dhttps://git.kernel.org/stable/c/9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1chttps://git.kernel.org/stable/c/a858cd58dea06cf85b142673deea8c5d87f11e70https://git.kernel.org/stable/c/b253660fac5e0e9080d2c95e3a029e1898d49afbhttps://git.kernel.org/stable/c/b388e185bfad32bfed6a97a6817f74ca00a4318fhttps://git.kernel.org/stable/c/c1c6e527470e5eab0b2d57bd073530fbace39eabhttps://git.kernel.org/stable/c/f763c82db8166e28f45b7cc4a5398a7859665940https://lists.debian.org/debian-lts-announce/2025/05/msg00030.htmlhttps://lists.debian.org/debian-lts-announce/2025/05/msg00045.html