CVE-2025-21993
HIGHLinux Kernel - Out-of-bounds Read in iSCSI iBFT NIC Attribute Handling
Title source: llmDescription
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.
References (10)
Core 10
Core References
Scores
CVSS v3
7.1
EPSS
0.0019
EPSS Percentile
8.3%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-125
Status
published
Products (27)
linux/Kernel
2.6.26 - 5.4.292linux
linux/Kernel
5.11.0 - 5.15.180linux
linux/Kernel
5.16.0 - 6.1.132linux
linux/Kernel
5.5.0 - 5.10.236linux
linux/Kernel
6.13.0 - 6.13.8linux
linux/Kernel
6.2.0 - 6.6.84linux
linux/Kernel
6.7.0 - 6.12.20linux
Linux/Linux
< 2.6.26
Linux/Linux
138fe4e069798d9aa948a5402ff15e58f483ee4e - 07e0d99a2f701123ad3104c0f1a1e66bce74d6e5
Linux/Linux
138fe4e069798d9aa948a5402ff15e58f483ee4e - 2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d
... and 17 more
Published
Apr 02, 2025
Tracked Since
Feb 18, 2026