CVE-2025-21993
IBM iSCSI IPv6 Subnet Mask Out-of-Bounds Vulnerability
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.
INFO
Published Date :
April 2, 2025, 1:15 p.m.
Last Modified :
April 10, 2025, 1:24 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
5.2
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-21993.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-21993 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-21993 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Apr. 10, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Added CWE CWE-125 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 6.1.132 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.13.8 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.84 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.20 Added Reference Type kernel.org: https://git.kernel.org/stable/c/07e0d99a2f701123ad3104c0f1a1e66bce74d6e5 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a858cd58dea06cf85b142673deea8c5d87f11e70 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b253660fac5e0e9080d2c95e3a029e1898d49afb Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b388e185bfad32bfed6a97a6817f74ca00a4318f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c1c6e527470e5eab0b2d57bd073530fbace39eab Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/f763c82db8166e28f45b7cc4a5398a7859665940 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 10, 2025
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/a858cd58dea06cf85b142673deea8c5d87f11e70 Added Reference https://git.kernel.org/stable/c/b388e185bfad32bfed6a97a6817f74ca00a4318f Added Reference https://git.kernel.org/stable/c/f763c82db8166e28f45b7cc4a5398a7859665940 -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 02, 2025
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/07e0d99a2f701123ad3104c0f1a1e66bce74d6e5 Added Reference https://git.kernel.org/stable/c/2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d Added Reference https://git.kernel.org/stable/c/9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c Added Reference https://git.kernel.org/stable/c/b253660fac5e0e9080d2c95e3a029e1898d49afb Added Reference https://git.kernel.org/stable/c/c1c6e527470e5eab0b2d57bd073530fbace39eab
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-21993 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-21993
weaknesses.