CVE-2025-21993

Severity CVSS v4.0:

Pending analysis

Type:

CWE-125 Out-of-bounds Read

Publication date:

02/04/2025

Last modified:

03/11/2025

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.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.10 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): None
Availability (A): High

Base Score 3.x

7.10

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::		6.1.132 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.2 (including)	6.6.84 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.7 (including)	6.12.20 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.13 (including)	6.13.8 (excluding)
cpe:2.3:o:linux:linux_kernel:6.14:rc1::::::

To consult the complete list of CPE names with products and versions, see this page

CVE-2025-21993

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools