Out-of-bounds Read Affecting kernel-64k package, versions <0:6.12.0-55.12.1.el10_0


Severity

Recommended
medium

Based on CentOS security rating.

Threat Intelligence

EPSS
0.02% (4th percentile)

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  • Snyk IDSNYK-CENTOS10-KERNEL64K-10299528
  • published4 Jun 2025
  • disclosed2 Apr 2025

Introduced: 2 Apr 2025

CVE-2025-21993  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Centos:10 kernel-64k to version 0:6.12.0-55.12.1.el10_0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-64k package and not the kernel-64k package as distributed by Centos. See How to fix? for Centos:10 relevant fixed versions and status.

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 Base Scores

version 3.1