PT-2025-51611 · Linux+3 · Linux Kernel+3

Published 2025-11-02 · Updated 2026-05-07 · CVE-2025-68198

Positive Technologies (AI Summary)

CVSS v2.0

4.6

Medium

Base vector

AV:L/AC:L/Au:S/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The Linux kernel contains a flaw related to crashkernel resource management. Specifically, when the crashkernel reservation is reduced below the low crashkernel reservation, it can lead to invalid crashkernel resource objects and potentially a kernel crash. This occurs because the crash shrink memory() function within the kernel/crash core.c file incorrectly updates the crashkernel resource object. The issue manifests when shrinking the crashkernel size via the /sys/kernel/kexec crash size interface. The problem is triggered when shrinking the crashkernel memory, leading to a kernel NULL pointer dereference and subsequent crash.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

AZL-72442

BDU:2026-03151

CVE-2025-68198

MGASA-2026-0017

MGASA-2026-0018

OPENSUSE-SU-2026:20145-1

SUSE-SU-2026:20207-1

SUSE-SU-2026:20220-1

SUSE-SU-2026:20228-1

USN-8029-1

USN-8029-2

USN-8029-3

USN-8030-1

USN-8048-1

USN-8095-1

USN-8095-2

USN-8095-3

USN-8095-4

USN-8095-5

USN-8100-1

USN-8125-1

USN-8126-1

USN-8165-1

USN-8261-1

Affected Products

Debian

Linuxmint

Linux Kernel

Ubuntu

References · 2040

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68198.json · Exploit
• https://ubuntu.com/security/CVE-2025-38055 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40092 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21833 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-39788 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38251 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38543 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8030-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40284 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40307 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-37844 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68264 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38677 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38699 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23207 · Vendor Advisory