PT-2025-49072 · Linux+3 · Linux Kernel+3

Published 2025-08-25 · Updated 2026-05-07 · CVE-2025-40245

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 on nios2 systems where the memblock.current limit is not properly initialized when CONFIG FLATMEM is enabled. This can lead to max low pfn exceeding the valid range of available DRAM, potentially causing kernel-level paging failures and system crashes, such as a kernel panic. The issue arises because the kernel relies on memblock get current limit() to determine memory limits, but memblock.current limit is only initialized to MEMBLOCK ALLOC ANYWHERE at a certain point during bootup. The patch resolves this by pre-calculating memblock.current limit based on available memory ranges using adjust lowmem bounds.

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

Exploit

Weakness Enumeration

CWE-457

Related Identifiers

BDU:2026-01368

CVE-2025-40245

USN-8029-1

USN-8029-2

USN-8029-3

USN-8030-1

USN-8033-1

USN-8033-2

USN-8033-3

USN-8033-4

USN-8033-5

USN-8033-6

USN-8033-7

USN-8033-8

USN-8034-1

USN-8034-2

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-8141-1

USN-8163-1

USN-8163-2

USN-8165-1

USN-8243-1

USN-8261-1

Affected Products

Debian

Linuxmint

Linux Kernel

Ubuntu

References · 1707

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40245.json · Exploit
• https://ubuntu.com/security/CVE-2025-40269 · Vendor Advisory
• 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-2025-40030 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38251 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68319 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38543 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40098 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38702 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8030-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40359 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23026 · Vendor Advisory