PT-2024-36982 · Linux+3 · Linux Kernel+3

Published 2024-12-11 · Updated 2025-09-29 · CVE-2024-56673

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.12.0-00982-gf2a4f1682d07

Description The issue is related to the vmemmap page table code in the Linux kernel for RV64 with SPARSEMEM VMEMMAP. The pmd allocation does not use the generic mechanism, resulting in the pmd constructor not being called. When tearing down a vmemmap page table pmd, the cleanup code incorrectly calls the pmd destructor, leading to a crash. This issue was found when running the HMM selftests.

Recommendations To resolve this issue, apply a patch that adds a check to avoid calling the pmd dtor if the calling context is vmemmap free(). Update to a version of the Linux kernel that includes this fix.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALSA-2025_16880

ALT-PU-2024-17881

BDU:2025-15361

CVE-2024-56673

USN-7379-1

USN-7379-2

USN-7380-1

USN-7381-1

USN-7382-1

Affected Products

Alt Linux

Linuxmint

Linux Kernel

Ubuntu

References · 342

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56673.json · Exploit
• https://ubuntu.com/security/CVE-2024-56639 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-56593 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-56602 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-56594 · Vendor Advisory
• https://git.kernel.org/stable/c/344945806f2f7af68be98bac02836c867f223aa9 · Patch
• https://ubuntu.com/security/CVE-2024-36476 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-56659 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-56580 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-56588 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2024-56673 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-57791 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-57799 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-52319 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-56622 · Vendor Advisory