CVE-2025-37818

MEDIUM EPSS 4.5%
Published May 8, 20251y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 8, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Return NULL from huge_pte_offset() for invalid PMD LoongArch's huge_pte_offset() currently returns a pointer to a PMD slot even if the underlying entry points to invalid_pte_table (indicating no mapping). Callers like smaps_hugetlb_range() fetch this invalid entry value (the address of invalid_pte_table) via this pointer. The generic is_swap_pte() check then incorrectly identifies this address as a swap entry on LoongArch, because it satisfies the "!pte_present() && !pte_none()" conditions. This misinterpretation, combined with a coincidental match by is_migration_entry() on the address bits, leads to kernel crashes in pfn_swap_entry_to_page(). Fix this at the architecture level by modifying huge_pte_offset() to check the PMD entry's content using pmd_none() before returning. If the entry is invalid (i.e., it points to invalid_pte_table), return NULL instead of the pointer to the slot.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
4.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥5.19  –  <6.1.136
linuxlinux_kernel*≥6.2  –  <6.6.89
linuxlinux_kernel*≥6.7  –  <6.12.26
linuxlinux_kernel*≥6.13  –  <6.14.5
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
debiandebian_linux11.0any

References 6

  • git.kernel.org https://git.kernel.org/stable/c/2ca9380b12711afe95b3589bd82b59623b3c96b3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/34256805720993e37adf6127371a1265aea8376a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/51424fd171cee6a33f01f7c66b8eb23ac42289d4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b49f085cd671addbda4802d6b9382513f7dd0f30
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bd51834d1cf65a2c801295d230c220aeebf87a73
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
    Mailing ListThird Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/2ca9380b12711afe95b3589bd82b59623b3c96b3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/34256805720993e37adf6127371a1265aea8376a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/51424fd171cee6a33f01f7c66b8eb23ac42289d4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b49f085cd671addbda4802d6b9382513f7dd0f30
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bd51834d1cf65a2c801295d230c220aeebf87a73
    Patch