CVE-2025-37818

Kernel crash via invalid PMD misclassification

Published May 8, 2025 · Updated May 11, 2026

Denial of service in the Linux kernel on LoongArch allows local users to crash the kernel through an invalid huge-page mapping. huge_pte_offset() returns a PMD-slot pointer for invalid_pte_table; smaps_hugetlb_range() then treats its address as a migration swap entry and reaches pfn_swap_entry_to_page(). A low-privileged local process must cause the invalid huge-page entry to be inspected; the reported consequence is a kernel crash only.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel on LoongArch allows local users to crash the kernel through an invalid huge-page mapping. huge_pte_offset() returns a PMD-slot pointer for invalid_pte_table; smaps_hugetlb_range() then treats its address as a migration swap entry and reaches pfn_swap_entry_to_page(). A low-privileged local process must cause the invalid huge-page entry to be inspected; the reported consequence is a kernel crash only.

The record

CVE
CVE-2025-37818
Published
May 8, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.19
  2. Affected versionversion=fa96b57c149061f71a70bd6582d995f6424fbbf4 <2ca9380b12711afe95b3589bd82b59623b3c96b3
  3. Affected versionversion=fa96b57c149061f71a70bd6582d995f6424fbbf4 <34256805720993e37adf6127371a1265aea8376a
  4. Affected versionversion=fa96b57c149061f71a70bd6582d995f6424fbbf4 <51424fd171cee6a33f01f7c66b8eb23ac42289d4
  5. Affected versionversion=fa96b57c149061f71a70bd6582d995f6424fbbf4 <b49f085cd671addbda4802d6b9382513f7dd0f30
  6. Affected versionversion=fa96b57c149061f71a70bd6582d995f6424fbbf4 <bd51834d1cf65a2c801295d230c220aeebf87a73

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=fa96b57c149061f71a70bd6582d995f6424fbbf4 <2ca9380b12711afe95b3589bd82b59623b3c96b3; version=fa96b57c149061f71a70bd6582d995f6424fbbf4 <34256805720993e37adf6127371a1265aea8376a; version=fa96b57c149061f71a70bd6582d995f6424fbbf4 <51424fd171cee6a33f01f7c66b8eb23ac42289d4; version=fa96b57c149061f71a70bd6582d995f6424fbbf4 <b49f085cd671addbda4802d6b9382513f7dd0f30; version=fa96b57c149061f71a70bd6582d995f6424fbbf4 <bd51834d1cf65a2c801295d230c220aeebf87a73

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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