CVE-2025-37960

Guest boot crash via unaccepted memblock allocation

Published May 20, 2025 · Updated May 11, 2026

Denial of service in the Linux kernel allows local users to crash an SNP guest during boot through early memblock growth. Before slab allocation is available, memblock_double_array() copies the enlarged array into memory returned by memblock_find_in_range() without first accepting that guest memory. The path requires a confidential-computing SNP guest and early-boot memblock expansion; the documented consequence is a guest kernel crash.

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 allows local users to crash an SNP guest during boot through early memblock growth. Before slab allocation is available, memblock_double_array() copies the enlarged array into memory returned by memblock_find_in_range() without first accepting that guest memory. The path requires a confidential-computing SNP guest and early-boot memblock expansion; the documented consequence is a guest kernel crash.

The record

CVE
CVE-2025-37960
Published
May 20, 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 20, 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=6.5
  2. Affected versionversion=dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 <7bcd29181bab8d508d2adfdbb132de8b1e088698
  3. Affected versionversion=dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 <aa513e69e011a2b19fa22ce62ce35effbd5e0c81
  4. Affected versionversion=dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 <d66a22f6a432a9dd376c9b365d7dc89bd416909c
  5. Affected versionversion=dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 <da8bf5daa5e55a6af2b285ecda460d6454712ff4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 <7bcd29181bab8d508d2adfdbb132de8b1e088698; version=dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 <aa513e69e011a2b19fa22ce62ce35effbd5e0c81; version=dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 <d66a22f6a432a9dd376c9b365d7dc89bd416909c; version=dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 <da8bf5daa5e55a6af2b285ecda460d6454712ff4

Published CVSS scores

5.5NIST NVDCVSS: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.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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