CVE-2024-55881

Host denial of service via hypercall misclassification

Published Jan 11, 2025 · Updated May 23, 2026

Improper hypercall handling in affected Linux KVM kernels allows guest OS users to interrupt host availability via VMGEXIT. complete_hypercall_exit() calls is_64_bit_mode() even when SEV-ES or SEV-SNP hides the vCPU state needed by that test, so a 64-bit hypercall is misclassified. A protected AMD guest able to issue KVM_HC_MAP_GPA_RANGE through VMGEXIT can reach the path and trigger a host-kernel warning.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper hypercall handling in affected Linux KVM kernels allows guest OS users to interrupt host availability via VMGEXIT. complete_hypercall_exit() calls is_64_bit_mode() even when SEV-ES or SEV-SNP hides the vCPU state needed by that test, so a 64-bit hypercall is misclassified. A protected AMD guest able to issue KVM_HC_MAP_GPA_RANGE through VMGEXIT can reach the path and trigger a host-kernel warning.

The record

CVE
CVE-2024-55881
Published
Jan 11, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 11, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=5.15.5 <5.15.176
  2. Affected versionversion=5.16
  3. Affected versionversion=5969e2435cbd7f0ce8c28d717bfc39987ee8d8f1 <0840d360a8909c722fb62459f42836afe32ededb
  4. Affected versionversion=b5aead0064f33ae5e693a364e3204fe1c0ac9af2 <22b5c2acd65dbe949032f619d4758a35a82fffc3
  5. Affected versionversion=b5aead0064f33ae5e693a364e3204fe1c0ac9af2 <3d2634ec0d1dbe8f4b511cf5261f327c6a76f4b6
  6. Affected versionversion=b5aead0064f33ae5e693a364e3204fe1c0ac9af2 <7ed4db315094963de0678a8adfd43c46471b9349
  7. Affected versionversion=b5aead0064f33ae5e693a364e3204fe1c0ac9af2 <9b42d1e8e4fe9dc631162c04caa69b0d1860b0f0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15.5 <5.15.176; version=5.16; version=5969e2435cbd7f0ce8c28d717bfc39987ee8d8f1 <0840d360a8909c722fb62459f42836afe32ededb; version=b5aead0064f33ae5e693a364e3204fe1c0ac9af2 <22b5c2acd65dbe949032f619d4758a35a82fffc3; version=b5aead0064f33ae5e693a364e3204fe1c0ac9af2 <3d2634ec0d1dbe8f4b511cf5261f327c6a76f4b6; version=b5aead0064f33ae5e693a364e3204fe1c0ac9af2 <7ed4db315094963de0678a8adfd43c46471b9349; version=b5aead0064f33ae5e693a364e3204fe1c0ac9af2 <9b42d1e8e4fe9dc631162c04caa69b0d1860b0f0

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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