CVE-2024-35875

Guest secret compromise via host-controlled boot entropy

Published May 19, 2024 · Updated Aug 5, 2026

Cryptographic weakness in Linux x86 CoCo guests allows attackers controlling the VM host to compromise guest secrets through weak boot entropy. The x86 CoCo initialization path did not require 256 bits from RDRAND before kernel RNG use, so host-controlled inputs could leave the early pool predictably seeded. Exploitation requires a confidential-computing guest at boot and failed or unavailable RDRAND; predictable cryptographic material undermines guest confidentiality and integrity.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cryptographic weakness in Linux x86 CoCo guests allows attackers controlling the VM host to compromise guest secrets through weak boot entropy. The x86 CoCo initialization path did not require 256 bits from RDRAND before kernel RNG use, so host-controlled inputs could leave the early pool predictably seeded. Exploitation requires a confidential-computing guest at boot and failed or unavailable RDRAND; predictable cryptographic material undermines guest confidentiality and integrity.

The record

CVE
CVE-2024-35875
Published
May 19, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.15
  2. Affected versionversion=d8aa7eea78a1401cce39b3bb61ead0150044a3df <08044b08b37528b82f70a87576c692b4e4b7716e
  3. Affected versionversion=d8aa7eea78a1401cce39b3bb61ead0150044a3df <22943e4fe4b3a2dcbadc3d38d5bf840bbdbfe374
  4. Affected versionversion=d8aa7eea78a1401cce39b3bb61ead0150044a3df <453b5f2dec276c1bb4ea078bf8c0da57ee4627e5
  5. Affected versionversion=d8aa7eea78a1401cce39b3bb61ead0150044a3df <99485c4c026f024e7cb82da84c7951dbe3deb584

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.15; version=d8aa7eea78a1401cce39b3bb61ead0150044a3df <08044b08b37528b82f70a87576c692b4e4b7716e; version=d8aa7eea78a1401cce39b3bb61ead0150044a3df <22943e4fe4b3a2dcbadc3d38d5bf840bbdbfe374; version=d8aa7eea78a1401cce39b3bb61ead0150044a3df <453b5f2dec276c1bb4ea078bf8c0da57ee4627e5; version=d8aa7eea78a1401cce39b3bb61ead0150044a3df <99485c4c026f024e7cb82da84c7951dbe3deb584

Published CVSS scores

8.4Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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

See the directory against your own environment.

Your stack

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