CVE-2024-35939

Guest compromise via freed decrypted DMA pages

Published May 19, 2024 · Updated Aug 5, 2026

Memory handling in the Linux kernel dma-direct path allows attackers controlling a TDX host to compromise confidential guest memory. When dma_set_decrypted() fails, dma_direct_alloc() and dma_direct_alloc_pages() free pages that remain decrypted and shared back to the page allocator. Reachability requires a TDX guest and a host-triggered conversion failure; page reuse can expose or corrupt guest data and interrupt service.

CVSS severity9.3
Critical
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory handling in the Linux kernel dma-direct path allows attackers controlling a TDX host to compromise confidential guest memory. When dma_set_decrypted() fails, dma_direct_alloc() and dma_direct_alloc_pages() free pages that remain decrypted and shared back to the page allocator. Reachability requires a TDX guest and a host-triggered conversion failure; page reuse can expose or corrupt guest data and interrupt service.

The record

CVE
CVE-2024-35939
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

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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=56fccf21d1961a06e2a0c96ce446ebf036651062 <4031b72ca747a1e6e9ae4fa729e765b43363d66a
  2. Affected versionversion=56fccf21d1961a06e2a0c96ce446ebf036651062 <4e0cfb25d49da2e6261ad582f58ffa5b5dd8c8e9
  3. Affected versionversion=56fccf21d1961a06e2a0c96ce446ebf036651062 <b57326c96b7bc7638aa8c44e12afa2defe0c934c
  4. Affected versionversion=56fccf21d1961a06e2a0c96ce446ebf036651062 <b9fa16949d18e06bdf728a560f5c8af56d2bdcaf
  5. Affected versionversion=5.7.7 <5.8
  6. Affected versionversion=5.8
  7. Affected versionversion=91c7b0407ca6a62c095d265f76926b67bf66c026

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=56fccf21d1961a06e2a0c96ce446ebf036651062 <4031b72ca747a1e6e9ae4fa729e765b43363d66a; version=56fccf21d1961a06e2a0c96ce446ebf036651062 <4e0cfb25d49da2e6261ad582f58ffa5b5dd8c8e9; version=56fccf21d1961a06e2a0c96ce446ebf036651062 <b57326c96b7bc7638aa8c44e12afa2defe0c934c; version=56fccf21d1961a06e2a0c96ce446ebf036651062 <b9fa16949d18e06bdf728a560f5c8af56d2bdcaf; version=5.7.7 <5.8; version=5.8; version=91c7b0407ca6a62c095d265f76926b67bf66c026

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
9.3kernel.orgCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/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

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Your stack

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