CVE-2026-74607

Host compromise via SEV context races

Published Aug 22, 2026 · Updated Aug 25, 2026

Race conditions in KVM SVM allow local users with KVM access to compromise the host through concurrent SEV context ioctls. The sev_migrate_from() path moves a mirror onto the owner's mirror_vms list without the owner lock, while sev_vm_destroy() can release the wrong KVM after enc_context_owner changes. Access to /dev/kvm and AMD SEV setup is required; concurrent MOVE, COPY, and destroy operations can corrupt kernel lists, mismanage object lifetimes, and crash or compromise the host.

CVSS severity8.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race conditions in KVM SVM allow local users with KVM access to compromise the host through concurrent SEV context ioctls. The sev_migrate_from() path moves a mirror onto the owner's mirror_vms list without the owner lock, while sev_vm_destroy() can release the wrong KVM after enc_context_owner changes. Access to /dev/kvm and AMD SEV setup is required; concurrent MOVE, COPY, and destroy operations can corrupt kernel lists, mismanage object lifetimes, and crash or compromise the host.

The record

CVE
CVE-2026-74607
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-366, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=5.18
  2. Affected versionversion=b2125513dfc0dd0ec5a9605138a3c356592cfb73 <1d78d33275ef2a16c6d080910b291d0a97a0e613
  3. Affected versionversion=b2125513dfc0dd0ec5a9605138a3c356592cfb73 <28afde1edbd8b20058cbf4d75fb57876471ec334
  4. Affected versionversion=b2125513dfc0dd0ec5a9605138a3c356592cfb73 <328ab4fabe05af004d886659f8744076e320ddce
  5. Affected versionversion=b2125513dfc0dd0ec5a9605138a3c356592cfb73 <47976eaaf0a4eb46dade48b3246779090db9e3ec
  6. Affected versionversion=b2125513dfc0dd0ec5a9605138a3c356592cfb73 <7943ec3a6d0e7e0a2eb4943300bce089ac3e8c3e
  7. Affected versionversion=b2125513dfc0dd0ec5a9605138a3c356592cfb73 <d728baba0f20e49439fc7831bf3e4e7dee82161a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=b2125513dfc0dd0ec5a9605138a3c356592cfb73 <1d78d33275ef2a16c6d080910b291d0a97a0e613; version=b2125513dfc0dd0ec5a9605138a3c356592cfb73 <28afde1edbd8b20058cbf4d75fb57876471ec334; version=b2125513dfc0dd0ec5a9605138a3c356592cfb73 <328ab4fabe05af004d886659f8744076e320ddce; version=b2125513dfc0dd0ec5a9605138a3c356592cfb73 <47976eaaf0a4eb46dade48b3246779090db9e3ec; version=b2125513dfc0dd0ec5a9605138a3c356592cfb73 <7943ec3a6d0e7e0a2eb4943300bce089ac3e8c3e; version=b2125513dfc0dd0ec5a9605138a3c356592cfb73 <d728baba0f20e49439fc7831bf3e4e7dee82161a

Published CVSS scores

8.8Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:L/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.

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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

CWE-366Race Condition within a Thread
T1068Exploitation for Privilege Escalation

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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