CVE-2026-31592Public exploit

Host crash via unlocked SEV region registration

Published Apr 24, 2026 · Updated Apr 24, 2026

NULL pointer dereference in Linux Kernel KVM SEV allows local users to crash the host through concurrent KVM ioctl operations. sev_mem_enc_register_region() checks sev_guest() without holding kvm->lock, so a failed KVM_SEV_INIT operation can race region registration and append to an uninitialized sev->regions_list. Access to the KVM device and SEV support are required; successful triggering causes a general-protection fault and host-kernel crash.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux Kernel KVM SEV allows local users to crash the host through concurrent KVM ioctl operations. sev_mem_enc_register_region() checks sev_guest() without holding kvm->lock, so a failed KVM_SEV_INIT operation can race region registration and append to an uninitialized sev->regions_list. Access to the KVM device and SEV support are required; successful triggering causes a general-protection fault and host-kernel crash.

The record

CVE
CVE-2026-31592
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0ff93ff0ba82e9511770e175fa50682a1ab14fb6
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35a0963d361f98bba798fd15d229dcb166c04684
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ab725ac3022469ecd4d7aa7d5646712e98b249d8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0ff93ff0ba82e9511770e175fa50682a1ab14fb6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35a0963d361f98bba798fd15d229dcb166c04684; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ab725ac3022469ecd4d7aa7d5646712e98b249d8

Published CVSS scores

5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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 exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

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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