CVE-2026-31590Public exploit

Local denial of service via oversized SEV region

Published Apr 24, 2026 · Updated Apr 24, 2026

Denial of service in Linux Kernel KVM SEV allows local users to interrupt host service via an oversized encrypted-memory region. The sev_pin_memory() path derives a page count from the user-controlled 64-bit size and invokes WARN when that count exceeds the int range. Reachability requires access to a KVM SEV virtual-machine descriptor, and host interruption requires warning handling configured to panic.

CVSS severity5.5
Medium
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

Denial of service in Linux Kernel KVM SEV allows local users to interrupt host service via an oversized encrypted-memory region. The sev_pin_memory() path derives a page count from the user-controlled 64-bit size and invokes WARN when that count exceeds the int range. Reachability requires access to a KVM SEV virtual-machine descriptor, and host interruption requires warning handling configured to panic.

The record

CVE
CVE-2026-31590
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
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

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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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1cba4dcd795daf6d257122779fb6a349edf03914
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28cc13ca20431b127d42d84ba10898d03e2c8267
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ab423e5892826202a660b5ac85d1125b0e8301a5
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c29ff288a2d97a6f4640a498a367cf0eb91312eb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1cba4dcd795daf6d257122779fb6a349edf03914; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28cc13ca20431b127d42d84ba10898d03e2c8267; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ab423e5892826202a660b5ac85d1125b0e8301a5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c29ff288a2d97a6f4640a498a367cf0eb91312eb

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.

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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

T1499Endpoint Denial of Service

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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