CVE-2024-50139

Host availability loss via oversized integer shift

Published Nov 7, 2024 · Updated Aug 5, 2026

Undefined behavior in Linux KVM arm64 allows local users to cause a host-kernel availability failure during virtual CPU initialization. The reset_clidr function shifts the 32-bit integer literal 2 by CLIDR_TTYPE_SHIFT(loc), which reaches 33 bits when MTE is enabled. The path requires an arm64 host kernel with MTE support and access to KVM ioctls; the published impact is limited to availability.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Undefined behavior in Linux KVM arm64 allows local users to cause a host-kernel availability failure during virtual CPU initialization. The reset_clidr function shifts the 32-bit integer literal 2 by CLIDR_TTYPE_SHIFT(loc), which reaches 33 bits when MTE is enabled. The path requires an arm64 host kernel with MTE support and access to KVM ioctls; the published impact is limited to availability.

The record

CVE
CVE-2024-50139
Published
Nov 7, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 7, 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=6.3
  2. Affected versionversion=7af0c2534f4c57b16e92dfca8c5f40fa90fbb3f3 <04ed2ba07ce73f323052475fbd33d647aca3ff2e
  3. Affected versionversion=7af0c2534f4c57b16e92dfca8c5f40fa90fbb3f3 <4b9e11794d910aa55300debbac5f0adcc42c491a
  4. Affected versionversion=7af0c2534f4c57b16e92dfca8c5f40fa90fbb3f3 <c6c167afa090ea0451f91814e1318755a8fb8bb9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.3; version=7af0c2534f4c57b16e92dfca8c5f40fa90fbb3f3 <04ed2ba07ce73f323052475fbd33d647aca3ff2e; version=7af0c2534f4c57b16e92dfca8c5f40fa90fbb3f3 <4b9e11794d910aa55300debbac5f0adcc42c491a; version=7af0c2534f4c57b16e92dfca8c5f40fa90fbb3f3 <c6c167afa090ea0451f91814e1318755a8fb8bb9

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 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

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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