CVE-2026-72293

Host hang via unpreloaded radix-tree insertion

Published Aug 15, 2026 · Updated Aug 15, 2026

Denial of service in Linux kernel 7.0 KVM s390 vsie allows local users to make the host unresponsive through a shadow fault. The _gaccess_shadow_fault() path attempts radix-tree insertion without preloading allocation resources before taking its lock, so allocation failure prevents forward progress. Low-privilege local access and an s390 host using the KVM vsie path are required; the supported consequence is a host hang.

CVSS severity5.5
Medium
EPSS probability0.19%
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 7.0 KVM s390 vsie allows local users to make the host unresponsive through a shadow fault. The _gaccess_shadow_fault() path attempts radix-tree insertion without preloading allocation resources before taking its lock, so allocation failure prevents forward progress. Low-privilege local access and an s390 host using the KVM vsie path are required; the supported consequence is a host hang.

The record

CVE
CVE-2026-72293
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-909, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=7.0
  2. Affected versionversion=e38c884df92119d96f652d51f82661dd2fc0b885 <0c3d4ca328e661cb4eda3bb344ea17e4b6a63171
  3. Affected versionversion=e38c884df92119d96f652d51f82661dd2fc0b885 <668e70cc545e2659f3c4adad20a0883533042473

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=7.0; version=e38c884df92119d96f652d51f82661dd2fc0b885 <0c3d4ca328e661cb4eda3bb344ea17e4b6a63171; version=e38c884df92119d96f652d51f82661dd2fc0b885 <668e70cc545e2659f3c4adad20a0883533042473

Published CVSS scores

5.5Red HatCVSS: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

CWE-909Missing Initialization of Resource
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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