CVE-2026-74713

Host denial of service via unbounded IOTLB allocation

Published Aug 22, 2026 · Updated Aug 25, 2026

Resource exhaustion in the vhost IOTLB subsystem in affected Linux kernels allows local users or guest OS users to crash the host. vhost_iotlb_add_range_ctx() lets non-retiring tables keep allocating map entries after their configured limit instead of returning -ENOSPC. Reachability requires access to a vhost device node or a guest that can drive virtio IOTLB misses; the flaw exhausts host kernel memory without reading or modifying data.

CVSS severity7.1
High
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

Resource exhaustion in the vhost IOTLB subsystem in affected Linux kernels allows local users or guest OS users to crash the host. vhost_iotlb_add_range_ctx() lets non-retiring tables keep allocating map entries after their configured limit instead of returning -ENOSPC. Reachability requires access to a vhost device node or a guest that can drive virtio IOTLB misses; the flaw exhausts host kernel memory without reading or modifying data.

The record

CVE
CVE-2026-74713
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-770, T1499.004
Attack vector
local
Privileges
unauthenticated

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=0bbe30668d89ec8a309f28ced6d092c90fb23e8c <1ed35ac7f3fe2b4396bdd29ac3a7f0ebc0829e94
  2. Affected versionversion=0bbe30668d89ec8a309f28ced6d092c90fb23e8c <ae128dd19040ee06a4f8143c7ced4d18080d7a9a
  3. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0bbe30668d89ec8a309f28ced6d092c90fb23e8c <1ed35ac7f3fe2b4396bdd29ac3a7f0ebc0829e94; version=0bbe30668d89ec8a309f28ced6d092c90fb23e8c <ae128dd19040ee06a4f8143c7ced4d18080d7a9a; version=5.7

Published CVSS scores

7.1LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application 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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