CVE-2026-72305

Kernel-memory disclosure via uninitialized bounce pages

Published Aug 15, 2026 · Updated Aug 15, 2026

Information disclosure in Linux kernel VDUSE allows local users to read residual kernel data through mapped bounce pages. The VDUSE allocation paths in iova_domain.c and vduse_dev.c map non-page-aligned bounce buffers without first zeroing every exposed byte. A local user with access to the VDUSE userspace interface can recover stale kernel-memory contents from the exposed portions of those mappings.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Linux kernel VDUSE allows local users to read residual kernel data through mapped bounce pages. The VDUSE allocation paths in iova_domain.c and vduse_dev.c map non-page-aligned bounce buffers without first zeroing every exposed byte. A local user with access to the VDUSE userspace interface can recover stale kernel-memory contents from the exposed portions of those mappings.

The record

CVE
CVE-2026-72305
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1005
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=5.15
  2. Affected versionversion=8c773d53fb7b64267b0f55c1d3517cb8c5e29b3c <00335df9da2011e095f846d645cc2e9fd2907659
  3. Affected versionversion=8c773d53fb7b64267b0f55c1d3517cb8c5e29b3c <5e88c1bc3a41d9a260dd42bae8ad18fd4f35bbe1
  4. Affected versionversion=8c773d53fb7b64267b0f55c1d3517cb8c5e29b3c <690fb82c4122f8c2656fa4f842275132771b68b9
  5. Affected versionversion=8c773d53fb7b64267b0f55c1d3517cb8c5e29b3c <9c1523803445ee0348f62b77793266dd981596e0
  6. Affected versionversion=8c773d53fb7b64267b0f55c1d3517cb8c5e29b3c <fde25641cbddd0c084e3320d08f755e7e6acfae5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=8c773d53fb7b64267b0f55c1d3517cb8c5e29b3c <00335df9da2011e095f846d645cc2e9fd2907659; version=8c773d53fb7b64267b0f55c1d3517cb8c5e29b3c <5e88c1bc3a41d9a260dd42bae8ad18fd4f35bbe1; version=8c773d53fb7b64267b0f55c1d3517cb8c5e29b3c <690fb82c4122f8c2656fa4f842275132771b68b9; version=8c773d53fb7b64267b0f55c1d3517cb8c5e29b3c <9c1523803445ee0348f62b77793266dd981596e0; version=8c773d53fb7b64267b0f55c1d3517cb8c5e29b3c <fde25641cbddd0c084e3320d08f755e7e6acfae5

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
5.5Oracle LinuxCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
T1005Data from Local System

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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