CVE-2021-47604

Kernel memory disclosure via unchecked VDUSE offset

Published Jun 19, 2024 · Updated Aug 5, 2026

Out-of-bounds read in Linux kernel 5.15 through 5.15.10 allows local users to disclose kernel memory or crash the host. In vduse_dev_get_config() in drivers/vdpa/vdpa_user/vduse_dev.c, an offset beyond dev->config_size underflows the unsigned size check, so memcpy reads past the configuration buffer. Exploitation requires access to a VDUSE or vhost-vdpa device node; the read can copy kernel memory to userspace or trigger a kernel oops or panic.

CVSS severity7.1
High
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

Out-of-bounds read in Linux kernel 5.15 through 5.15.10 allows local users to disclose kernel memory or crash the host. In vduse_dev_get_config() in drivers/vdpa/vdpa_user/vduse_dev.c, an offset beyond dev->config_size underflows the unsigned size check, so memcpy reads past the configuration buffer. Exploitation requires access to a VDUSE or vhost-vdpa device node; the read can copy kernel memory to userspace or trigger a kernel oops or panic.

The record

CVE
CVE-2021-47604
Published
Jun 19, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 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

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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=c8a6153b6c59d95c0e091f053f6f180952ade91e <dc1db0060c02d119fd4196924eff2d1129e9a442
  3. Affected versionversion=c8a6153b6c59d95c0e091f053f6f180952ade91e <ebbbc5fea3f648175df1aa3f127c78eb0252cc2a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=c8a6153b6c59d95c0e091f053f6f180952ade91e <dc1db0060c02d119fd4196924eff2d1129e9a442; version=c8a6153b6c59d95c0e091f053f6f180952ade91e <ebbbc5fea3f648175df1aa3f127c78eb0252cc2a

Published CVSS scores

7.1Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
5.5SUSECVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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