CVE-2023-53553

Local service interruption in Hyper-V HID handling

Published Oct 4, 2025 · Updated Oct 4, 2025

Bounds-checking issue in Linux 6.2 through 6.4.4 allows local users to interrupt service via Hyper-V synthetic HID messages. The mousevsc_on_receive path copies a protocol response using a host-supplied size, although an existing upper-bound check rejects oversized messages and the patch only rewrites that check for GCC. Exposure requires a Linux guest using the Hyper-V synthetic HID path; the public record does not demonstrate a runtime bypass of the existing check.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Bounds-checking issue in Linux 6.2 through 6.4.4 allows local users to interrupt service via Hyper-V synthetic HID messages. The mousevsc_on_receive path copies a protocol response using a host-supplied size, although an existing upper-bound check rejects oversized messages and the patch only rewrites that check for GCC. Exposure requires a Linux guest using the Hyper-V synthetic HID path; the public record does not demonstrate a runtime bypass of the existing check.

The record

CVE
CVE-2023-53553
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 2025Record 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=542f25a94471570e2594be5b422b9ca572cf88a1 <5f151364b1da6bd217632fd4ee8cc24eaf66a497
  2. Affected versionversion=542f25a94471570e2594be5b422b9ca572cf88a1 <a7902cc5f5b9c95997017c8e309da760fb1deb6e
  3. Affected versionversion=6.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=542f25a94471570e2594be5b422b9ca572cf88a1 <5f151364b1da6bd217632fd4ee8cc24eaf66a497; version=542f25a94471570e2594be5b422b9ca572cf88a1 <a7902cc5f5b9c95997017c8e309da760fb1deb6e; version=6.2

Published CVSS scores

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 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

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

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Your stack

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