CVE-2022-49186

Out-of-bounds kernel access via unsigned reset sentinel

Published Feb 26, 2025 · Updated May 11, 2026

An array-index flaw in the Visconti clock driver in Linux 5.17 and 5.17.1 allows local users to access kernel memory out of bounds. The rs_id field stores the no-reset sentinel -1 in an unsigned byte, making the nonnegative check always true before reset-array indexing. Reachability requires a Visconti platform using the affected clock driver; the published record identifies no user-controlled trigger or demonstrated end effect.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An array-index flaw in the Visconti clock driver in Linux 5.17 and 5.17.1 allows local users to access kernel memory out of bounds. The rs_id field stores the no-reset sentinel -1 in an unsigned byte, making the nonnegative check always true before reset-array indexing. Reachability requires a Visconti platform using the affected clock driver; the published record identifies no user-controlled trigger or demonstrated end effect.

The record

CVE
CVE-2022-49186
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-129
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.17
  2. Affected versionversion=b4cbe606dc3674b25cb661e7cd1a1c6ddaaafaaa <2723543c1d60278d5aef1c4ad732dbad24b84a81
  3. Affected versionversion=b4cbe606dc3674b25cb661e7cd1a1c6ddaaafaaa <c5601e0720ce1a3ad895f94a5838530edde01ed3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.17; version=b4cbe606dc3674b25cb661e7cd1a1c6ddaaafaaa <2723543c1d60278d5aef1c4ad732dbad24b84a81; version=b4cbe606dc3674b25cb661e7cd1a1c6ddaaafaaa <c5601e0720ce1a3ad895f94a5838530edde01ed3

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-129Improper Validation of Array Index

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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