CVE-2023-3268

Crash and information disclosure via relayfs read race

Published Jun 16, 2023 · Updated Aug 24, 2026

Out-of-bounds read in Linux Kernel relayfs allows local users to crash affected systems or expose kernel memory through a local read. During concurrent relay-buffer activity, relay_file_read_start_pos fails to wrap an end-of-buffer position and relay_file_read copies from an invalid address. A low-privileged local account and precisely timed relay-buffer activity are required; no integrity impact is reported.

CVSS severity7.1
High
EPSS probability0.48%
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 relayfs allows local users to crash affected systems or expose kernel memory through a local read. During concurrent relay-buffer activity, relay_file_read_start_pos fails to wrap an end-of-buffer position and relay_file_read copies from an invalid address. A low-privileged local account and precisely timed relay-buffer activity are required; no integrity impact is reported.

The record

CVE
CVE-2023-3268
Published
Jun 16, 2023
Updated
Aug 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 24, 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=2.6.22 <4.19.283
  2. Affected versionversion=4.20 <5.4.243
  3. Affected versionversion=5.11 <5.15.111
  4. Affected versionversion=5.16 <6.1.28
  5. Affected versionversion=5.5 <5.10.180
  6. Affected versionversion=6.2 <6.2.15
  7. Affected versionversion=6.3 <6.3.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.22 <4.19.283; version=4.20 <5.4.243; version=5.11 <5.15.111; version=5.16 <6.1.28; version=5.5 <5.10.180; version=6.2 <6.2.15; version=6.3 <6.3.2

Published CVSS scores

6.0OracleCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H
7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

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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