CVE-2023-3397

Crash and kernel disclosure via JFS log race

Published Nov 1, 2023 · Updated Nov 20, 2025

Use-after-free in Linux kernel JFS 6.3.0 allows local users to crash the system or read internal kernel information via a race. During JFS teardown, lmLogClose clears and frees the superblock's log object while txEnd can retain that pointer and clear log_FLUSH through freed memory. Normal local privileges are sufficient, but exploitation depends on winning the cross-thread timing window; the documented results are a kernel crash or disclosure of internal kernel information.

CVSS severity7.0
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

Use-after-free in Linux kernel JFS 6.3.0 allows local users to crash the system or read internal kernel information via a race. During JFS teardown, lmLogClose clears and frees the superblock's log object while txEnd can retain that pointer and clear log_FLUSH through freed memory. Normal local privileges are sufficient, but exploitation depends on winning the cross-thread timing window; the documented results are a kernel crash or disclosure of internal kernel information.

The record

CVE
CVE-2023-3397
Published
Nov 1, 2023
Updated
Nov 20, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.0Red Hat, Inc.CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
6.3NIST NVDCVSS:3.1/AV:L/AC:H/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 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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416Use After Free
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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