Is there a patch available for CVE-2026-74391?

Yes, a patch is available for CVE-2026-74391. Update the affected software to the latest version immediately.

Linux CVE-2026-74391

EUVD-2026-59538

2026-08-15 Linux

GHSA-853c-pg29-mfgr

Information Disclosure Linux

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Awaiting Data No severity or threat signals available yet. Label will update when CVSS score is published or threat intelligence arrives. Why: No CVSS yet + weak signal (CWE or non-zero EPSS).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisCVE.org

In the Linux kernel, the following vulnerability has been resolved:

tracing: Bound synthetic-field strings with seq_buf

The synthetic field helpers build a prefixed synthetic variable name and a generated hist command in fixed MAX_FILTER_STR_VAL buffers. The current code appends those strings with raw strcat(), so long key lists, field names, or saved filters can run past the end of the staging buffers.

Build both strings with seq_buf and propagate -E2BIG if either the synthetic variable name or the generated command exceeds MAX_FILTER_STR_VAL. This keeps the existing tracing-side limit while using the helper intended for bounded command construction.

[ sdr: Moved struct seq_buf *s for upside-down x-mas tree formatting ]

Affected VersionsENISA

Linux 02205a6752f223779a1b0e9e8ffacbea6e717851 <cf334620036ad2250e008c7e7bb6646a3938b7b0

Linux patch: 7.2-rc1

Linux patch: 6.18.40

Linux patch: 6.12.97

Linux 02205a6752f223779a1b0e9e8ffacbea6e717851 <baa333b2700a7fa3529d504529c8c10060fd687c

Linux patch: 7.1.5

Linux patch: 0

Linux 02205a6752f223779a1b0e9e8ffacbea6e717851 <88b901fdc1662b131ff908cbd017333b61e7acc8

Linux patch: 6.6.145

Linux 02205a6752f223779a1b0e9e8ffacbea6e717851 <0c584c27f6649a93ec12061cc779a4bd8f7c1434

Linux 4.17

Linux 02205a6752f223779a1b0e9e8ffacbea6e717851 <f07883450eb14d1cf020b55d9f3a7ec5683bcd26

Affected Packages

euvd linux no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Exploit and PoC references, threat intelligence from 22 sources

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Lifecycle Timeline

Patch available

Aug 15, 2026 - 07:19 EUVD

CVE Published

Aug 15, 2026 - 05:59 cve.org

UNKNOWN (no severity yet)

Threat Intelligence Overview

EPSS Score

0.2%

Top 93% exploitable

Data Quality

1 sources

Confidence: Low

EUVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity Not scored yet

CISA KEV No

Public POC No

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

No CVSS yet + weak signal (CWE or non-zero EPSS)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.