CVE-2026-74391

Kernel memory corruption via unbounded synthetic-field concatenation

Published Aug 15, 2026 · Updated Aug 15, 2026

Buffer overflow in Linux kernel tracing allows local users with elevated privileges to corrupt memory through oversized synthetic-field inputs. Synthetic-field helpers append long key lists, field names, or saved filters with raw strcat into fixed MAX_FILTER_STR_VAL staging buffers. Tracing-control privileges are required, and successful triggering overruns memory used while constructing a synthetic variable name or histogram command.

CVSS severity6.0
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Linux kernel tracing allows local users with elevated privileges to corrupt memory through oversized synthetic-field inputs. Synthetic-field helpers append long key lists, field names, or saved filters with raw strcat into fixed MAX_FILTER_STR_VAL staging buffers. Tracing-control privileges are required, and successful triggering overruns memory used while constructing a synthetic variable name or histogram command.

The record

CVE
CVE-2026-74391
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=02205a6752f223779a1b0e9e8ffacbea6e717851 <0c584c27f6649a93ec12061cc779a4bd8f7c1434
  2. Affected versionversion=02205a6752f223779a1b0e9e8ffacbea6e717851 <88b901fdc1662b131ff908cbd017333b61e7acc8
  3. Affected versionversion=02205a6752f223779a1b0e9e8ffacbea6e717851 <baa333b2700a7fa3529d504529c8c10060fd687c
  4. Affected versionversion=02205a6752f223779a1b0e9e8ffacbea6e717851 <cf334620036ad2250e008c7e7bb6646a3938b7b0
  5. Affected versionversion=02205a6752f223779a1b0e9e8ffacbea6e717851 <f07883450eb14d1cf020b55d9f3a7ec5683bcd26
  6. Affected versionversion=4.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=02205a6752f223779a1b0e9e8ffacbea6e717851 <0c584c27f6649a93ec12061cc779a4bd8f7c1434; version=02205a6752f223779a1b0e9e8ffacbea6e717851 <88b901fdc1662b131ff908cbd017333b61e7acc8; version=02205a6752f223779a1b0e9e8ffacbea6e717851 <baa333b2700a7fa3529d504529c8c10060fd687c; version=02205a6752f223779a1b0e9e8ffacbea6e717851 <cf334620036ad2250e008c7e7bb6646a3938b7b0; version=02205a6752f223779a1b0e9e8ffacbea6e717851 <f07883450eb14d1cf020b55d9f3a7ec5683bcd26; version=4.17

Published CVSS scores

6.0Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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