CVE-2026-74347

Kernel memory corruption via stale timeout reference

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in Linux kernel netfilter connection timeouts allows local users to corrupt kernel memory through a stale policy reference. Control-plane deletion can release an nf_ct_timeout object while a conntrack extension or queued packet still retains it because the old reference count does not track dataplane use. Exploitation requires low-privileged local access and custom conntrack timeouts; corruption can compromise confidentiality, integrity, and availability.

CVSS severity7.8
High
EPSS probability0.12%
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 netfilter connection timeouts allows local users to corrupt kernel memory through a stale policy reference. Control-plane deletion can release an nf_ct_timeout object while a conntrack extension or queued packet still retains it because the old reference count does not track dataplane use. Exploitation requires low-privileged local access and custom conntrack timeouts; corruption can compromise confidentiality, integrity, and availability.

The record

CVE
CVE-2026-74347
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-398, T1068
Attack vector
local
Privileges
authenticated

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=3.4
  2. Affected versionversion=50978462300f74dc48aea4a38471cb69bdf741a5 <7d6a9cdb8d3a51d9cfe546a09a518ab3d2671549
  3. Affected versionversion=50978462300f74dc48aea4a38471cb69bdf741a5 <9aeb0dcfeb460d33d61d434148b51103ab1d2013

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.4; version=50978462300f74dc48aea4a38471cb69bdf741a5 <7d6a9cdb8d3a51d9cfe546a09a518ab3d2671549; version=50978462300f74dc48aea4a38471cb69bdf741a5 <9aeb0dcfeb460d33d61d434148b51103ab1d2013

Published CVSS scores

7.8UbuntuCVSS: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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-398Indicator of Poor Code Quality
T1068Exploitation for Privilege Escalation

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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