CVE-2026-64006

Packet-filter misbehavior via overlapping register shifts

Published Jul 19, 2026 · Updated Jul 19, 2026

Incorrect register handling in Linux Kernel allows attackers to corrupt nf_tables shift results via crafted rule bytecode. The lshift and rshift loops write each output word before reading the same source word for the next carry when source and destination overlap. Reachability requires submitting nf_tables control-plane rules, while the public record identifies no consequence beyond incorrect packet-filter evaluation.

CVSS severityUnavailable
Unscored
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

Incorrect register handling in Linux Kernel allows attackers to corrupt nf_tables shift results via crafted rule bytecode. The lshift and rshift loops write each output word before reading the same source word for the next carry when source and destination overlap. Reachability requires submitting nf_tables control-plane rules, while the public record identifies no consequence beyond incorrect packet-filter evaluation.

The record

CVE
CVE-2026-64006
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1562.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=5.6
  2. Affected versionversion=567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <18014147d3ee7831dce53fe65d7fc8d428b02552
  3. Affected versionversion=567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <96bea2a7baac4a1137c188dc7610184487ab30a7
  4. Affected versionversion=567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <a391afe74398b70107f111aa731eab608624949d
  5. Affected versionversion=567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <b80ef316e978de2ef81d5bee9c19800b4cf96fb8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.6; version=567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <18014147d3ee7831dce53fe65d7fc8d428b02552; version=567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <96bea2a7baac4a1137c188dc7610184487ab30a7; version=567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <a391afe74398b70107f111aa731eab608624949d; version=567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <b80ef316e978de2ef81d5bee9c19800b4cf96fb8

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1562.004Impair Defenses: Disable or Modify System Firewall

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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