CVE-2026-64024Network attack vector

Blind TCP injection via stale per-CPU ISN

Published Jul 19, 2026 · Updated Jul 19, 2026

Predictable TCP ISNs in Linux Kernel 6.10 through 6.18.33 and 6.19 through 7.0.10 allow remote attackers to inject TCP data. Packet-drop paths leave a TIME_WAIT-derived tcp_tw_isn value in per-CPU storage, and tcp_conn_request reuses it for the next SYN on that CPU. Exploitation requires steering the trigger packet and subsequent SYN to the same CPU; successful prediction supports blind session injection.

CVSS severity9.4
Critical
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Predictable TCP ISNs in Linux Kernel 6.10 through 6.18.33 and 6.19 through 7.0.10 allow remote attackers to inject TCP data. Packet-drop paths leave a TIME_WAIT-derived tcp_tw_isn value in per-CPU storage, and tcp_conn_request reuses it for the next SYN on that CPU. Exploitation requires steering the trigger packet and subsequent SYN to the same CPU; successful prediction supports blind session injection.

The record

CVE
CVE-2026-64024
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1563
Attack vector
network
Privileges
unauthenticated

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=41eecbd712b73f0d5dcf1152b9a1c27b1f238028 <1bbf0ced1d9db73ac7893c2187f3459288603e0d
  2. Affected versionversion=41eecbd712b73f0d5dcf1152b9a1c27b1f238028 <4affe063fa56c880cbea8d0bfded0bb80751579d
  3. Affected versionversion=41eecbd712b73f0d5dcf1152b9a1c27b1f238028 <e47f7060eaf60894e3e4d0e3c4fe6e1f2eacfbdd
  4. Affected versionversion=6.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=41eecbd712b73f0d5dcf1152b9a1c27b1f238028 <1bbf0ced1d9db73ac7893c2187f3459288603e0d; version=41eecbd712b73f0d5dcf1152b9a1c27b1f238028 <4affe063fa56c880cbea8d0bfded0bb80751579d; version=41eecbd712b73f0d5dcf1152b9a1c27b1f238028 <e47f7060eaf60894e3e4d0e3c4fe6e1f2eacfbdd; version=6.10

Published CVSS scores

9.4kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1563Remote Service Session Hijacking

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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