CVE-2026-64210Network attack vector

Network service interruption via unsynchronized ICOSQ writes

Published Jul 24, 2026 · Updated Jul 24, 2026

Race condition in Linux Kernel 5.3 through 7.0.10 and 7.1-rc1 through 7.1-rc4 allows remote attackers to interrupt network service. After a NAPI affinity change, mlx5e_trigger_irq() writes and advances the synchronous ICOSQ without synchronization while XSK receive allocation or another trigger updates the queue. Reachability requires mlx5e zero-copy AF_XDP work during the affinity race; queue corruption produces bad completions and can leave receive processing unavailable.

CVSS severity7.5
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux Kernel 5.3 through 7.0.10 and 7.1-rc1 through 7.1-rc4 allows remote attackers to interrupt network service. After a NAPI affinity change, mlx5e_trigger_irq() writes and advances the synchronous ICOSQ without synchronization while XSK receive allocation or another trigger updates the queue. Reachability requires mlx5e zero-copy AF_XDP work during the affinity race; queue corruption produces bad completions and can leave receive processing unavailable.

The record

CVE
CVE-2026-64210
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 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=5.3
  2. Affected versionversion=db05815b36cbd486c86fd002dfa81c9af6245e25 <8d3b91e7d81000d295cd914d4d9d6f860252e2bf
  3. Affected versionversion=db05815b36cbd486c86fd002dfa81c9af6245e25 <c326f9c68921e2f14dfcecb2f6b4216313d50248

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.3; version=db05815b36cbd486c86fd002dfa81c9af6245e25 <8d3b91e7d81000d295cd914d4d9d6f860252e2bf; version=db05815b36cbd486c86fd002dfa81c9af6245e25 <c326f9c68921e2f14dfcecb2f6b4216313d50248

Published CVSS scores

7.5Linux kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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