CVE-2026-64122Network attack vector

Kernel fault via stale TX queue reference

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in the Linux kernel mlx5e TX recovery path allows remote attackers to trigger memory corruption through a TX timeout. mlx5e_tx_reporter_timeout_recover dereferences sq->netdev after mlx5e_safe_reopen_channels frees the channel and its embedded send queues. Reachability requires an mlx5e interface and the TX-timeout recovery path; the published failure is an invalid eight-byte read and KASAN fault.

CVSS severity9.8
Critical
EPSS probability0.46%
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 the Linux kernel mlx5e TX recovery path allows remote attackers to trigger memory corruption through a TX timeout. mlx5e_tx_reporter_timeout_recover dereferences sq->netdev after mlx5e_safe_reopen_channels frees the channel and its embedded send queues. Reachability requires an mlx5e interface and the TX-timeout recovery path; the published failure is an invalid eight-byte read and KASAN fault.

The record

CVE
CVE-2026-64122
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499.004
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=4329514c61abefe4961541b128c549b017bab5ad <1604a2d68414aa4cc34faac0b7faa9c14455e8d3
  2. Affected versionversion=6.18.14 <6.18.34
  3. Affected versionversion=6.19.4 <6.20
  4. Affected versionversion=63f9d5fb4d8040077df801ca3270e2f02d55e0d9
  5. Affected versionversion=7.0
  6. Affected versionversion=83ac0304a2d77519dae1e54c9713cbe1aedf19c9 <152295aa7dc2c5e046606f7dadc84fce41136446
  7. Affected versionversion=83ac0304a2d77519dae1e54c9713cbe1aedf19c9 <7d260c5d2d89eb2c8c528d54b576b3aae3e20231

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4329514c61abefe4961541b128c549b017bab5ad <1604a2d68414aa4cc34faac0b7faa9c14455e8d3; version=6.18.14 <6.18.34; version=6.19.4 <6.20; version=63f9d5fb4d8040077df801ca3270e2f02d55e0d9; version=7.0; version=83ac0304a2d77519dae1e54c9713cbe1aedf19c9 <152295aa7dc2c5e046606f7dadc84fce41136446; version=83ac0304a2d77519dae1e54c9713cbe1aedf19c9 <7d260c5d2d89eb2c8c528d54b576b3aae3e20231

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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 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

CWE-416Use After Free
T1499.004Application 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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