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CVE-2026-64122

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover mlx5e_tx_reporter_timeout_recover() accesses sq->netdev afte…

Published Jul 19, 2026CWE-416EPSS 0.63%

Overview

CVE-2026-64122 is a critical-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover

mlx5e_tx_reporter_timeout_recover() accesses sq->netdev after

mlx5e_safe_reopen_channels() has torn down and freed the channel (and

its embedded SQs). Replace the three sq->netdev references with

priv->netdev which is safe because priv outlives channel teardown.

The netdev_err() call already used priv->netdev for this reason; make

the trylock/unlock and health_channel_eq_recover calls consistent.

This fixes the following KASAN splat:

BUG: KASAN: use-after-free in mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]

Read of size 8 at addr ffff889860ed0b28 by task kworker/u113:2/5277

Call Trace:

mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]

devlink_health_reporter_recover+0xa2/0x150

devlink_health_report+0x254/0x7c0

mlx5e_reporter_tx_timeout+0x297/0x380 [mlx5_core]

mlx5e_tx_timeout_work+0x109/0x170 [mlx5_core]

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/152295aa7dc2c5e046606f7dadc84fce41136446Refgit.kernel.org/stable/c/1604a2d68414aa4cc34faac0b7faa9c14455e8d3Refgit.kernel.org/stable/c/7d260c5d2d89eb2c8c528d54b576b3aae3e20231

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64122?

CVE-2026-64122 is a critical-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-64122?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-64122?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-64122?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64122 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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