CVE-2026-64122 Linux CVE debrief

Who should care

Linux kernel users and administrators, as well as security teams and vulnerability management teams, should be aware of this vulnerability and take steps to mitigate it. They should review their system configurations, update the Linux kernel to the latest version, and apply the necessary patches to prevent exploitation.

Technical summary

The vulnerability is caused by a use-after-free error in the mlx5e_tx_reporter_timeout_recover function. The function accesses sq->netdev after mlx5e_safe_reopen_channels() has torn down and freed the channel. To fix this, the three sq->netdev references should be replaced with priv->netdev, which is safe because priv outlives channel teardown. This fix prevents the KASAN splat and ensures the stability of the Linux kernel.

Defensive priority

High

Recommended defensive actions

• Update the Linux kernel to the latest version
• Apply the patch to fix the use-after-free vulnerability
• Monitor system logs for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability was reported by an unknown source and has been resolved by replacing sq->netdev with priv->netdev in the mlx5e_tx_reporter_timeout_recover function. Linux kernel users should verify their system configurations and check for any potential exploitation attempts. The fix involves updating the Linux kernel to the latest version and applying the patch to prevent use-after-free errors.

Official resources