CVE-2026-23164 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel security, Linux kernel developers, and system administrators managing Linux-based systems should be aware of this vulnerability and assess their exposure.

Why it matters

CVE-2026-23164 is a memory leak vulnerability in the Linux kernel's rocker driver. Defenders should verify the presence of the fix, assess exposure, and apply the fix or upgrade to a patched version to prevent potential memory exhaustion and DoS attacks.

• Memory leak vulnerability can lead to memory exhaustion and potential denial-of-service (DoS) attacks
• Verification of fix presence in Linux kernel versions is required to prevent exploitation
• Exposure assessment is necessary to determine affected systems

Technical summary

The rocker_world_port_post_fini() function in the Linux kernel's rocker driver does not properly free the wpriv memory allocated for each port when the port_post_fini callback is not set. This leads to a memory leak of sizeof(struct ofdpa_port) bytes per port on every device removal. The fix involves always calling kfree(rocker_port->wpriv) regardless of whether the port_post_fini callback exists.

Defensive priority

Defenders should prioritize verifying the presence of the fix in their Linux kernel versions and assessing their exposure to this vulnerability.

Recommended defensive actions

• Verify the Linux kernel version and check if the fix is applied
• Assess exposure to this vulnerability in the Linux kernel
• Apply the fix or upgrade to a patched version
• 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 CVE record and source item provide details about the vulnerability, including its description, affected versions, and references to source code changes. The Linux kernel's rocker driver is affected by a memory leak vulnerability due to the rocker_world_port_post_fini() function not freeing the wpriv memory allocated for each port when the port_post_fini callback is not set. Defenders should verify the presence of the fix in their Linux kernel versions and assess their exposure to this vulnerability. The fix involves always calling

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.