CVE-2026-23335 Linux CVE debrief

Who should care

Linux kernel users and administrators should be aware of this vulnerability and take necessary actions to mitigate it. This vulnerability can potentially be used to leak sensitive information from the kernel stack. Defenders should review Linux kernel configurations and monitor system logs for potential exploitation attempts.

Technical summary

The vulnerability is caused by a kernel stack leak in the irdma_create_user_ah() function. The struct irdma_create_ah_resp has a reserved member rsvd[4] which is not zeroed, resulting in 4 bytes of stack memory being leaked unconditionally. Only ah_id is assigned before ib_respond_udata(). This vulnerability affects Linux kernel users and administrators. Defenders should review Linux kernel configurations and monitor system logs for potential exploitation attempts.

Defensive priority

Apply patches or updates provided by the Linux kernel maintainers to fix the vulnerability.

Recommended defensive actions

• Apply patches or updates provided by the Linux kernel maintainers to fix the vulnerability.
• Review and update Linux kernel configurations to ensure that RDMA/irdma is properly configured.
• Monitor kernel 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 CVE record was published on 2026-03-25T11:16:31.050Z and was last modified on 2026-07-14T13:18:30.113Z. The NVD entry is currently Modified. This vulnerability affects Linux kernel users and administrators. Evidence of exploitation is not yet available. Defenders should verify Linux kernel configurations and review system logs for potential exploitation attempts.

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.