CVE-2026-64082 Linux CVE debrief

Who should care

Linux kernel users and maintainers, as well as security teams and operators responsible for managing and maintaining Linux-based systems, should be aware of this vulnerability and take necessary actions to ensure their systems are updated with the patched kernel. This vulnerability could potentially be used to gain unauthorized access to sensitive information or disrupt system operations.

Technical summary

The vulnerability is caused by the unconditional call to cregs_to_regs() in compat_riscv_gpr_set() and compat_restore_sigcontext(). This leads to the corruption of the target task's pt_regs and potentially leaks kernel stack contents. The issue has been resolved by only calling cregs_to_regs() when the user copy succeeds. This vulnerability affects the Linux kernel and could potentially allow an attacker to corrupt the register state of a target task or leak kernel stack contents.

Defensive priority

High

Recommended defensive actions

• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Monitor system logs for potential exploitation attempts.

Evidence notes

The CVE record was published on 2026-07-19T16:17:48.807Z and has not been modified since then. The NVD entry is currently Received. There is limited information available about this vulnerability, and further verification is needed to determine its impact. Defenders should review the official CVE record and NVD entry for more information.

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.