CVE-2026-23010 Linux CVE debrief

Who should care

Linux kernel developers and users who rely on the Linux kernel for their systems should be aware of this vulnerability. They should review the patches provided by the Linux kernel maintainers and apply them to their systems to prevent potential exploitation.

Technical summary

The vulnerability is caused by the accidental movement of ipv6_del_addr() for mngtmpaddr before reading its ifp->flags for temporary addresses in inet6_addr_del(). To fix this, ipv6_del_addr() should be moved down. The vulnerability can be exploited by an attacker with local access to the system, allowing them to potentially execute arbitrary code. The fix involves updating the Linux kernel to a version that includes the patch.

Defensive priority

High

Recommended defensive actions

• Apply the patches provided by the Linux kernel maintainers
• Update the Linux kernel to a version that includes the fix
• Monitor the system for any suspicious activity
• Use a supported and maintained Linux kernel 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

Evidence notes

The vulnerability was reported by syzbot and was resolved by moving ipv6_del_addr() down to fix the use-after-free error. The fix is available in the Linux kernel stable branches. Further verification is recommended to confirm affected deployments and ensure proper mitigation.

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.