ZDI-26-683: Linux Kernel IPv6 VTI Subsystem Use-After-Free Local Privilege Escalation Vulnerability
ZDI discloses CVE-2026-72463, a CVSS 7.5 use-after-free in the Linux Kernel IPv6 VTI subsystem enabling privilege escalation.
ZDI-26-683 covers a use-after-free in the Linux Kernel IPv6 VTI subsystem that allows local attackers to escalate privileges. Exploitation requires first obtaining the ability to execute high-privileged code on the target system, limiting practical impact. ZDI assigned a CVSS rating of 7.5 and CVE-2026-72463.
- Use-after-free in Linux Kernel IPv6 VTI subsystem
- Local privilege escalation requiring pre-existing high-privileged code execution
- CVSS 7.5, tracked as CVE-2026-72463
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2026-72463 | In the Linux kernel, the following vulnerability has been resolved: In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix dev use-after-free in xfrm async resumption xfrm async resumption hold skb->dev refcnt until after transport_finish. However, xfrm_rcv_cb may modify skb->dev to tunnel dev without taking device reference, such as vti_rcv_cb. The subsequent async resumption will decrement the tunnel device's reference count, which lead to uaf of tunnel dev and refcnt leak of orig dev as below: unregister_netdevice: waiting for vti1 to become free. Usage count = -2 Stash the original skb->dev to fix refcnt imbalance. The new skb->dev set by xfrm_rcv_cb can race with device teardown. Extend rcu protection over xfrm_rcv_cb and transport_finish to prevent races. NVD description · AI analysis pending | 9.8 | <1% | — | — |
This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.5. The following CVEs are assigned: CVE-2026-72463.
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