CVE-2023-53559

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ip_vti: fix potential slab-use-after-free in decode_session6<br /> <br /> When ip_vti device is set to the qdisc of the sfb type, the cb field<br /> of the sent skb may be modified during enqueuing. Then,<br /> slab-use-after-free may occur when ip_vti device sends IPv6 packets.<br /> As commit f855691975bb ("xfrm6: Fix the nexthdr offset in<br /> _decode_session6.") showed, xfrm_decode_session was originally intended<br /> only for the receive path. IP6CB(skb)-&gt;nhoff is not set during<br /> transmission. Therefore, set the cb field in the skb to 0 before<br /> sending packets.