CVE-2026-68302

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

amt: re-read skb header pointers after every pull

Several AMT receive and transmit paths cache a pointer into the skb head

(ip_hdr(), ipv6_hdr(), eth_hdr() or the AMT message header) and then call

a helper that can reallocate that head before the cached pointer is used

again. pskb_may_pull(), ip_mc_may_pull(), ipv6_mc_may_pull(),

iptunnel_pull_header(), ip_mc_check_igmp() and ipv6_mc_check_mld() can all

free the old head and move the data, so a pointer taken before the call

dangles afterwards and the later access is a use-after-free of the freed

head.

The affected sites are:

amt_rcv() caches ip_hdr() before amt_parse_type() pulls, then reads

iph->saddr.

amt_dev_xmit() caches ip_hdr()/ipv6_hdr() before ip_mc_check_igmp()/

ipv6_mc_check_mld() and pskb_may_pull(), then reads the group address.

amt_multicast_data_handler() caches eth_hdr() before pskb_may_pull(),

then writes the L2 header.

amt_members

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References