CVE-2026-68121
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
pppoe: reload header pointer after dev_hard_header()
pppoe_sendmsg() saves a pointer to the PPPoE header before calling
dev_hard_header(). Device header callbacks are allowed to reallocate the
skb head, invalidating pointers into it.
This can happen when a send is blocked in copy_from_user() while the first
non-Ethernet port is added to an empty team device. The team's delegated
GRE header callback then expands the skb head. PPPoE subsequently writes
six bytes through the stale pointer into the freed head.
Reload the PPPoE header through the skb's network-header offset after
device header creation. pskb_expand_head() updates that offset when it
relocates the head.
https://git.kernel.org/stable/c/6866abf59976d273164a6624234d96a967280223
https://git.kernel.org/stable/c/7e9fbd7f96bcde63a7c798fe16b38cedee7a1501
https://git.kernel.org/stable/c/bed4caecd723693f750e13adbb2c42ca1249a3fd
https://git.kernel.org/stable/c/e6493a4d1ee17595766165fa446d45b7e0c318d0
https://git.kernel.org/stable/c/e9c238f6fe42fb1b4dba3a578277de32cb487937