In the Linux kernel, the following vulnerability has been resolved:
netfilter: ip6t_eui64: reject invalid MAC header for all packets
eui64_mt6() derives a modified EUI-64 from the Ethernet source address
and compares it with the low 64 bits of the IPv6 source address.
The existing guard only rejects an invalid MAC header when
par->fragoff != 0. For packets with par->fragoff == 0, eui64_mt6()
can still reach eth_hdr(skb) even when the MAC header is not valid.
Fix this by removing the par->fragoff != 0 condition so that packets
with an invalid MAC header are rejected before accessing eth_hdr(skb).
Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:HI:LA:H9.4/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H