CVE-2025-38441netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto()

Official description

In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto() syzbot found a potential access to uninit-value in nf_flow_pppoe_proto() Blamed commit forgot the Ethernet header. BUG: KMSAN: uninit-value in nf_flow_offload_inet_hook+0x7e4/0x940 net/netfilter/nf_flow_table_inet.c:27 nf_flow_offload_inet_hook+0x7e4/0x940 net/netfilter/nf_flow_table_inet.c:27 nf_hook_entry_hookfn include/linux/netfilter.h:157 [inline] nf_hook_slow+0xe1/0x3d0 net/netfilter/core.c:623 nf_hook_ingress include/linux/netfilter_netdev.h:34 [inline] nf_ingress net/core/dev.c:5742 [inline] __netif_receive_skb_core+0x4aff/0x70c0 net/core/dev.c:5837 __netif_receive_skb_one_core net/core/dev.c:5975 [inline] __netif_receive_skb+0xcc/0xac0 net/core/dev.c:6090 netif_receive_skb_internal net/core/dev.c:6176 [inline] netif_receive_skb+0x57/0x630 net/core/dev.c:6235 tun_rx_batched+0x1df/0x980 drivers/net/tun.c:1485 tun_get_user+0x4ee0/0x6b40 drivers/net/tun.c:1938 tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1984 new_sync_write fs/read_write.c:593 [inline] vfs_write+0xb4b/0x1580 fs/read_write.c:686 ksys_write fs/read_write.c:738 [inline] __do_sys_write fs/read_write.c:749 [inline]

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/a3aea97d55964e70a1e6426aa4cafdc036e8a2dd
• https://git.kernel.org/stable/c/eed8960b289327235185b7c32649c3470a3e969b
• https://git.kernel.org/stable/c/9fbc49429a23b02595ba82536c5ea425fdabb221
• https://git.kernel.org/stable/c/e0dd2e9729660f3f4fcb16e0aef87342911528ef
• https://git.kernel.org/stable/c/cfbf0665969af2c69d10c377d4c3d306e717efb4
• https://git.kernel.org/stable/c/18cdb3d982da8976b28d57691eb256ec5688fad2
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html