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linux/net
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Yochai Eisenrich 42cfd7898e net: fix fanout UAF in packet_release() via NETDEV_UP race 
[ Upstream commit 42156f93d1 ]

`packet_release()` has a race window where `NETDEV_UP` can re-register a
socket into a fanout group's `arr[]` array. The re-registration is not
cleaned up by `fanout_release()`, leaving a dangling pointer in the fanout
array.
`packet_release()` does NOT zero `po->num` in its `bind_lock` section.
After releasing `bind_lock`, `po->num` is still non-zero and `po->ifindex`
still matches the bound device. A concurrent `packet_notifier(NETDEV_UP)`
that already found the socket in `sklist` can re-register the hook.
For fanout sockets, this re-registration calls `__fanout_link(sk, po)`
which adds the socket back into `f->arr[]` and increments `f->num_members`,
but does NOT increment `f->sk_ref`.

The fix sets `po->num` to zero in `packet_release` while `bind_lock` is
held to prevent NETDEV_UP from linking, preventing the race window.

This bug was found following an additional audit with Claude Code based
on CVE-2025-38617.

Fixes: ce06b03e60 ("packet: Add helpers to register/unregister ->prot_hook")
Link: https://blog.calif.io/p/a-race-within-a-race-exploiting-cve
Signed-off-by: Yochai Eisenrich <echelonh@gmail.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260319200610.25101-1-echelonh@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-04-18 10:33:25 +02:00
..
6lowpan 6lowpan: iphc: Fix an off-by-one check of array index 2021-07-22 16:19:03 +02:00
9p net/9p: fix double req put in p9_fd_cancelled 2025-10-19 16:21:28 +02:00
802 net: 802: LLC+SNAP OID:PID lookup on start of skb data 2025-01-23 17:15:49 +01:00
8021q net: vlan: sync VLAN features with lower device 2025-12-07 06:09:26 +09:00
appletalk net: appletalk: Fix use-after-free in AARP proxy probe 2025-08-28 16:24:04 +02:00
atm atm: lec: fix null-ptr-deref in lec_arp_clear_vccs 2026-04-18 10:33:10 +02:00
ax25 ax25: properly unshare skbs in ax25_kiss_rcv() 2025-09-09 18:50:20 +02:00
batman-adv batman-adv: avoid OGM aggregation when skb tailroom is insufficient 2026-04-18 10:33:19 +02:00
bluetooth Bluetooth: L2CAP: Fix null-ptr-deref on l2cap_sock_ready_cb 2026-04-18 10:33:24 +02:00
bpf bpf: Do not let BPF test infra emit invalid GSO types to stack 2026-02-06 16:41:58 +01:00
bpfilter bpfilter: Specify the log level for the kmsg message 2021-06-25 13:13:50 +02:00
bridge net: bridge: fix nd_tbl NULL dereference when IPv6 is disabled 2026-04-18 10:33:10 +02:00
caif caif: fix integer underflow in cffrml_receive() 2026-01-19 13:09:44 +01:00
can can: statistics: add missing atomic access in hot path 2026-04-18 10:33:24 +02:00
ceph libceph: admit message frames only in CEPH_CON_S_OPEN state 2026-04-18 10:33:14 +02:00
core rtnetlink: count IFLA_INFO_SLAVE_KIND in if_nlmsg_size 2026-04-18 10:33:24 +02:00
dcb net: dcb: choose correct policy to parse DCB_ATTR_BCN 2023-08-11 15:13:53 +02:00
dccp net: fix data-races around sk->sk_forward_alloc 2025-01-23 17:16:04 +01:00
dns_resolver keys, dns: Fix size check of V1 server-list header 2024-01-25 14:52:46 -08:00
dsa net: dsa: free routing table on probe failure 2026-02-19 16:21:45 +01:00
ethernet gro: remove rcu_read_lock/rcu_read_unlock from gro_complete handlers 2024-09-12 11:07:47 +02:00
ethtool ethtool: add support to set/get tx copybreak buf size via ethtool 2026-03-04 07:19:36 -05:00
hsr net/hsr: fix NULL pointer dereference in prp_get_untagged_frame() 2026-01-19 13:09:46 +01:00
ieee802154 net: ieee802154: do not leave a dangling sk pointer in ieee802154_create() 2024-12-14 19:51:37 +01:00
ife net: sched: ife: fix potential use-after-free 2024-01-05 15:13:29 +01:00
ipv4 esp: fix skb leak with espintcp and async crypto 2026-04-18 10:33:24 +02:00
ipv6 esp: fix skb leak with espintcp and async crypto 2026-04-18 10:33:24 +02:00
iucv s390/iucv: fix receive buffer virtual vs physical address confusion 2024-09-04 13:23:27 +02:00
kcm kcm: Serialise kcm_sendmsg() for the same socket. 2024-09-04 13:23:32 +02:00
key af_key: validate families in pfkey_send_migrate() 2026-04-18 10:33:24 +02:00
l2tp l2tp: do not use sock_hold() in pppol2tp_session_get_sock() 2026-04-18 10:33:17 +02:00
l3mdev net: Add l3mdev index to flow struct and avoid oif reset for port devices 2024-10-17 15:11:57 +02:00
lapb net: lapb: Use list_for_each_entry() to simplify code in lapb_iface.c 2021-06-08 16:31:25 -07:00
llc llc: fix data loss when reading from a socket in llc_ui_recvmsg() 2025-06-04 14:38:06 +02:00
mac80211 wifi: mac80211: fix NULL deref in mesh_matches_local() 2026-04-18 10:33:21 +02:00
mac802154 mac802154: check local interfaces before deleting sdata list 2025-01-23 17:16:00 +01:00
mctp net: mctp: Prevent duplicate binds 2025-08-28 16:24:20 +02:00
mpls mpls: Use rcu_dereference_rtnl() in mpls_route_input_rcu(). 2025-06-27 11:05:36 +01:00
mptcp mptcp: pm: avoid sending RM_ADDR over same subflow 2026-04-18 10:33:19 +02:00
ncsi net: ncsi: fix skb leak in error paths 2026-04-18 10:33:15 +02:00
netfilter netfilter: nft_set_pipapo: split gc into unlink and reclaim phase 2026-04-18 10:33:22 +02:00
netlabel calipso: unlock rcu before returning -EAFNOSUPPORT 2025-06-27 11:05:22 +01:00
netlink netlink: avoid infinite retry looping in netlink_unicast() 2025-08-28 16:24:15 +02:00
netrom netrom: fix double-free in nr_route_frame() 2026-02-06 16:41:58 +01:00
nfc nfc: nci: fix circular locking dependency in nci_close_device 2026-04-18 10:33:24 +02:00
nsh nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment(). 2024-05-17 11:50:48 +02:00
openvswitch openvswitch: validate MPLS set/set_masked payload length 2026-04-18 10:33:24 +02:00
packet net: fix fanout UAF in packet_release() via NETDEV_UP race 2026-04-18 10:33:25 +02:00
phonet phonet/pep: Move call to pn_skb_get_dst_sockaddr() earlier in pep_sock_accept() 2025-08-28 16:23:59 +02:00
psample psample: Require 'CAP_NET_ADMIN' when joining "packets" group 2023-12-13 18:36:37 +01:00
qrtr net: qrtr: Update packets cloning when broadcasting 2024-10-17 15:11:08 +02:00
rds net/rds: Clear reconnect pending bit 2026-03-04 07:20:11 -05:00
rfkill net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer 2025-10-02 13:39:09 +02:00
rose net/rose: fix NULL pointer dereference in rose_transmit_link on reconnect 2026-04-18 10:33:20 +02:00
rxrpc rxrpc: Fix oops due to non-existence of prealloc backlog struct 2025-07-17 18:30:48 +02:00
sched net/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit 2026-04-18 10:33:12 +02:00
sctp sctp: move SCTP_CMD_ASSOC_SHKEY right after SCTP_CMD_PEER_INIT 2026-02-06 16:41:52 +01:00
smc net/smc: fix double-free of smc_spd_priv when tee() duplicates splice pipe buffer 2026-04-18 10:33:24 +02:00
strparser strparser: Fix signed/unsigned mismatch bug 2025-12-07 06:09:29 +09:00
sunrpc sunrpc: fix cache_request leak in cache_release 2026-04-18 10:33:17 +02:00
switchdev net: make switchdev_bridge_port_{,unoffload} loosely coupled with the bridge 2021-08-04 12:35:07 +01:00
tipc tipc: fix divide-by-zero in tipc_sk_filter_connect() 2026-04-18 10:33:14 +02:00
tls tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock(). 2026-02-06 16:42:01 +01:00
unix af_unix: Don't leave consecutive consumed OOB skbs. 2025-10-02 13:39:14 +02:00
vmw_vsock vmw_vsock: bypass false-positive Wnonnull warning with gcc-16 2026-03-04 07:20:11 -05:00
wireless wifi: cfg80211: cancel rfkill_block work in wiphy_unregister() 2026-04-18 10:33:19 +02:00
x25 net/x25: fix incorrect parameter validation in the x25_getsockopt() function 2024-03-26 18:21:23 -04:00
xdp xsk: fix OOB map writes when deleting elements 2024-12-14 19:51:33 +01:00
xfrm xfrm: Fix the usage of skb->sk 2026-04-18 10:33:24 +02:00
compat.c net: Return the correct errno code 2021-06-03 15:13:56 -07:00
devres.c net: devres: Correct a grammatical error 2021-06-11 12:55:28 -07:00
Kconfig Remove DECnet support from kernel 2023-06-21 15:59:15 +02:00
Makefile Remove DECnet support from kernel 2023-06-21 15:59:15 +02:00
socket.c net: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF. 2026-01-19 13:10:11 +01:00
sysctl_net.c net: Ensure net namespace isolation of sysctls 2021-04-12 13:27:11 -07:00