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Kyle Zeng 0b35dc8527 netfilter: x_tables: avoid leaking percpu counter pointers 
[ Upstream commit f7f2fbb0e8 ]

The native and compat get-entries paths copy the fixed rule entry header
from the kernelized rule blob to userspace before overwriting the entry's
counter fields with a sanitized counter snapshot.

On SMP kernels, entry->counters.pcnt contains the percpu allocation
address used by x_tables rule counters. A caller can provide a userspace
buffer that faults during the initial fixed-header copy after pcnt has
been copied but before the later sanitized counter copy runs. The syscall
then returns -EFAULT while leaving the raw percpu pointer in userspace.

Copy only the fixed entry prefix before counters from the kernelized rule
blob, then copy the sanitized counter snapshot into the counter field.
Apply this ordering to the IPv4, IPv6, and ARP native and compat
get-entries implementations so a fault cannot expose the internal percpu
counter pointer.

Fixes: 71ae0dff02 ("netfilter: xtables: use percpu rule counters")
Signed-off-by: Kyle Zeng <kylebot@openai.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-06-19 13:33:35 +02:00
..
6lowpan 6lowpan: fix off-by-one in multicast context address compression 2026-06-19 13:33:33 +02:00
9p net/9p: fix double req put in p9_fd_cancelled 2025-10-19 16:21:28 +02:00
802 net/802/mrp: fix vector attribute parsing in mrp_pdu_parse_vecattr 2026-06-19 13:33:34 +02:00
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 use-after-free in sock_def_readable() 2026-04-18 10:33:29 +02:00
ax25 ax25: properly unshare skbs in ax25_kiss_rcv() 2025-09-09 18:50:20 +02:00
batman-adv batman-adv: bla: avoid double decrement of bla.num_requests 2026-06-19 13:33:25 +02:00
bluetooth Bluetooth: fix memory leak in error path of hci_alloc_dev() 2026-06-19 13:33:34 +02:00
bpf bpf: reject short IPv4/IPv6 inputs in bpf_prog_test_run_skb 2026-06-01 17:35:29 +02:00
bpfilter bpfilter: Specify the log level for the kmsg message 2021-06-25 13:13:50 +02:00
bridge netfilter: bridge: make ebt_snat ARP rewrite writable 2026-06-19 13:33:33 +02:00
caif net: caif: clear client service pointer on teardown 2026-06-01 17:35:14 +02:00
can can: raw: fix ro->uniq use-after-free in raw_rcv() 2026-06-01 17:35:04 +02:00
ceph libceph: handle rbtree insertion error in decode_choose_args() 2026-06-01 17:35:45 +02:00
core net: guard timestamp cmsgs to real error queue skbs 2026-06-19 13:33:35 +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: eeprom: add more safeties to EEPROM Netlink fallback 2026-06-19 13:33:24 +02:00
hsr net: hsr: fix VLAN add unwind on slave errors 2026-04-18 10:33:31 +02:00
ieee802154 ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit() 2026-06-19 13:33:34 +02:00
ife net: sched: ife: fix potential use-after-free 2024-01-05 15:13:29 +01:00
ipv4 netfilter: x_tables: avoid leaking percpu counter pointers 2026-06-19 13:33:35 +02:00
ipv6 netfilter: x_tables: avoid leaking percpu counter pointers 2026-06-19 13:33:35 +02:00
iucv net/iucv: fix locking in .getsockopt 2026-06-19 13:33:23 +02:00
kcm kcm: Serialise kcm_sendmsg() for the same socket. 2024-09-04 13:23:32 +02:00
key xfrm: route MIGRATE notifications to caller's netns 2026-06-19 13:33:28 +02:00
l2tp l2tp: Drop large packets with UDP encap 2026-06-01 17:35:03 +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: check tdls flag in ieee80211_tdls_oper 2026-06-01 17:35:45 +02:00
mac802154 mac802154: check local interfaces before deleting sdata list 2025-01-23 17:16:00 +01:00
mctp net: mctp: ensure our nlmsg responses are initialised 2026-06-19 13:33:22 +02:00
mpls mpls: Use rcu_dereference_rtnl() in mpls_route_input_rcu(). 2025-06-27 11:05:36 +01:00
mptcp mptcp: fix scheduling with atomic in timestamp sockopt 2026-06-01 17:35:24 +02:00
ncsi net: ncsi: fix skb leak in error paths 2026-04-18 10:33:15 +02:00
netfilter netfilter: conntrack_irc: fix possible out-of-bounds read 2026-06-19 13:33:33 +02:00
netlabel netlabel: validate unlabeled address and mask attribute lengths 2026-06-19 13:33:35 +02:00
netlink net: netlink: don't set nsid on local notifications 2026-06-19 13:33:23 +02:00
netrom netrom: fix double-free in nr_route_frame() 2026-02-06 16:41:58 +01:00
nfc nfc: hci: fix out-of-bounds read in HCP header parsing 2026-06-19 13:33:28 +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 net: openvswitch: fix possible kfree_skb of ERR_PTR 2026-06-19 13:33:35 +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: disable BH around forwarded sk_receive_skb() 2026-06-01 17:35:46 +02:00
psample psample: Require 'CAP_NET_ADMIN' when joining "packets" group 2023-12-13 18:36:37 +01:00
qrtr net: qrtr: fix refcount saturation and potential UAF in qrtr_port_remove 2026-06-19 13:33:35 +02:00
rds rds: mark snapshot pages dirty in rds_info_getsockopt() 2026-06-19 13:33:35 +02:00
rfkill net: rfkill: prevent unlimited numbers of rfkill events from being created 2026-04-18 10:33:38 +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 missing validation of ticket length in non-XDR key preparsing 2026-06-01 17:35:12 +02:00
sched net/sched: act_api: use RCU with deferred freeing for action lifecycle 2026-06-19 13:33:33 +02:00
sctp sctp: fix uninit-value in __sctp_rcv_asconf_lookup() 2026-06-19 13:33:35 +02:00
smc net/smc: Do not re-initialize smc hashtables 2026-06-19 13:33:23 +02:00
strparser net: strparser: fix skb_head leak in strp_abort_strp() 2026-06-01 17:35:14 +02:00
sunrpc SUNRPC: Do not dereference non-socket transports in sysfs 2026-06-01 17:35:44 +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 double-free in tipc_buf_append() 2026-06-01 17:35:40 +02:00
tls net: tls: prevent chain-after-chain in plain text SG 2026-06-01 17:35:50 +02:00
unix af_unix: read UNIX_DIAG_VFS data under unix_state_lock 2026-06-01 17:35:03 +02:00
vmw_vsock vsock/vmci: fix UAF when peer resets connection during handshake 2026-06-01 17:35:47 +02:00
wireless wifi: cfg80211: advance loop vars in cfg80211_merge_profile() 2026-06-01 17:35:47 +02:00
x25 net/x25: Fix overflow when accumulating packets 2026-04-18 10:33:31 +02:00
xdp xsk: tighten UMEM headroom validation to account for tailroom and min frame 2026-06-01 17:35:02 +02:00
xfrm xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() 2026-06-19 13:33:35 +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: guard timestamp cmsgs to real error queue skbs 2026-06-19 13:33:35 +02:00
sysctl_net.c net: Ensure net namespace isolation of sysctls 2021-04-12 13:27:11 -07:00