UBUNTU-CVE-2024-56642
In the Linux kernel, the following vulnerability has been resolved: tipc: Fix use-after-free of kernel socket in cleanup_bearer(). syzkaller reported a use-after-free of UDP kernel socket in cleanup_bearer() without repro. [0][1] When bearer_disable() calls tipc_udp_disable(), cleanup of the UDP kernel socket is deferred by work calling cleanup_bearer(). tipc_exit_net() waits for such works to finish by checking tipc_net(net)->wq_count. However, the work decrements the count too early before releasing the kernel socket, unblocking cleanup_net() and resulting in use-after-free. Let's move the decrement after releasing the socket in cleanup_bearer(). [0]: ref_tracker: net notrefcnt@000000009b3d1faf has 1/1 users at sk_alloc+0x438/0x608 inet_create+0x4c8/0xcb0 __sock_create+0x350/0x6b8 sock_create_kern+0x58/0x78 udp_sock_create4+0x68/0x398 udp_sock_create+0x88/0xc8 tipc_udp_enable+0x5e8/0x848 __tipc_nl_bearer_enable+0x84c/0xed8 tipc_nl_bearer_enable+0x38/0x60 genl_family_rcv_msg_doit+0x170/0x248 genl_rcv_msg+0x400/0x5b0 netlink_rcv_skb+0x1dc/0x398 genl_rcv+0x44/0x68 netlink_unicast+0x678/0x8b0 netlink_sendmsg+0x5e4/0x898 ____sys_sendmsg+0x500/0x830 [1]: BUG: KMSAN: use-after-free in udp_hashslot include/net/udp.h:85 [inline] BUG: KMSAN: use-after-free in udp_lib_unhash+0x3b8/0x930 net/ipv4/udp.c:1979 udp_hashslot include/net/udp.h:85 [inline] udp_lib_unhash+0x3b8/0x930 net/ipv4/udp.c:1979 sk_common_release+0xaf/0x3f0 net/core/sock.c:3820 inet_release+0x1e0/0x260 net/ipv4/af_inet.c:437 inet6_release+0x6f/0xd0 net/ipv6/af_inet6.c:489 __sock_release net/socket.c:658 [inline] sock_release+0xa0/0x210 net/socket.c:686 cleanup_bearer+0x42d/0x4c0 net/tipc/udp_media.c:819 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xcaf/0x1c90 kernel/workqueue.c:3310 worker_thread+0xf6c/0x1510 kernel/workqueue.c:3391 kthread+0x531/0x6b0 kernel/kthread.c:389 ret_from_fork+0x60/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244 Uninit was created at: slab_free_hook mm/slub.c:2269 [inline] slab_free mm/slub.c:4580 [inline] kmem_cache_free+0x207/0xc40 mm/slub.c:4682 net_free net/core/net_namespace.c:454 [inline] cleanup_net+0x16f2/0x19d0 net/core/net_namespace.c:647 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xcaf/0x1c90 kernel/workqueue.c:3310 worker_thread+0xf6c/0x1510 kernel/workqueue.c:3391 kthread+0x531/0x6b0 kernel/kthread.c:389 ret_from_fork+0x60/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244 CPU: 0 UID: 0 PID: 54 Comm: kworker/0:2 Not tainted 6.12.0-rc1-00131-gf66ebf37d69c #7 91723d6f74857f70725e1583cba3cf4adc716cfa Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 Workqueue: events cleanup_bearer
02 / AFFECTED SOFTWARE
Affected packages
50 explicit affected versions
6 explicit affected versions
10 explicit affected versions
60 explicit affected versions
16 explicit affected versions
1 explicit affected versions
1 explicit affected versions
1 explicit affected versions
106 explicit affected versions
15 explicit affected versions
13 explicit affected versions
8 explicit affected versions
93 explicit affected versions
13 explicit affected versions
10 explicit affected versions
23 explicit affected versions
63 explicit affected versions
24 explicit affected versions
2 explicit affected versions
20 explicit affected versions
81 explicit affected versions
17 explicit affected versions
8 explicit affected versions
26 explicit affected versions
5 explicit affected versions
8 explicit affected versions
1 explicit affected versions
10 explicit affected versions
29 explicit affected versions
91 explicit affected versions
44 explicit affected versions
37 explicit affected versions
25 explicit affected versions
33 explicit affected versions
1 explicit affected versions
1 explicit affected versions
1 explicit affected versions
19 explicit affected versions
1 explicit affected versions
11 explicit affected versions
43 explicit affected versions
59 explicit affected versions
1 explicit affected versions
1 explicit affected versions
21 explicit affected versions
16 explicit affected versions
10 explicit affected versions
12 explicit affected versions
19 explicit affected versions
6 explicit affected versions
69 explicit affected versions
21 explicit affected versions
54 explicit affected versions
72 explicit affected versions
62 explicit affected versions
55 explicit affected versions
12 explicit affected versions
19 explicit affected versions
61 explicit affected versions
7 explicit affected versions
100 explicit affected versions
13 explicit affected versions
71 explicit affected versions
18 explicit affected versions
35 explicit affected versions
21 explicit affected versions
19 explicit affected versions
18 explicit affected versions
20 explicit affected versions
102 explicit affected versions
64 explicit affected versions
21 explicit affected versions
102 explicit affected versions
13 explicit affected versions
4 explicit affected versions
23 explicit affected versions
107 explicit affected versions
26 explicit affected versions
57 explicit affected versions
22 explicit affected versions
2 explicit affected versions
7 explicit affected versions
12 explicit affected versions
52 explicit affected versions
12 explicit affected versions
14 explicit affected versions
7 explicit affected versions
2 explicit affected versions
89 explicit affected versions
12 explicit affected versions
14 explicit affected versions
105 explicit affected versions
113 explicit affected versions
12 explicit affected versions
16 explicit affected versions
100 explicit affected versions
10 explicit affected versions
10 explicit affected versions
174 explicit affected versions
37 explicit affected versions
1 explicit affected versions
13 explicit affected versions
37 explicit affected versions
26 explicit affected versions
13 explicit affected versions
12 explicit affected versions
151 explicit affected versions
66 explicit affected versions
15 explicit affected versions
16 explicit affected versions
1 explicit affected versions
87 explicit affected versions
137 explicit affected versions
61 explicit affected versions
105 explicit affected versions
24 explicit affected versions
33 explicit affected versions
23 explicit affected versions
1 explicit affected versions
100 explicit affected versions
11 explicit affected versions
12 explicit affected versions
10 explicit affected versions
123 explicit affected versions
7 explicit affected versions
12 explicit affected versions
103 explicit affected versions
2 explicit affected versions
11 explicit affected versions
52 explicit affected versions
46 explicit affected versions
116 explicit affected versions
62 explicit affected versions
26 explicit affected versions
20 explicit affected versions
38 explicit affected versions
1 explicit affected versions
13 explicit affected versions
21 explicit affected versions
123 explicit affected versions
63 explicit affected versions
16 explicit affected versions
53 explicit affected versions
3 explicit affected versions
77 explicit affected versions
1 explicit affected versions
1 explicit affected versions
1 explicit affected versions
70 explicit affected versions
51 explicit affected versions
76 explicit affected versions
9 explicit affected versions
1 explicit affected versions
12 explicit affected versions
49 explicit affected versions
27 explicit affected versions
36 explicit affected versions
7 explicit affected versions
2 explicit affected versions
20 explicit affected versions
13 explicit affected versions
92 explicit affected versions
13 explicit affected versions
56 explicit affected versions
78 explicit affected versions
54 explicit affected versions
10 explicit affected versions
12 explicit affected versions
15 explicit affected versions
7 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
45 explicit affected versions
14 explicit affected versions
38 explicit affected versions
53 explicit affected versions
9 explicit affected versions
4 explicit affected versions
51 explicit affected versions
11 explicit affected versions
15 explicit affected versions
7 explicit affected versions
62 explicit affected versions
84 explicit affected versions
64 explicit affected versions
127 explicit affected versions
106 explicit affected versions
60 explicit affected versions
99 explicit affected versions
13 explicit affected versions
43 explicit affected versions
8 explicit affected versions
58 explicit affected versions
130 explicit affected versions
151 explicit affected versions
10 explicit affected versions
14 explicit affected versions
92 explicit affected versions
4 explicit affected versions
78 explicit affected versions
11 explicit affected versions
53 explicit affected versions
14 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: tipc: Fix use-after-free of kernel socket in cleanup_bearer(). syzkaller reported a use-after-free of UDP kernel socket in cleanup_bearer() without repro. [0][1] When bearer_disable() calls tipc_udp_disable(), cleanup of the UDP kernel socket is deferred by work calling cleanup_bearer(). tipc_exit_net() waits for such works to finish by checking tipc_net(net)->wq_count. However, the work decrements the count too early before releasing the kernel socket, unblocking cleanup_net() and resulting in use-after-free. Let's move the decrement after releasing the socket in cleanup_bearer(). [0]: ref_tracker: net notrefcnt@000000009b3d1faf has 1/1 users at sk_alloc+0x438/0x608 inet_create+0x4c8/0xcb0 __sock_create+0x350/0x6b8 sock_create_kern+0x58/0x78 udp_sock_create4+0x68/0x398 udp_sock_create+0x88/0xc8 tipc_udp_enable+0x5e8/0x848 __tipc_nl_bearer_enable+0x84c/0xed8 tipc_nl_bearer_enable+0x38/0x60 genl_family_rcv_msg_doit+0x170/0x248 genl_rcv_msg+0x400/0x5b0 netlink_rcv_skb+0x1dc/0x398 genl_rcv+0x44/0x68 netlink_unicast+0x678/0x8b0 netlink_sendmsg+0x5e4/0x898 ____sys_sendmsg+0x500/0x830 [1]: BUG: KMSAN: use-after-free in udp_hashslot include/net/udp.h:85 [inline] BUG: KMSAN: use-after-free in udp_lib_unhash+0x3b8/0x930 net/ipv4/udp.c:1979 udp_hashslot include/net/udp.h:85 [inline] udp_lib_unhash+0x3b8/0x930 net/ipv4/udp.c:1979 sk_common_release+0xaf/0x3f0 net/core/sock.c:3820 inet_release+0x1e0/0x260 net/ipv4/af_inet.c:437 inet6_release+0x6f/0xd0 net/ipv6/af_inet6.c:489 __sock_release net/socket.c:658 [inline] sock_release+0xa0/0x210 net/socket.c:686 cleanup_bearer+0x42d/0x4c0 net/tipc/udp_media.c:819 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xcaf/0x1c90 kernel/workqueue.c:3310 worker_thread+0xf6c/0x1510 kernel/workqueue.c:3391 kthread+0x531/0x6b0 kernel/kthread.c:389 ret_from_fork+0x60/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244 Uninit was created at: slab_free_hook mm/slub.c:2269 [inline] slab_free mm/slub.c:4580 [inline] kmem_cache_free+0x207/0xc40 mm/slub.c:4682 net_free net/core/net_namespace.c:454 [inline] cleanup_net+0x16f2/0x19d0 net/core/net_namespace.c:647 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xcaf/0x1c90 kernel/workqueue.c:3310 worker_thread+0xf6c/0x1510 kernel/workqueue.c:3391 kthread+0x531/0x6b0 kernel/kthread.c:389 ret_from_fork+0x60/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244 CPU: 0 UID: 0 PID: 54 Comm: kworker/0:2 Not tainted 6.12.0-rc1-00131-gf66ebf37d69c #7 91723d6f74857f70725e1583cba3cf4adc716cfa Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 Workqueue: events cleanup_bearer
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/6a2fa13312e51a621f652d522d7e2df7066330b6
- https://git.kernel.org/stable/c/4e69457f9dfae67435f3ccf29008768eae860415
- https://git.kernel.org/stable/c/650ee9a22d7a2de8999fac2d45983597a0c22359
- https://git.kernel.org/stable/c/6a2fa13312e51a621f652d522d7e2df7066330b6
- https://git.kernel.org/stable/c/d00d4470bf8c4282617a3a10e76b20a9c7e4cffa
- https://git.kernel.org/stable/c/d2a4894f238551eae178904e7f45af87577074fd
- https://git.kernel.org/stable/c/d62d5180c036eeac09f80660edc7a602b369125f
- https://git.kernel.org/stable/c/e48b211c4c59062cb6dd6c2c37c51a7cc235a464
- https://ubuntu.com/security/CVE-2024-56642
- https://ubuntu.com/security/notices/USN-7379-1
- https://ubuntu.com/security/notices/USN-7379-2
- https://ubuntu.com/security/notices/USN-7380-1
- https://ubuntu.com/security/notices/USN-7381-1
- https://ubuntu.com/security/notices/USN-7382-1
- https://ubuntu.com/security/notices/USN-7387-1
- https://ubuntu.com/security/notices/USN-7387-2
- https://ubuntu.com/security/notices/USN-7387-3
- https://ubuntu.com/security/notices/USN-7388-1
- https://ubuntu.com/security/notices/USN-7389-1
- https://ubuntu.com/security/notices/USN-7390-1
- https://ubuntu.com/security/notices/USN-7391-1
- https://ubuntu.com/security/notices/USN-7392-1
- https://ubuntu.com/security/notices/USN-7392-2
- https://ubuntu.com/security/notices/USN-7392-3
- https://ubuntu.com/security/notices/USN-7392-4
- https://ubuntu.com/security/notices/USN-7393-1
- https://ubuntu.com/security/notices/USN-7401-1
- https://ubuntu.com/security/notices/USN-7407-1
- https://ubuntu.com/security/notices/USN-7413-1
- https://ubuntu.com/security/notices/USN-7421-1
- https://ubuntu.com/security/notices/USN-7449-1
- https://ubuntu.com/security/notices/USN-7449-2
- https://ubuntu.com/security/notices/USN-7450-1
- https://ubuntu.com/security/notices/USN-7451-1
- https://ubuntu.com/security/notices/USN-7452-1
- https://ubuntu.com/security/notices/USN-7453-1
- https://ubuntu.com/security/notices/USN-7458-1
- https://ubuntu.com/security/notices/USN-7459-1
- https://ubuntu.com/security/notices/USN-7459-2
- https://ubuntu.com/security/notices/USN-7463-1
- https://ubuntu.com/security/notices/USN-7468-1
- https://ubuntu.com/security/notices/USN-7496-1
- https://ubuntu.com/security/notices/USN-7496-3
- https://ubuntu.com/security/notices/USN-7496-4
- https://ubuntu.com/security/notices/USN-7496-5
- https://ubuntu.com/security/notices/USN-7506-1
- https://ubuntu.com/security/notices/USN-7506-2
- https://ubuntu.com/security/notices/USN-7506-3
- https://ubuntu.com/security/notices/USN-7506-4
- https://ubuntu.com/security/notices/USN-7523-1
- https://ubuntu.com/security/notices/USN-7524-1
- https://ubuntu.com/security/notices/USN-7539-1
- https://ubuntu.com/security/notices/USN-7540-1
- https://www.cve.org/CVERecord?id=CVE-2024-56642