CVE-2024-35894: mptcp: prevent BPF accessing lowat from a subflow socket.
First published: Sun May 19 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: mptcp: prevent BPF accessing lowat from a subflow socket. Alexei reported the following splat: WARNING: CPU: 32 PID: 3276 at net/mptcp/subflow.c:1430 subflow_data_ready+0x147/0x1c0 Modules linked in: dummy bpf_testmod(O) [last unloaded: bpf_test_no_cfi(O)] CPU: 32 PID: 3276 Comm: test_progs Tainted: GO 6.8.0-12873-g2c43c33bfd23 Call Trace: <TASK> mptcp_set_rcvlowat+0x79/0x1d0 sk_setsockopt+0x6c0/0x1540 __bpf_setsockopt+0x6f/0x90 bpf_sock_ops_setsockopt+0x3c/0x90 bpf_prog_509ce5db2c7f9981_bpf_test_sockopt_int+0xb4/0x11b bpf_prog_dce07e362d941d2b_bpf_test_socket_sockopt+0x12b/0x132 bpf_prog_348c9b5faaf10092_skops_sockopt+0x954/0xe86 __cgroup_bpf_run_filter_sock_ops+0xbc/0x250 tcp_connect+0x879/0x1160 tcp_v6_connect+0x50c/0x870 mptcp_connect+0x129/0x280 __inet_stream_connect+0xce/0x370 inet_stream_connect+0x36/0x50 bpf_trampoline_6442491565+0x49/0xef inet_stream_connect+0x5/0x50 __sys_connect+0x63/0x90 __x64_sys_connect+0x14/0x20 The root cause of the issue is that bpf allows accessing mptcp-level proto_ops from a tcp subflow scope. Fix the issue detecting the problematic call and preventing any action.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.106-3 6.1.112-1 6.10.11-1 6.11.2-1 |
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Reference Links
- https://git.kernel.org/stable/c/3ffb1ab698376f09cc33101c07c1be229389fe29
- https://git.kernel.org/stable/c/fcf4692fa39e86a590c14a4af2de704e1d20a3b5
- https://launchpad.net/bugs/cve/CVE-2024-35894
- https://git.kernel.org/stable/c/ee3c845787b621cfe82c2e52c513024a9d7a78f5
- https://git.kernel.org/linus/fcf4692fa39e86a590c14a4af2de704e1d20a3b5
- https://security-tracker.debian.org/tracker/CVE-2024-35894
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-35894
- https://nvd.nist.gov/vuln/detail/CVE-2024-35894
- https://ubuntu.com/security/CVE-2024-35894
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