Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 124a4885b55f3039c697feb53edc5ad88bf21161 before ee3c845787b621cfe82c2e52c513024a9d7a78f5; affected 5684ab1a0effbfeb706f47d85785f653005b97b1 before 3ffb1ab698376f09cc33101c07c1be229389fe29; affected 5684ab1a0effbfeb706f47d85785f653005b97b1 before fcf4692fa39e86a590c14a4af2de704e1d20a3b5 |
| Linux / Linux | affected 6.7; unaffected 0 before 6.7; unaffected 6.8.5 through 6.8.*; unaffected 6.9 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ee3c845787b621cfe82c2e52c513024a9d7a78f5
- https://git.kernel.org/stable/c/3ffb1ab698376f09cc33101c07c1be229389fe29
- https://git.kernel.org/stable/c/fcf4692fa39e86a590c14a4af2de704e1d20a3b5
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.