high
7.8
EPSS
0.043%
Advisory Published
CVE Published
Updated

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 SoftwareAffected VersionHow to fix
redhat/kernel<6.8.5
6.8.5
redhat/kernel<6.9
6.9
Linux Kernel>=6.7<6.8.5
Linux Kernel=6.9-rc1
Linux Kernel=6.9-rc2
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.15-1

Remedy

https://git.kernel.org/stable/c/3ffb1ab698376f09cc33101c07c1be229389fe29

Remedy

https://git.kernel.org/stable/c/ee3c845787b621cfe82c2e52c513024a9d7a78f5

Remedy

https://git.kernel.org/stable/c/fcf4692fa39e86a590c14a4af2de704e1d20a3b5

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2024-35894?

    CVE-2024-35894 has a severity rating that indicates it can lead to potential denial-of-service conditions in affected Linux kernel versions.

  • How do I fix CVE-2024-35894?

    The recommended fix for CVE-2024-35894 is to update the Linux kernel to versions 6.8.5 or 6.9.

  • Which Linux kernel versions are affected by CVE-2024-35894?

    CVE-2024-35894 affects Linux kernel versions prior to 6.8.5 and includes certain pre-release versions of 6.9.

  • Who reported CVE-2024-35894?

    CVE-2024-35894 was reported by an individual named Alexei.

  • What type of vulnerability is CVE-2024-35894?

    CVE-2024-35894 is a vulnerability in the Linux kernel that affects the management of subflow sockets in multi-path TCP (MPTCP).

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