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Vulnerability · Published May 19, 2024 · Assigned by Linux

CVE-2024-35894mptcp: prevent BPF accessing lowat from a subflow socket.

High 7.8

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 87.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13linux6.8.9-1DEBIAN-CVE-2024-35894
Debian:14linux6.8.9-1DEBIAN-CVE-2024-35894
Ubuntu:24.04:LTSlinux6.8.0-38.38UBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2024-35894
Ubuntu:24.04:LTSlinux-aws6.8.0-1011.12UBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1011.12~22.04.1UBUNTU-CVE-2024-35894
Ubuntu:24.04:LTSlinux-azure6.8.0-1010.10UBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1010.10~22.04.1UBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2024-35894
Ubuntu:24.04:LTSlinux-gcp6.8.0-1010.11UBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2024-35894
Ubuntu:24.04:LTSlinux-gke6.8.0-1006.9UBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2024-35894
Ubuntu:24.04:LTSlinux-ibm6.8.0-1008.8UBUNTU-CVE-2024-35894
Ubuntu:24.04:LTSlinux-intel6.8.0-1007.14UBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2024-35894
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-38.38.1UBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2024-35894
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1009.9UBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1009.9~22.04.1UBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2024-35894
Ubuntu:24.04:LTSlinux-oem-6.86.8.0-1008.8UBUNTU-CVE-2024-35894
Ubuntu:24.04:LTSlinux-oracle6.8.0-1008.8UBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1008.8~22.04.1UBUNTU-CVE-2024-35894
Ubuntu:24.04:LTSlinux-raspi6.8.0-1007.7UBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2024-35894
Ubuntu:24.04:LTSlinux-riscv6.8.0-38.38.1UBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2024-35894
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2024-35894

Affected products (as reported)

VendorProductVersions
Linux Linux 124a4885b55f3039c697feb53edc5ad88bf21161 – before ee3c845787b621cfe82c2e52c513024a9d7a78f55684ab1a0effbfeb706f47d85785f653005b97b1 – before 3ffb1ab698376f09cc33101c07c1be229389fe295684ab1a0effbfeb706f47d85785f653005b97b1 – before fcf4692fa39e86a590c14a4af2de704e1d20a3b5
Linux Linux 6.7

References