cve-2021-47593
Vulnerability from cvelistv5
Published
2024-06-19 14:53
Modified
2024-09-11 17:34
Severity
Summary
mptcp: clear 'kern' flag from fallback sockets
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/451f1eded7f56e93aaf52eb547ba97742d9c0e97
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c26ac0ea3a91c210cf90452e625dc441adf3e549
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d6692b3b97bdc165d150f4c1505751a323a80717
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: clear \u0027kern\u0027 flag from fallback sockets\n\nThe mptcp ULP extension relies on sk-\u003esk_sock_kern being set correctly:\nIt prevents setsockopt(fd, IPPROTO_TCP, TCP_ULP, \"mptcp\", 6); from\nworking for plain tcp sockets (any userspace-exposed socket).\n\nBut in case of fallback, accept() can return a plain tcp sk.\nIn such case, sk is still tagged as \u0027kernel\u0027 and setsockopt will work.\n\nThis will crash the kernel, The subflow extension has a NULL ctx-\u003econn\nmptcp socket:\n\nBUG: KASAN: null-ptr-deref in subflow_data_ready+0x181/0x2b0\nCall Trace:\n tcp_data_ready+0xf8/0x370\n [..]"
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