CVE-2021-47593

In the Linux kernel, the following vulnerability has been resolved: mptcp: clear 'kern' flag from fallback sockets The mptcp ULP extension relies on sk-sksockkern being set correctly: It prevents setsockoptfd, IPPROTOTCP, TCPULP, "mptcp", 6; from working for plain tcp sockets any userspace-expose...

CVE-2021-47593

CVE-2021-47593 concerns the Linux kernel mptcp ULP, where the kernel flag handling for fallback sockets could allow a plain TCP subflow to retain kernel ownership and trigger a kernel crash. The issue occurs when accept() returns a plain TCP sk that is still tagged as kernel, allowing setsockopt ...