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CVE-2023-53781 is a use-after-free vulnerability in the Linux kernel SMC subsystem involving TCP timer handling for kernel sockets created by SMC. When SMC creates a kernel TCP socket in __smc_create(), that socket is later released from smc_clcsock_release() when the parent SMC socket is closed. In the vulnerable condition, the socket state may still not be TCP_CLOSE at the end of smc_clcsock_release(). As a result, __tcp_close() may not invoke inet_csk_destroy_sock(), leaving TCP timers active after the underlying socket has been freed. A later timer firing in tcp_write_timer_handler() can then dereference freed socket memory, producing a slab use-after-free in kernel context. The fix is to retain the required net namespace reference for the kernel socket, analogous to the handling used for MPTCP subflows, so timer activity cannot outlive the referenced networking context and freed socket state.
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A Linux kernel use-after-free vulnerability in the SMC/TCP socket handling path, where TCP timers on a kernel socket may fire after the socket is released, leading to slab use-after-free in tcp_write_timer_handler().
A Linux kernel use-after-free vulnerability in the smc component's tcp_write_timer_handler() function.
A Linux kernel use-after-free vulnerability in the SMC subsystem's tcp_write_timer_handler() function.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.