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CVE-2023-53781 is a use-after-free vulnerability in the Linux kernel's SMC subsystem affecting tcp_write_timer_handler(). SMC creates an underlying kernel TCP socket in __smc_create() and releases it through smc_clcsock_release() when the parent SMC socket is closed. The underlying socket may remain in a state other than TCP_CLOSE, preventing __tcp_close() from calling inet_csk_destroy_sock() and stopping its TCP timers. Those timers can subsequently fire without the required network namespace lifetime protection, resulting in a use-after-free during TCP timer processing. syzbot reproduced the defect, and KASAN detected an invalid read in interrupt-context timer handling. The fix retains a network namespace reference for the kernel socket, similarly to MPTCP subflows.
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A use-after-free vulnerability involving tcp_write_timer_handler() in the Linux kernel's SMC subsystem. Red Hat addresses it in RHSA-2026:77301 through kernel update 4.18.0-477.172.1.el8_8; a reboot is required.
A Linux kernel SMC component use-after-free vulnerability in tcp_write_timer_handler().
A Linux kernel SMC use-after-free vulnerability in tcp_write_timer_handler(). It is addressed by the RHEL 8 kernel update RHSA-2026:69874.
A Linux kernel SMC use-after-free flaw in tcp_write_timer_handler().
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Cross-references every affected SKU, including bundled OEM variants.
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