The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - smc: Fix use-after-free in tcp_write_timer_handler(). With Eric's ref tracker, syzbot finally found a     repro for use-after-free in tcp_write_timer_handler() by kernel TCP sockets. [0] If SMC creates a kernel     socket in __smc_create(), the kernel socket is supposed to be freed in smc_clcsock_release() by calling     sock_release() when we close() the parent SMC socket. However, at the end of smc_clcsock_release(), the     kernel socket's sk_state might not be TCP_CLOSE. This means that we have not called     inet_csk_destroy_sock() in __tcp_close() and have not stopped the TCP timers. The kernel socket's TCP     timers can be fired later, so we need to hold a refcnt for net as we do for MPTCP subflows in     mptcp_subflow_create_socket(). [0]: leaked reference. sk_alloc (./include/net/net_namespace.h:335     net/core/sock.c:2108) inet_create (net/ipv4/af_inet.c:319 net/ipv4/af_inet.c:244) __sock_create     (net/socket.c:1546) smc_create (net/smc/af_smc.c:3269 net/smc/af_smc.c:3284) __sock_create     (net/socket.c:1546) __sys_socket (net/socket.c:1634 net/socket.c:1618 net/socket.c:1661) __x64_sys_socket     (net/socket.c:1672) do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)     entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)     ================================================================== BUG: KASAN: slab-use-after-free in     tcp_write_timer_handler (net/ipv4/tcp_timer.c:378 net/ipv4/tcp_timer.c:624 net/ipv4/tcp_timer.c:594) Read     of size 1 at addr ffff888052b65e0d by task syzrepro/18091 CPU: 0 PID: 18091 Comm: syzrepro Tainted: G W     6.3.0-rc4-01174-gb5d54eb5899a #7 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS     1.16.0-1.amzn2022.0.1 04/01/2014 Call Trace: <IRQ> dump_stack_lvl (lib/dump_stack.c:107) print_report     (mm/kasan/report.c:320 mm/kasan/report.c:430) kasan_report (mm/kasan/report.c:538) tcp_write_timer_handler     (net/ipv4/tcp_timer.c:378 net/ipv4/tcp_timer.c:624 net/ipv4/tcp_timer.c:594) tcp_write_timer     (./include/linux/spinlock.h:390 net/ipv4/tcp_timer.c:643) call_timer_fn     (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207     ./include/trace/events/timer.h:127 kernel/time/timer.c:1701) __run_timers.part.0 (kernel/time/timer.c:1752     kernel/time/timer.c:2022) run_timer_softirq (kernel/time/timer.c:2037) __do_softirq     (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./include/trace/events/irq.h:142     kernel/softirq.c:572) __irq_exit_rcu (kernel/softirq.c:445 kernel/softirq.c:650) irq_exit_rcu     (kernel/softirq.c:664) sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1107 (discriminator 14))     </IRQ> (CVE-2023-53781)

Note that Nessus relies on the presence of the package as reported by the vendor.

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Linux Distros Unpatched Vulnerability : CVE-2023-53781

medium Nessus Plugin ID 277916

Version 1.3

Version 1.2

Version 1.1

Version 1.3 Dec 12, 2025, 12:11 AM Detection (updated detection logic) Plugin metadata Plugin Feed: 202512120011
Version 1.2 Dec 11, 2025, 12:59 PM Detection (updated detection logic) Plugin metadata Plugin Feed: 202512111259
Version 1.1 Dec 10, 2025, 9:29 AM New Plugin Feed: 202512100929