{
  "cveId": "CVE-2023-53781",
  "url": "https://patchblox.com/security/cve/CVE-2023-53781",
  "summary": "CVE-2023-53781 is fixed in 78 products on 1 platform, first by RHSA-2025:20518, released November 11, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  smc: Fix use-after-free in tcp_write_timer_handl...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  smc: Fix use-after-free in tcp_write_timer_handler().  With Eric\u0027s 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\u0027s 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\u0027s 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 \u002B PIIX, 1996), BIOS 1.16.0-1.amzn2022.0.1 04/01/2014 Call Trace:  \u003CIRQ\u003E  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))  \u003C/IRQ\u003E",
  "published": "2025-11-11T00:00:00Z",
  "severity": "high",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00148,
  "epssPercentile": 0.04038,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "fix": "RHSA-2026:25121",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-25121",
      "released": "2026-06-24T14:07:58Z"
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    {
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      "release": "almalinux 8",
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      "url": "https://patchblox.com/security/fix/linux/alsa-2026-25121",
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