{
  "cveId": "CVE-2026-53260",
  "url": "https://patchblox.com/security/cve/CVE-2026-53260",
  "summary": "CVE-2026-53260 is fixed in 53 products on 1 platform, first by DEBIAN-CVE-2026-53260, released June 28, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  tcp: Add preempt_{disable,enable}_nested() in re...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().  syzbot reported a weird reqsk-\u003Ersk_refcnt underflow in __inet_csk_reqsk_queue_drop().  The captured reqsk_put() in __inet_csk_reqsk_queue_drop() is called only when it successfully removes reqsk from ehash.  Moreover, reqsk_timer_handler() calls another reqsk_put() after that.  This indicates that the reqsk was missing both refcnts for ehash and the timer itself.  Since all the syzbot reports had PREEMPT_RT enabled, the only possible scenario is that reqsk_queue_hash_req() is preempted after mod_timer() and before refcount_set(), and then the timer triggered after 1s aborts the reqsk due to its listener\u0027s close().  Let\u0027s wrap mod_timer() and refcount_set() with preempt_disable_nested() and preempt_enable_nested().  Note that inet_ehash_insert() holds the normal spin_lock() (mutex in PREEMPT_RT), so it must be called outside of preempt_disable_nested(), but this is fine.  The lookup path just ignores 0 sk_refcnt entries in ehash and tries to create another reqsk, but this will fail at inet_ehash_insert().  [0]: refcount_t: underflow; use-after-free. WARNING: lib/refcount.c:28 at refcount_warn_saturate\u002B0xb2/0x110 lib/refcount.c:28, CPU#0: ktimers/0/16 Modules linked in: CPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:refcount_warn_saturate\u002B0xb2/0x110 lib/refcount.c:28 Code: e4 7d d1 0a 67 48 0f b9 3a eb 4a e8 38 3d 23 fd 48 8d 3d e1 7d d1 0a 67 48 0f b9 3a eb 37 e8 25 3d 23 fd 48 8d 3d de 7d d1 0a \u003C67\u003E 48 0f b9 3a eb 24 e8 12 3d 23 fd 48 8d 3d db 7d d1 0a 67 48 0f RSP: 0000:ffffc90000157948 EFLAGS: 00010246 RAX: ffffffff84a1301b RBX: 0000000000000003 RCX: ffff88801ca98000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffffff8f72ae00 RBP: ffffffff99ae3b01 R08: ffff88801ca98000 R09: 0000000000000005 R10: 0000000000000100 R11: 0000000000000004 R12: ffff8880425ef568 R13: ffff8880425ef4f8 R14: ffff8880425ef578 R15: 0000000000000000 FS:  0000000000000000(0000) GS:ffff888126386000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7b46710e9c CR3: 000000000dbb6000 CR4: 00000000003526f0 Call Trace:  \u003CTASK\u003E  __refcount_sub_and_test include/linux/refcount.h:400 [inline]  __refcount_dec_and_test include/linux/refcount.h:432 [inline]  refcount_dec_and_test include/linux/refcount.h:450 [inline]  reqsk_put include/net/request_sock.h:136 [inline]  __inet_csk_reqsk_queue_drop\u002B0x3ce/0x440 net/ipv4/inet_connection_sock.c:1007  reqsk_timer_handler\u002B0x651/0xdf0 net/ipv4/inet_connection_sock.c:1137  call_timer_fn\u002B0x192/0x5e0 kernel/time/timer.c:1748  expire_timers kernel/time/timer.c:1799 [inline]  __run_timers kernel/time/timer.c:2374 [inline]  __run_timer_base\u002B0x6a3/0x9f0 kernel/time/timer.c:2386  run_timer_base kernel/time/timer.c:2395 [inline]  run_timer_softirq\u002B0x67/0x170 kernel/time/timer.c:2403  handle_softirqs\u002B0x1de/0x6d0 kernel/softirq.c:622  __do_softirq kernel/softirq.c:656 [inline]  run_ktimerd\u002B0x69/0x100 kernel/softirq.c:1151  smpboot_thread_fn\u002B0x541/0xa50 kernel/smpboot.c:160  kthread\u002B0x388/0x470 kernel/kthread.c:436  ret_from_fork\u002B0x514/0xb70 arch/x86/kernel/process.c:158  ret_from_fork_asm\u002B0x1a/0x30 arch/x86/entry/entry_64.S:245  \u003C/TASK\u003E",
  "published": "2026-06-25T09:16:43Z",
  "severity": "critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00294,
  "epssPercentile": 0.22201,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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