{
  "cveId": "CVE-2026-45957",
  "url": "https://patchblox.com/security/cve/CVE-2026-45957",
  "summary": "CVE-2026-45957 is fixed in 80 products on 1 platform, first by ALAS2023-2026-1514, released March 30, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  rcu: Fix rcu_read_unlock() deadloop due to softi...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  rcu: Fix rcu_read_unlock() deadloop due to softirq  Commit 5f5fa7ea89dc (\u0022rcu: Don\u0027t use negative nesting depth in __rcu_read_unlock()\u0022) removes the recursion-protection code from __rcu_read_unlock(). Therefore, we could invoke the deadloop in raise_softirq_irqoff() with ftrace enabled as follows:  WARNING: CPU: 0 PID: 0 at kernel/trace/trace.c:3021 __ftrace_trace_stack.constprop.0\u002B0x172/0x180 Modules linked in: my_irq_work(O) CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G O 6.18.0-rc7-dirty #23 PREEMPT(full) Tainted: [O]=OOT_MODULE Hardware name: QEMU Standard PC (i440FX \u002B PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:__ftrace_trace_stack.constprop.0\u002B0x172/0x180 RSP: 0018:ffffc900000034a8 EFLAGS: 00010002 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000 RDX: 0000000000000003 RSI: ffffffff826d7b87 RDI: ffffffff826e9329 RBP: 0000000000090009 R08: 0000000000000005 R09: ffffffff82afbc4c R10: 0000000000000008 R11: 0000000000011d7a R12: 0000000000000000 R13: ffff888003874100 R14: 0000000000000003 R15: ffff8880038c1054 FS:  0000000000000000(0000) GS:ffff8880fa8ea000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055b31fa7f540 CR3: 00000000078f4005 CR4: 0000000000770ef0 PKRU: 55555554 Call Trace:  \u003CIRQ\u003E  trace_buffer_unlock_commit_regs\u002B0x6d/0x220  trace_event_buffer_commit\u002B0x5c/0x260  trace_event_raw_event_softirq\u002B0x47/0x80  raise_softirq_irqoff\u002B0x6e/0xa0  rcu_read_unlock_special\u002B0xb1/0x160  unwind_next_frame\u002B0x203/0x9b0  __unwind_start\u002B0x15d/0x1c0  arch_stack_walk\u002B0x62/0xf0  stack_trace_save\u002B0x48/0x70  __ftrace_trace_stack.constprop.0\u002B0x144/0x180  trace_buffer_unlock_commit_regs\u002B0x6d/0x220  trace_event_buffer_commit\u002B0x5c/0x260  trace_event_raw_event_softirq\u002B0x47/0x80  raise_softirq_irqoff\u002B0x6e/0xa0  rcu_read_unlock_special\u002B0xb1/0x160  unwind_next_frame\u002B0x203/0x9b0  __unwind_start\u002B0x15d/0x1c0  arch_stack_walk\u002B0x62/0xf0  stack_trace_save\u002B0x48/0x70  __ftrace_trace_stack.constprop.0\u002B0x144/0x180  trace_buffer_unlock_commit_regs\u002B0x6d/0x220  trace_event_buffer_commit\u002B0x5c/0x260  trace_event_raw_event_softirq\u002B0x47/0x80  raise_softirq_irqoff\u002B0x6e/0xa0  rcu_read_unlock_special\u002B0xb1/0x160  unwind_next_frame\u002B0x203/0x9b0  __unwind_start\u002B0x15d/0x1c0  arch_stack_walk\u002B0x62/0xf0  stack_trace_save\u002B0x48/0x70  __ftrace_trace_stack.constprop.0\u002B0x144/0x180  trace_buffer_unlock_commit_regs\u002B0x6d/0x220  trace_event_buffer_commit\u002B0x5c/0x260  trace_event_raw_event_softirq\u002B0x47/0x80  raise_softirq_irqoff\u002B0x6e/0xa0  rcu_read_unlock_special\u002B0xb1/0x160  __is_insn_slot_addr\u002B0x54/0x70  kernel_text_address\u002B0x48/0xc0  __kernel_text_address\u002B0xd/0x40  unwind_get_return_address\u002B0x1e/0x40  arch_stack_walk\u002B0x9c/0xf0  stack_trace_save\u002B0x48/0x70  __ftrace_trace_stack.constprop.0\u002B0x144/0x180  trace_buffer_unlock_commit_regs\u002B0x6d/0x220  trace_event_buffer_commit\u002B0x5c/0x260  trace_event_raw_event_softirq\u002B0x47/0x80  __raise_softirq_irqoff\u002B0x61/0x80  __flush_smp_call_function_queue\u002B0x115/0x420  __sysvec_call_function_single\u002B0x17/0xb0  sysvec_call_function_single\u002B0x8c/0xc0  \u003C/IRQ\u003E  Commit b41642c87716 (\u0022rcu: Fix rcu_read_unlock() deadloop due to IRQ work\u0022) fixed the infinite loop in rcu_read_unlock_special() for IRQ work by setting a flag before calling irq_work_queue_on(). We fix this issue by setting the same flag before calling raise_softirq_irqoff() and rename the flag to defer_qs_pending for more common.",
  "published": "2026-03-30T09:00:00Z",
  "severity": "high",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00126,
  "epssPercentile": 0.02261,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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