{
  "cveId": "CVE-2026-23088",
  "url": "https://patchblox.com/security/cve/CVE-2026-23088",
  "summary": "CVE-2026-23088 is fixed in 51 products on 1 platform, first by DEBIAN-CVE-2026-23088, released February 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  tracing: Fix crash on synthetic stacktrace field...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  tracing: Fix crash on synthetic stacktrace field usage  When creating a synthetic event based on an existing synthetic event that had a stacktrace field and the new synthetic event used that field a kernel crash occurred:   ~# cd /sys/kernel/tracing  ~# echo \u0027s:stack unsigned long stack[];\u0027 \u003E dynamic_events  ~# echo \u0027hist:keys=prev_pid:s0=common_stacktrace if prev_state \u0026 3\u0027 \u003E\u003E events/sched/sched_switch/trigger  ~# echo \u0027hist:keys=next_pid:s1=$s0:onmatch(sched.sched_switch).trace(stack,$s1)\u0027 \u003E\u003E events/sched/sched_switch/trigger  The above creates a synthetic event that takes a stacktrace when a task schedules out in a non-running state and passes that stacktrace to the sched_switch event when that task schedules back in. It triggers the \u0022stack\u0022 synthetic event that has a stacktrace as its field (called \u0022stack\u0022).   ~# echo \u0027s:syscall_stack s64 id; unsigned long stack[];\u0027 \u003E\u003E dynamic_events  ~# echo \u0027hist:keys=common_pid:s2=stack\u0027 \u003E\u003E events/synthetic/stack/trigger  ~# echo \u0027hist:keys=common_pid:s3=$s2,i0=id:onmatch(synthetic.stack).trace(syscall_stack,$i0,$s3)\u0027 \u003E\u003E events/raw_syscalls/sys_exit/trigger  The above makes another synthetic event called \u0022syscall_stack\u0022 that attaches the first synthetic event (stack) to the sys_exit trace event and records the stacktrace from the stack event with the id of the system call that is exiting.  When enabling this event (or using it in a historgram):   ~# echo 1 \u003E events/synthetic/syscall_stack/enable  Produces a kernel crash!   BUG: unable to handle page fault for address: 0000000000400010  #PF: supervisor read access in kernel mode  #PF: error_code(0x0000) - not-present page  PGD 0 P4D 0  Oops: Oops: 0000 [#1] SMP PTI  CPU: 6 UID: 0 PID: 1257 Comm: bash Not tainted 6.16.3\u002Bdeb14-amd64 #1 PREEMPT(lazy)  Debian 6.16.3-1  Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS 1.17.0-debian-1.17.0-1 04/01/2014  RIP: 0010:trace_event_raw_event_synth\u002B0x90/0x380  Code: c5 00 00 00 00 85 d2 0f 84 e1 00 00 00 31 db eb 34 0f 1f 00 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 \u003C49\u003E 8b 04 24 48 83 c3 01 8d 0c c5 08 00 00 00 01 cd 41 3b 5d 40 0f  RSP: 0018:ffffd2670388f958 EFLAGS: 00010202  RAX: ffff8ba1065cc100 RBX: 0000000000000000 RCX: 0000000000000000  RDX: 0000000000000001 RSI: fffff266ffda7b90 RDI: ffffd2670388f9b0  RBP: 0000000000000010 R08: ffff8ba104e76000 R09: ffffd2670388fa50  R10: ffff8ba102dd42e0 R11: ffffffff9a908970 R12: 0000000000400010  R13: ffff8ba10a246400 R14: ffff8ba10a710220 R15: fffff266ffda7b90  FS:  00007fa3bc63f740(0000) GS:ffff8ba2e0f48000(0000) knlGS:0000000000000000  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033  CR2: 0000000000400010 CR3: 0000000107f9e003 CR4: 0000000000172ef0  Call Trace:   \u003CTASK\u003E   ? __tracing_map_insert\u002B0x208/0x3a0   action_trace\u002B0x67/0x70   event_hist_trigger\u002B0x633/0x6d0   event_triggers_call\u002B0x82/0x130   trace_event_buffer_commit\u002B0x19d/0x250   trace_event_raw_event_sys_exit\u002B0x62/0xb0   syscall_exit_work\u002B0x9d/0x140   do_syscall_64\u002B0x20a/0x2f0   ? trace_event_raw_event_sched_switch\u002B0x12b/0x170   ? save_fpregs_to_fpstate\u002B0x3e/0x90   ? _raw_spin_unlock\u002B0xe/0x30   ? finish_task_switch.isra.0\u002B0x97/0x2c0   ? __rseq_handle_notify_resume\u002B0xad/0x4c0   ? __schedule\u002B0x4b8/0xd00   ? restore_fpregs_from_fpstate\u002B0x3c/0x90   ? switch_fpu_return\u002B0x5b/0xe0   ? do_syscall_64\u002B0x1ef/0x2f0   ? do_fault\u002B0x2e9/0x540   ? __handle_mm_fault\u002B0x7d1/0xf70   ? count_memcg_events\u002B0x167/0x1d0   ? handle_mm_fault\u002B0x1d7/0x2e0   ? do_user_addr_fault\u002B0x2c3/0x7f0   entry_SYSCALL_64_after_hwframe\u002B0x76/0x7e  The reason is that the stacktrace field is not labeled as such, and is treated as a normal field and not as a dynamic event that it is.  In trace_event_raw_event_synth() the event is field is still treated as a dynamic array, but the retrieval of the data is considered a normal field, and the reference is just the meta data:  // Meta data is retrieved instead of a dynamic array ---truncated---",
  "published": "2026-02-04T17:16:19Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00146,
  "epssPercentile": 0.03862,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "fix": "SUSE-SU-2026:1081-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-1081-1",
      "released": "2026-03-26T13:23:51Z"
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    {
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      "product": "kernel-zfcpdump",
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      "fix": "SUSE-SU-2026:20931-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-20931-1",
      "released": "2026-03-25T08:48:43Z"
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    {
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      "released": "2026-02-04T17:16:19Z"
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    {
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      "released": "2026-02-04T17:16:19Z"
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  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}