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CVE-2026-23088

Estado: AnalizadaMedia (5.5)—

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 's:stack unsigned long stack[];' > dynamic_events ~# echo 'hist:keys=prev_pid:s0=common_stacktrace if prev_state & 3' >> events/sched/sched_switch/trigger ~# echo 'hist:keys=next_pid:s1=$s0:onmatch(sched.sched_switch).trace(stack,$s1)' >> 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.

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It triggers the "stack" synthetic event that has a stacktrace as its field (called "stack").

~# echo 's:syscall_stack s64 id; unsigned long stack[];' >> dynamic_events ~# echo 'hist:keys=common_pid:s2=stack' >> events/synthetic/stack/trigger ~# echo 'hist:keys=common_pid:s3=$s2,i0=id:onmatch(synthetic.stack).trace(syscall_stack,$i0,$s3)' >> events/raw_syscalls/sys_exit/trigger

The above makes another synthetic event called "syscall_stack" 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 > events/synthetic/syscall_stack/enable

Produces a kernel crash!

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---

Detalles técnicos trazas, registros y código del informe original
 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+deb14-amd64 #1 PREEMPT(lazy)  Debian 6.16.3-1
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-debian-1.17.0-1 04/01/2014
 RIP: 0010:trace_event_raw_event_synth+0x90/0x380
 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 <49> 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:
  <TASK>
  ? __tracing_map_insert+0x208/0x3a0
  action_trace+0x67/0x70
  event_hist_trigger+0x633/0x6d0
  event_triggers_call+0x82/0x130
  trace_event_buffer_commit+0x19d/0x250
  trace_event_raw_event_sys_exit+0x62/0xb0
  syscall_exit_work+0x9d/0x140
  do_syscall_64+0x20a/0x2f0
  ? trace_event_raw_event_sched_switch+0x12b/0x170
  ? save_fpregs_to_fpstate+0x3e/0x90
  ? _raw_spin_unlock+0xe/0x30
  ? finish_task_switch.isra.0+0x97/0x2c0
  ? __rseq_handle_notify_resume+0xad/0x4c0
  ? __schedule+0x4b8/0xd00
  ? restore_fpregs_from_fpstate+0x3c/0x90
  ? switch_fpu_return+0x5b/0xe0
  ? do_syscall_64+0x1ef/0x2f0
  ? do_fault+0x2e9/0x540
  ? __handle_mm_fault+0x7d1/0xf70
  ? count_memcg_events+0x167/0x1d0
  ? handle_mm_fault+0x1d7/0x2e0
  ? do_user_addr_fault+0x2c3/0x7f0
  entry_SYSCALL_64_after_hwframe+0x76/0x7e

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-23088",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
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          "vendor": "Linux",
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          "versions": [
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              "status": "affected",
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            {
              "status": "affected",
              "version": "6.1.43",
              "lessThan": "6.2",
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            }
          ],
          "programFiles": [
            "kernel/trace/trace_events_hist.c",
            "kernel/trace/trace_events_synth.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.3",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.122",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
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              "version": "6.12.68",
              "versionType": "semver",
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            {
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            {
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
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            "kernel/trace/trace_events_synth.c"
          ],
          "defaultStatus": "affected"
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      ]
    }
  ],
  "published": "2026-02-04T17:16:19.673",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/327af07dff6ab5650b21491eb4f69694999ff3d1",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3b90d099efa2b67239bd3b3dc3521ec584261748",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/90f9f5d64cae4e72defd96a2a22760173cb3c9ec",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/98ecbfb2598c9c7ca755a29f402da9d36c057077",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix crash on synthetic stacktrace field usage\n\nWhen creating a synthetic event based on an existing synthetic event that\nhad a stacktrace field and the new synthetic event used that field a\nkernel crash occurred:\n\n ~# cd /sys/kernel/tracing\n ~# echo 's:stack unsigned long stack[];' > dynamic_events\n ~# echo 'hist:keys=prev_pid:s0=common_stacktrace if prev_state & 3' >> events/sched/sched_switch/trigger\n ~# echo 'hist:keys=next_pid:s1=$s0:onmatch(sched.sched_switch).trace(stack,$s1)' >> events/sched/sched_switch/trigger\n\nThe above creates a synthetic event that takes a stacktrace when a task\nschedules out in a non-running state and passes that stacktrace to the\nsched_switch event when that task schedules back in. It triggers the\n\"stack\" synthetic event that has a stacktrace as its field (called \"stack\").\n\n ~# echo 's:syscall_stack s64 id; unsigned long stack[];' >> dynamic_events\n ~# echo 'hist:keys=common_pid:s2=stack' >> events/synthetic/stack/trigger\n ~# echo 'hist:keys=common_pid:s3=$s2,i0=id:onmatch(synthetic.stack).trace(syscall_stack,$i0,$s3)' >> events/raw_syscalls/sys_exit/trigger\n\nThe above makes another synthetic event called \"syscall_stack\" that\nattaches the first synthetic event (stack) to the sys_exit trace event and\nrecords the stacktrace from the stack event with the id of the system call\nthat is exiting.\n\nWhen enabling this event (or using it in a historgram):\n\n ~# echo 1 > events/synthetic/syscall_stack/enable\n\nProduces a kernel crash!\n\n BUG: unable to handle page fault for address: 0000000000400010\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: Oops: 0000 [#1] SMP PTI\n CPU: 6 UID: 0 PID: 1257 Comm: bash Not tainted 6.16.3+deb14-amd64 #1 PREEMPT(lazy)  Debian 6.16.3-1\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\n RIP: 0010:trace_event_raw_event_synth+0x90/0x380\n 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 <49> 8b 04 24 48 83 c3 01 8d 0c c5 08 00 00 00 01 cd 41 3b 5d 40 0f\n RSP: 0018:ffffd2670388f958 EFLAGS: 00010202\n RAX: ffff8ba1065cc100 RBX: 0000000000000000 RCX: 0000000000000000\n RDX: 0000000000000001 RSI: fffff266ffda7b90 RDI: ffffd2670388f9b0\n RBP: 0000000000000010 R08: ffff8ba104e76000 R09: ffffd2670388fa50\n R10: ffff8ba102dd42e0 R11: ffffffff9a908970 R12: 0000000000400010\n R13: ffff8ba10a246400 R14: ffff8ba10a710220 R15: fffff266ffda7b90\n FS:  00007fa3bc63f740(0000) GS:ffff8ba2e0f48000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000400010 CR3: 0000000107f9e003 CR4: 0000000000172ef0\n Call Trace:\n  <TASK>\n  ? __tracing_map_insert+0x208/0x3a0\n  action_trace+0x67/0x70\n  event_hist_trigger+0x633/0x6d0\n  event_triggers_call+0x82/0x130\n  trace_event_buffer_commit+0x19d/0x250\n  trace_event_raw_event_sys_exit+0x62/0xb0\n  syscall_exit_work+0x9d/0x140\n  do_syscall_64+0x20a/0x2f0\n  ? trace_event_raw_event_sched_switch+0x12b/0x170\n  ? save_fpregs_to_fpstate+0x3e/0x90\n  ? _raw_spin_unlock+0xe/0x30\n  ? finish_task_switch.isra.0+0x97/0x2c0\n  ? __rseq_handle_notify_resume+0xad/0x4c0\n  ? __schedule+0x4b8/0xd00\n  ? restore_fpregs_from_fpstate+0x3c/0x90\n  ? switch_fpu_return+0x5b/0xe0\n  ? do_syscall_64+0x1ef/0x2f0\n  ? do_fault+0x2e9/0x540\n  ? __handle_mm_fault+0x7d1/0xf70\n  ? count_memcg_events+0x167/0x1d0\n  ? handle_mm_fault+0x1d7/0x2e0\n  ? do_user_addr_fault+0x2c3/0x7f0\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe reason is that the stacktrace field is not labeled as such, and is\ntreated as a normal field and not as a dynamic event that it is.\n\nIn trace_event_raw_event_synth() the event is field is still treated as a\ndynamic array, but the retrieval of the data is considered a normal field,\nand the reference is just the meta data:\n\n// Meta data is retrieved instead of a dynamic array\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:  tracing: Corrección de un fallo al usar un campo de rastreo de pila sintético  Al crear un evento sintético basado en un evento sintético existente que tenía un campo de rastreo de pila y el nuevo evento sintético usaba ese campo, ocurrió un fallo del kernel:   ~# cd /sys/kernel/tracing  ~# echo 's:stack unsigned long stack[];' &gt; dynamic_events  ~# echo 'hist:keys=prev_pid:s0=common_stacktrace if prev_state &amp; 3' &gt;&gt; events/sched/sched_switch/trigger  ~# echo 'hist:keys=next_pid:s1=$s0:onmatch(sched.sched_switch).trace(stack,$s1)' &gt;&gt; events/sched/sched_switch/trigger  Lo anterior crea un evento sintético que toma un rastreo de pila cuando una tarea se desprograma en un estado no en ejecución y pasa ese rastreo de pila al evento sched_switch cuando esa tarea se vuelve a programar. Activa el evento sintético 'stack' que tiene un rastreo de pila como su campo (llamado 'stack').   ~# echo 's:syscall_stack s64 id; unsigned long stack[];' &gt;&gt; dynamic_events  ~# echo 'hist:keys=common_pid:s2=stack' &gt;&gt; events/synthetic/stack/trigger  ~# echo 'hist:keys=common_pid:s3=$s2,i0=id:onmatch(synthetic.stack).trace(syscall_stack,$i0,$s3)' &gt;&gt; events/raw_syscalls/sys_exit/trigger  Lo anterior crea otro evento sintético llamado 'syscall_stack' que adjunta el primer evento sintético (stack) al evento de rastreo sys_exit y registra el rastreo de pila del evento stack con el ID de la llamada al sistema que está saliendo.  Al habilitar este evento (o al usarlo en un histograma):   ~# echo 1 &gt; events/synthetic/syscall_stack/enable  ¡Produce un fallo del kernel!   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+deb14-amd64 #1 PREEMPT(lazy) Debian 6.16.3-1  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-debian-1.17.0-1 04/01/2014  RIP: 0010:trace_event_raw_event_synth+0x90/0x380  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 &lt;49&gt; 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:      ? __tracing_map_insert+0x208/0x3a0   action_trace+0x67/0x70   event_hist_trigger+0x633/0x6d0   event_triggers_call+0x82/0x130   trace_event_buffer_commit+0x19d/0x250   trace_event_raw_event_sys_exit+0x62/0xb0   syscall_exit_work+0x9d/0x140   do_syscall_64+0x20a/0x2f0   ? trace_event_raw_event_sched_switch+0x12b/0x170   ? save_fpregs_to_fpstate+0x3e/0x90   ? _raw_spin_unlock+0xe/0x30   ? finish_task_switch.isra.0+0x97/0x2c0   ? __rseq_handle_notify_resume+0xad/0x4c0   ? __schedule+0x4b8/0xd00   ? restore_fpregs_from_fpstate+0x3c/0x90   ? switch_fpu_return+0x5b/0xe0   ? do_syscall_64+0x1ef/0x2f0   ? do_fault+0x2e9/0x540   ? __handle_mm_fault+0x7d1/0xf70   ? count_memcg_events+0x167/0x1d0   ? handle_mm_fault+0x1d7/0x2e0   ? do_user_addr_fault+0x2c3/0x7f0   entry_SYSCALL_64_after_hwframe+0x76/0x7e  La razón es que el campo de rastreo de pila no está etiquetado como tal, y es tratado como un campo normal y no como un evento dinámico, que es lo que es.  En trace_event_raw_ev"
    }
  ],
  "lastModified": "2026-06-17T10:20:50.780",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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