CVE-2024-50155

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

netdevsim: use cond_resched() in nsim_dev_trap_report_work()

I am still seeing many syzbot reports hinting that syzbot might fool nsim_dev_trap_report_work() with hundreds of ports [1]

Lets use cond_resched(), and system_unbound_wq instead of implicit system_wq.

Detalles técnicos trazas, registros y código del informe original

[1]
INFO: task syz-executor:20633 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:25856 pid:20633 tgid:20633 ppid:1      flags:0x00004006
...
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 16760 Comm: kworker/1:0 Not tainted 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events nsim_dev_trap_report_work
 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 89 fb e8 23 00 00 00 48 8b 3d 04 fb 9c 0c 48 89 de 5b e9 c3 c7 5d 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 c0 d7 03 00 65 8b 15 60 f0
RSP: 0018:ffffc90000a187e8 EFLAGS: 00000246
RAX: 0000000000000100 RBX: ffffc90000a188e0 RCX: ffff888027d3bc00
RDX: ffff888027d3bc00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88804a2e6000 R08: ffffffff8a4bc495 R09: ffffffff89da3577
R10: 0000000000000004 R11: ffffffff8a4bc2b0 R12: dffffc0000000000
R13: ffff88806573b503 R14: dffffc0000000000 R15: ffff8880663cca00
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc90a747f98 CR3: 000000000e734000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 000000000000002b DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
  __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382
  spin_unlock_bh include/linux/spinlock.h:396 [inline]
  nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline]
  nsim_dev_trap_report_work+0x75d/0xaa0 drivers/net/netdevsim/dev.c:850
  process_one_work kernel/workqueue.c:3229 [inline]
  process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
  worker_thread+0x870/0xd30 kernel/workqueue.c:3391
  kthread+0x2f0/0x390 kernel/kthread.c:389
  ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.23%
Percentil entre todas las CVEs puntuadas: 13
Fecha de la puntuación: 6/10/2026

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1499.004 Application or System Exploitationimpact65 %

Vulnerabilidad de negación de servicio en netdevsim del kernel Linux mediante bloqueo de trabajo indefinido (hung task). AV:L/PR:L permite escalada local; el ataque causa DoS del sistema (bloqueo de tareas).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

NVD-CWE-noinfo

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2024-50155",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "role": "CISA Coordinator",
          "options": [
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            },
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          "programFiles": [
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          ],
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        }
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetdevsim: use cond_resched() in nsim_dev_trap_report_work()\n\nI am still seeing many syzbot reports hinting that syzbot\nmight fool nsim_dev_trap_report_work() with hundreds of ports [1]\n\nLets use cond_resched(), and system_unbound_wq\ninstead of implicit system_wq.\n\n[1]\nINFO: task syz-executor:20633 blocked for more than 143 seconds.\n      Not tainted 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0\n\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\ntask:syz-executor    state:D stack:25856 pid:20633 tgid:20633 ppid:1      flags:0x00004006\n...\nNMI backtrace for cpu 1\nCPU: 1 UID: 0 PID: 16760 Comm: kworker/1:0 Not tainted 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\nWorkqueue: events nsim_dev_trap_report_work\n RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210\nCode: 89 fb e8 23 00 00 00 48 8b 3d 04 fb 9c 0c 48 89 de 5b e9 c3 c7 5d 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 c0 d7 03 00 65 8b 15 60 f0\nRSP: 0018:ffffc90000a187e8 EFLAGS: 00000246\nRAX: 0000000000000100 RBX: ffffc90000a188e0 RCX: ffff888027d3bc00\nRDX: ffff888027d3bc00 RSI: 0000000000000000 RDI: 0000000000000000\nRBP: ffff88804a2e6000 R08: ffffffff8a4bc495 R09: ffffffff89da3577\nR10: 0000000000000004 R11: ffffffff8a4bc2b0 R12: dffffc0000000000\nR13: ffff88806573b503 R14: dffffc0000000000 R15: ffff8880663cca00\nFS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007fc90a747f98 CR3: 000000000e734000 CR4: 00000000003526f0\nDR0: 0000000000000000 DR1: 000000000000002b DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400\nCall Trace:\n <NMI>\n </NMI>\n <TASK>\n  __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382\n  spin_unlock_bh include/linux/spinlock.h:396 [inline]\n  nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline]\n  nsim_dev_trap_report_work+0x75d/0xaa0 drivers/net/netdevsim/dev.c:850\n  process_one_work kernel/workqueue.c:3229 [inline]\n  process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310\n  worker_thread+0x870/0xd30 kernel/workqueue.c:3391\n  kthread+0x2f0/0x390 kernel/kthread.c:389\n  ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n </TASK>"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netdevsim: use cond_resched() en nsim_dev_trap_report_work() Todavía veo muchos informes de syzbot que insinúan que syzbot podría engañar a nsim_dev_trap_report_work() con cientos de puertos [1] Usemos cond_resched() y system_unbound_wq en lugar de system_wq implícito. [1] INFORMACIÓN: tarea syz-executor:20633 bloqueada durante más de 143 segundos. No contaminada 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0 \"echo 0 &gt; /proc/sys/kernel/hung_task_timeout_secs\" deshabilita este mensaje. tarea:syz-executor estado:D pila:25856 pid:20633 tgid:20633 ppid:1 indicadores:0x00004006 ... Seguimiento NMI para CPU 1 CPU: 1 UID: 0 PID: 16760 Comm: kworker/1:0 No contaminado 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 13/09/2024 Cola de trabajo: eventos nsim_dev_trap_report_work RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Código: 89 fb e8 23 00 00 00 48 8b 3d 04 fb 9c 0c 48 89 de 5b e9 c3 c7 5d 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90  0f 1e fa 48 8b 04 24 65 48 8b 0c 25 c0 d7 03 00 65 8b 15 60 f0 RSP: 0018:ffffc90000a187e8 EFLAGS: 00000246 RAX: 00000000000000100 RBX: ffffc90000a188e0 RCX: ffff888027d3bc00 RDX: ffff888027d3bc00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88804a2e6000 R08: ffffffff8a4bc495 R09: ffffffff89da3577 R10: 0000000000000004 R11: ffffffff8a4bc2b0 R12: dffffc0000000000 R13: ffff88806573b503 R14: dffffc0000000000 R15: ffff8880663cca00 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc90a747f98 CR3: 000000000e734000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 000000000000002b DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Seguimiento de llamadas:    __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382 spin_unlock_bh include/linux/spinlock.h:396 [en línea] nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [en línea] nsim_dev_trap_report_work+0x75d/0xaa0 drivers/net/netdevsim/dev.c:850 process_one_work kernel/workqueue.c:3229 [en línea] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 subproceso de trabajo+0x870/0xd30 kernel/workqueue.c:3391 subproceso de trabajo+0x2f0/0x390 kernel/kthread.c:389 ret_de_la_bifurcación+0x4b/0x80 arch/x86/kernel/process.c:147 ret_de_la_bifurcación_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 "
    }
  ],
  "lastModified": "2026-06-17T08:03:44.110",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "80209D88-BDC2-46A8-958C-8C3C2CB7A8DE",
              "versionEndExcluding": "6.1.115",
              "versionStartIncluding": "6.1.78"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "48CE9A35-DDD2-46CB-81AC-06D8D92D6DD2",
              "versionEndExcluding": "6.6.59",
              "versionStartIncluding": "6.6.17"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2CAA29A6-36B4-4C90-A862-A816F65153DB",
              "versionEndExcluding": "6.11.6",
              "versionStartIncluding": "6.8"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.7.5:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "32BD1A9C-5078-4672-8D42-E5BEDD8E13F1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7F361E1D-580F-4A2D-A509-7615F73167A1"
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              "vulnerable": true,
              "matchCriteriaId": "925478D0-3E3D-4E6F-ACD5-09F28D5DF82C"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3C95E234-D335-4B6C-96BF-E2CEBD8654ED"
            }
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          "operator": "OR"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}