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CVE-2022-50369

Estado: ModificadaMedia (5.5)—

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

drm/vkms: Fix null-ptr-deref in vkms_release()

A null-ptr-deref is triggered when it tries to destroy the workqueue in vkms->output.composer_workq in vkms_release().

The reason is that an OOM happened which triggers the destroy of the workqueue, however, the workqueue is alloced in the later process, thus a null-ptr-deref happened. A simple call graph is shown as below:

Fix this by checking if composer_workq is NULL before passing it to the destroy_workqueue() in vkms_release().

Detalles técnicos trazas, registros y código del informe original
 KASAN: null-ptr-deref in range [0x0000000000000118-0x000000000000011f]
 CPU: 5 PID: 17193 Comm: modprobe Not tainted 6.0.0-11331-gd465bff130bf #24
 RIP: 0010:destroy_workqueue+0x2f/0x710
 ...
 Call Trace:
  <TASK>
  ? vkms_config_debugfs_init+0x50/0x50 [vkms]
  __devm_drm_dev_alloc+0x15a/0x1c0 [drm]
  vkms_init+0x245/0x1000 [vkms]
  do_one_initcall+0xd0/0x4f0
  do_init_module+0x1a4/0x680
  load_module+0x6249/0x7110
  __do_sys_finit_module+0x140/0x200
  do_syscall_64+0x35/0x80
  entry_SYSCALL_64_after_hwframe+0x46/0xb0

 vkms_init()
  vkms_create()
    devm_drm_dev_alloc()
      __devm_drm_dev_alloc()
        devm_drm_dev_init()
          devm_add_action_or_reset()
            devm_add_action() # an error happened
            devm_drm_dev_init_release()
              drm_dev_put()
                kref_put()
                  drm_dev_release()
                    vkms_release()
                      destroy_workqueue() # null-ptr-deref happened
    vkms_modeset_init()
      vkms_output_init()
        vkms_crtc_init() # where the workqueue get allocated

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
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vkms: Fix null-ptr-deref in vkms_release()\n\nA null-ptr-deref is triggered when it tries to destroy the workqueue in\nvkms->output.composer_workq in vkms_release().\n\n KASAN: null-ptr-deref in range [0x0000000000000118-0x000000000000011f]\n CPU: 5 PID: 17193 Comm: modprobe Not tainted 6.0.0-11331-gd465bff130bf #24\n RIP: 0010:destroy_workqueue+0x2f/0x710\n ...\n Call Trace:\n  <TASK>\n  ? vkms_config_debugfs_init+0x50/0x50 [vkms]\n  __devm_drm_dev_alloc+0x15a/0x1c0 [drm]\n  vkms_init+0x245/0x1000 [vkms]\n  do_one_initcall+0xd0/0x4f0\n  do_init_module+0x1a4/0x680\n  load_module+0x6249/0x7110\n  __do_sys_finit_module+0x140/0x200\n  do_syscall_64+0x35/0x80\n  entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThe reason is that an OOM happened which triggers the destroy of the\nworkqueue, however, the workqueue is alloced in the later process,\nthus a null-ptr-deref happened. A simple call graph is shown as below:\n\n vkms_init()\n  vkms_create()\n    devm_drm_dev_alloc()\n      __devm_drm_dev_alloc()\n        devm_drm_dev_init()\n          devm_add_action_or_reset()\n            devm_add_action() # an error happened\n            devm_drm_dev_init_release()\n              drm_dev_put()\n                kref_put()\n                  drm_dev_release()\n                    vkms_release()\n                      destroy_workqueue() # null-ptr-deref happened\n    vkms_modeset_init()\n      vkms_output_init()\n        vkms_crtc_init() # where the workqueue get allocated\n\nFix this by checking if composer_workq is NULL before passing it to\nthe destroy_workqueue() in vkms_release()."
    }
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  "lastModified": "2026-06-17T05:23:21.190",
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