FKIE_CVE-2022-50369

Vulnerability from fkie_nvd - Published: 2025-09-17 15:15 - Updated: 2026-01-14 19:16
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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(). 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 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: 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 Fix this by checking if composer_workq is NULL before passing it to the destroy_workqueue() in vkms_release().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b8f390e2251191f1b179cc87f65d54c96565f0dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f9836f95271e7acf016667eee0aeae3386f9645Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2fe2a8f40c21161ffe7653cc234e7934db5b7cc5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/57031c474c3a920ea73afeb5dc352e537f5793eePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/596f1ba3987e601e31a5abf1f75ce1d2635aceacPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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-\u003eoutput.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  \u003cTASK\u003e\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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  "id": "CVE-2022-50369",
  "lastModified": "2026-01-14T19:16:09.897",
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