ghsa-fv67-488v-7h86
Vulnerability from github
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: ? 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().
{ "affected": [], "aliases": [ "CVE-2022-50369" ], "database_specific": { "cwe_ids": [], "github_reviewed": false, "github_reviewed_at": null, "nvd_published_at": "2025-09-17T15:15:35Z", "severity": null }, "details": "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().", "id": "GHSA-fv67-488v-7h86", "modified": "2025-09-17T15:30:38Z", "published": "2025-09-17T15:30:38Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50369" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/0b8f390e2251191f1b179cc87f65d54c96565f0d" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/1f9836f95271e7acf016667eee0aeae3386f9645" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/2fe2a8f40c21161ffe7653cc234e7934db5b7cc5" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/57031c474c3a920ea73afeb5dc352e537f5793ee" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/596f1ba3987e601e31a5abf1f75ce1d2635aceac" } ], "schema_version": "1.4.0", "severity": [] }
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