{"cve":"CVE-2022-50369","nvd":{"published":"2025-09-17T15:15:35.830","modified":"2026-06-17T05:23:21.190","status":"Modified","description":"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().","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/0b8f390e2251191f1b179cc87f65d54c96565f0d","https://git.kernel.org/stable/c/1f9836f95271e7acf016667eee0aeae3386f9645","https://git.kernel.org/stable/c/2fe2a8f40c21161ffe7653cc234e7934db5b7cc5","https://git.kernel.org/stable/c/57031c474c3a920ea73afeb5dc352e537f5793ee","https://git.kernel.org/stable/c/596f1ba3987e601e31a5abf1f75ce1d2635aceac"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:10:08.713834912+00:00"},"epss":{"cve":"CVE-2022-50369","score":0.00202,"percentile":0.10164,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}