{"id":"DEBIAN-CVE-2022-50369","details":"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-\u003eoutput.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:   \u003cTASK\u003e   ? 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().","modified":"2026-09-01T16:05:35.001714181Z","published":"2025-09-17T15:15:35.830Z","upstream":["CVE-2022-50369"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-50369"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.20-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50369.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.20-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50369.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.20-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50369.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}