cbcvebase.
CVE-2022-50369
published 2025-09-17

CVE-2022-50369: 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…

PriorityP418medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.18%
8.2th percentile
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

15 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.20-1 (bookworm)linux 6.1.20-1 (bookworm)
linuxlinux——
linuxlinux>= 6c234fe37c57627a5baf96f552afa1fae2b67d4d < 0b8f390e2251191f1b179cc87f65d54c96565f0d0b8f390e2251191f1b179cc87f65d54c96565f0d
linuxlinux>= 6c234fe37c57627a5baf96f552afa1fae2b67d4d < 1f9836f95271e7acf016667eee0aeae3386f96451f9836f95271e7acf016667eee0aeae3386f9645
linuxlinux>= 6c234fe37c57627a5baf96f552afa1fae2b67d4d < 596f1ba3987e601e31a5abf1f75ce1d2635aceac596f1ba3987e601e31a5abf1f75ce1d2635aceac
linuxlinux>= 6c234fe37c57627a5baf96f552afa1fae2b67d4d < 57031c474c3a920ea73afeb5dc352e537f5793ee57031c474c3a920ea73afeb5dc352e537f5793ee
linuxlinux>= 6c234fe37c57627a5baf96f552afa1fae2b67d4d < 2fe2a8f40c21161ffe7653cc234e7934db5b7cc52fe2a8f40c21161ffe7653cc234e7934db5b7cc5
linuxlinux_kernel>= 0 < 5.10.178-15.10.178-1
linuxlinux_kernel>= 0 < 6.1.20-16.1.20-1
linuxlinux_kernel>= 0 < 6.1.20-16.1.20-1
linuxlinux_kernel>= 0 < 6.1.20-16.1.20-1
linuxlinux_kernel>= 4.20 < 5.10.1735.10.173
linuxlinux_kernel>= 5.11 < 5.15.995.15.99
linuxlinux_kernel>= 5.16 < 6.1.166.1.16
linuxlinux_kernel>= 6.2 < 6.2.36.2.3

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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