{"id":"CVE-2022-50369","state":"PUBLISHED","title":"drm/vkms: Fix null-ptr-deref in vkms_release()","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().","publishedAt":"2025-09-17T14:56:24.889Z","updatedAt":"2026-05-11T19:18:13.484Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6c234fe37c57627a5baf96f552afa1fae2b67d4d","status":"affected","lessThan":"0b8f390e2251191f1b179cc87f65d54c96565f0d","versionType":"git"},{"version":"6c234fe37c57627a5baf96f552afa1fae2b67d4d","status":"affected","lessThan":"1f9836f95271e7acf016667eee0aeae3386f9645","versionType":"git"},{"version":"6c234fe37c57627a5baf96f552afa1fae2b67d4d","status":"affected","lessThan":"596f1ba3987e601e31a5abf1f75ce1d2635aceac","versionType":"git"},{"version":"6c234fe37c57627a5baf96f552afa1fae2b67d4d","status":"affected","lessThan":"57031c474c3a920ea73afeb5dc352e537f5793ee","versionType":"git"},{"version":"6c234fe37c57627a5baf96f552afa1fae2b67d4d","status":"affected","lessThan":"2fe2a8f40c21161ffe7653cc234e7934db5b7cc5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/vkms/vkms_drv.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"5.10.173","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.99","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.16","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.3","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/vkms/vkms_drv.c"]}],"references":["https://git.kernel.org/stable/c/0b8f390e2251191f1b179cc87f65d54c96565f0d","https://git.kernel.org/stable/c/1f9836f95271e7acf016667eee0aeae3386f9645","https://git.kernel.org/stable/c/596f1ba3987e601e31a5abf1f75ce1d2635aceac","https://git.kernel.org/stable/c/57031c474c3a920ea73afeb5dc352e537f5793ee","https://git.kernel.org/stable/c/2fe2a8f40c21161ffe7653cc234e7934db5b7cc5"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/50xxx/CVE-2022-50369.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50369","state":"PUBLISHED","datePublished":"2025-09-17T14:56:24.889Z","dateUpdated":"2026-05-11T19:18:13.484Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-09-17T14:53:06.995Z"},"containers":{"cna":{"title":"drm/vkms: Fix null-ptr-deref in vkms_release()","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->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()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6c234fe37c57627a5baf96f552afa1fae2b67d4d","status":"affected","lessThan":"0b8f390e2251191f1b179cc87f65d54c96565f0d","versionType":"git"},{"version":"6c234fe37c57627a5baf96f552afa1fae2b67d4d","status":"affected","lessThan":"1f9836f95271e7acf016667eee0aeae3386f9645","versionType":"git"},{"version":"6c234fe37c57627a5baf96f552afa1fae2b67d4d","status":"affected","lessThan":"596f1ba3987e601e31a5abf1f75ce1d2635aceac","versionType":"git"},{"version":"6c234fe37c57627a5baf96f552afa1fae2b67d4d","status":"affected","lessThan":"57031c474c3a920ea73afeb5dc352e537f5793ee","versionType":"git"},{"version":"6c234fe37c57627a5baf96f552afa1fae2b67d4d","status":"affected","lessThan":"2fe2a8f40c21161ffe7653cc234e7934db5b7cc5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/vkms/vkms_drv.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"5.10.173","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.99","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.16","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.3","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/vkms/vkms_drv.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0b8f390e2251191f1b179cc87f65d54c96565f0d"},{"url":"https://git.kernel.org/stable/c/1f9836f95271e7acf016667eee0aeae3386f9645"},{"url":"https://git.kernel.org/stable/c/596f1ba3987e601e31a5abf1f75ce1d2635aceac"},{"url":"https://git.kernel.org/stable/c/57031c474c3a920ea73afeb5dc352e537f5793ee"},{"url":"https://git.kernel.org/stable/c/2fe2a8f40c21161ffe7653cc234e7934db5b7cc5"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:18:13.484Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.10.173"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.15.99"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.1.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.2.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2022-50369","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-01-14T18:35:42.545980Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","type":"CWE","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-14T18:42:59.660Z"}}]}}}