{"id":"CVE-2026-89823","summary":"drm: fix race between partial drm_dev_register() failure and ioctl","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: fix race between partial drm_dev_register() failure and ioctl\n\nIf drm_dev_register() fails after registering a minor (e.g. render minor\nregistered, primary minor fails), userspace could have opened the first\nminor and entered a drm_dev_enter() critical section. Since the\nunplugged flag was never set, the ioctl proceeds while the error path\ntears down device resources.\n\nFix this by introducing drm_dev_synchronize_unplug(), which sets the\nunplugged flag and waits for the SRCU barrier, ensuring all in-flight\ndrm_dev_enter() critical sections complete before cleanup proceeds; call\nit on the error path of drm_dev_register().","modified":"2026-09-18T03:48:33.242618021Z","published":"2026-09-16T10:30:55.534Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89823.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/19dbfe4d586aecfed121cb3fa62281761d9d341f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/24d28d15c0f7f7d4a1c229f8730314f0f8758810"},{"type":"WEB","url":"https://git.kernel.org/stable/c/26d9162213952927cd59c0d94b7e0e992b347bec"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2d1215a72159d00001e08dee162e27718934bee9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6729990df9e70623bf53f855b521ae71ca9cb278"},{"type":"WEB","url":"https://git.kernel.org/stable/c/79d09cfe90304ff4f195e47d569800f5e0f8b854"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89823.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89823"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bee330f3d67273a68dcb99f59480d59553c008b2"},{"fixed":"26d9162213952927cd59c0d94b7e0e992b347bec"},{"fixed":"24d28d15c0f7f7d4a1c229f8730314f0f8758810"},{"fixed":"6729990df9e70623bf53f855b521ae71ca9cb278"},{"fixed":"a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c"},{"fixed":"19dbfe4d586aecfed121cb3fa62281761d9d341f"},{"fixed":"79d09cfe90304ff4f195e47d569800f5e0f8b854"},{"fixed":"2d1215a72159d00001e08dee162e27718934bee9"},{"fixed":"eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89823.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.18.0"},{"fixed":"5.10.270"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.221"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.51"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89823.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:H/I:H/A:H"}]}