{"id":"CVE-2026-89823","title":"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","summary":"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 f…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 < 26d9162213952927cd59c0d94b7e0e992b347bec","Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 < 24d28d15c0f7f7d4a1c229f8730314f0f8758810","Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 < 6729990df9e70623bf53f855b521ae71ca9cb278","Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 < a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c","Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 < 19dbfe4d586aecfed121cb3fa62281761d9d341f","Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 < 79d09cfe90304ff4f195e47d569800f5e0f8b854","Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 < 2d1215a72159d00001e08dee162e27718934bee9","Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 < eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e","Linux 4.18"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:11.300","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89823","references":[{"url":"https://git.kernel.org/stable/c/19dbfe4d586aecfed121cb3fa62281761d9d341f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/24d28d15c0f7f7d4a1c229f8730314f0f8758810","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/26d9162213952927cd59c0d94b7e0e992b347bec","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2d1215a72159d00001e08dee162e27718934bee9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6729990df9e70623bf53f855b521ae71ca9cb278","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/79d09cfe90304ff4f195e47d569800f5e0f8b854","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:54.002Z","epss":0.00164,"epssPercentile":0.06015,"slug":"CVE-2026-89823","body":"## Overview\n\nIn 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().\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205222,"id":"CVE-2026-89823","ts":1789570705801,"field":"cvss","old":null,"new":"7.8"},{"seq":205221,"id":"CVE-2026-89823","ts":1789570705801,"field":"severity","old":"none","new":"high"}]}