{"id":"CVE-2026-90215","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: ubi: Release device reference on busy detach\n\nubi_detach_mtd_dev() obtains a device reference through ubi_get_device()\nbefore checking whether the UBI device is bu…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: ubi: Release device reference on busy detach\n\nubi_detach_mtd_dev() obtains a device reference through ubi_get_device()\nbefore checking whether the UBI device is bu…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 7e84c961b2eb062d2f47037dcca52dcd1d3615b5 < 87812858c4c8df979cb70bcd0040b925a543df6f","Linux >= 7e84c961b2eb062d2f47037dcca52dcd1d3615b5 < e065960366b55ab21e6c643c30dec2a41451900b","Linux >= 7e84c961b2eb062d2f47037dcca52dcd1d3615b5 < 851c5e9a829d56cb0982965f07ef8966a6722884","Linux >= 7e84c961b2eb062d2f47037dcca52dcd1d3615b5 < 31dd710cd84d5dd63c49f640d3a9f36c9699ca95","Linux 6.9"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:16.790","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90215","references":[{"url":"https://git.kernel.org/stable/c/31dd710cd84d5dd63c49f640d3a9f36c9699ca95","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/851c5e9a829d56cb0982965f07ef8966a6722884","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/87812858c4c8df979cb70bcd0040b925a543df6f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e065960366b55ab21e6c643c30dec2a41451900b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90215.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90215"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536511"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90215"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90215"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90215.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-17T16:21:47.856Z","epss":0.00168,"epssPercentile":0.06018,"cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-772"],"slug":"CVE-2026-90215","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmtd: ubi: Release device reference on busy detach\n\nubi_detach_mtd_dev() obtains a device reference through ubi_get_device()\nbefore checking whether the UBI device is busy. The busy return path drops\nubi->ref_count but leaves the device reference held, so the device object\ncannot be released after a later detach.\n\nDrop the device reference before returning -EBUSY.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-10-05 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90215.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":216324,"id":"CVE-2026-90215","ts":1791274073376,"field":"cvss","old":null,"new":"5.5"},{"seq":216323,"id":"CVE-2026-90215","ts":1791274073376,"field":"severity","old":"none","new":"medium"}]}