{"id":"CVE-2026-90188","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnull_blk: free global tag_set on init error path\n\nIf shared_tags is enabled, null_setup_tagset() allocates the global tag_set\nvia null_init_global_tag_set()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnull_blk: free global tag_set on init error path\n\nIf shared_tags is enabled, null_setup_tagset() allocates the global tag_set\nvia null_init_global_tag_set(). If device …","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 82f402fefa50f1675bf918bcd009981bd6b30ac8 < 0b2faa330184340d9418ad2c627c2ae881772e33","Linux >= 82f402fefa50f1675bf918bcd009981bd6b30ac8 < 665c94554ff0d5d88caae7f40c16c8e0a3369eda","Linux >= 82f402fefa50f1675bf918bcd009981bd6b30ac8 < 2882e1450fa4597811a951196e07553ea134eb31","Linux >= 82f402fefa50f1675bf918bcd009981bd6b30ac8 < 2b59484ac1e64dd78dbe8c6140891c6308085a75","Linux >= 82f402fefa50f1675bf918bcd009981bd6b30ac8 < 081cf37e8a0e00cd91d6df53172c9d928790a798","Linux >= 82f402fefa50f1675bf918bcd009981bd6b30ac8 < 5a1c5ff3a49ba93a1fd0b70537e7a0164071760d","Linux 4.13"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:13.397","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90188","references":[{"url":"https://git.kernel.org/stable/c/081cf37e8a0e00cd91d6df53172c9d928790a798","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0b2faa330184340d9418ad2c627c2ae881772e33","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2882e1450fa4597811a951196e07553ea134eb31","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2b59484ac1e64dd78dbe8c6140891c6308085a75","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5a1c5ff3a49ba93a1fd0b70537e7a0164071760d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/665c94554ff0d5d88caae7f40c16c8e0a3369eda","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90188.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90188"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536266"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90188"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90188"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90188.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-17T16:21:47.864Z","epss":0.00206,"epssPercentile":0.10514,"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-2026-90188","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnull_blk: free global tag_set on init error path\n\nIf shared_tags is enabled, null_setup_tagset() allocates the global tag_set\nvia null_init_global_tag_set(). If device creation later fails, err_dev\ndestroys the default devices and calls unregister_blkdev(), but never frees\nthe global tag_set. Since module init failed, null_exit() is never invoked,\nso the global tag_set's tags and maps are permanently leaked.\n\nFree the global tag_set in err_dev, matching null_exit() which does\nif (tag_set.ops) blk_mq_free_tag_set(&tag_set).\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 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-05 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90188.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":216273,"id":"CVE-2026-90188","ts":1791274054247,"field":"cvss","old":null,"new":"5.5"},{"seq":216272,"id":"CVE-2026-90188","ts":1791274054247,"field":"severity","old":"none","new":"medium"}]}