CVE-2026-90189

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90189", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.792Z", "datePublished": "2026-09-17T16:07:10.992Z", "dateUpdated": "2026-10-19T08:59:25.945Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:59:25.945Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnull_blk: register configfs subsystem after creating default devices\n\nIn null_init(), configfs_register_subsystem() currently runs before\nregister_blkdev(), so when null_blk is built as a module, a racing mkdir()\n+ poweron from userspace can reach null_add_dev() while null_major is still\n0. __add_disk() then hits WARN_ON(disk->minors) (major=0 with minors!=0)\nand fails:\n\n[root@fedora ~]# [ 2366.521436] WARNING: block/genhd.c:476 at __add_disk+0x8a7/0xde0,\n[ 2366.523552] Modules linked in: null_blk(+) nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib\n[ 2366.529081] CPU: 26 UID: 0 PID: 1600 Comm: sh Not tainted 7.2.0-rc1+ #66 PREEMPT(full)\n......\n[ 2366.547251] Call Trace:\n[ 2366.547575] <TASK>\n[ 2366.547831] ? _raw_spin_lock+0x84/0xe0\n[ 2366.548260] add_disk_fwnode+0x114/0x560\n[ 2366.548739] null_add_dev+0x102d/0x1b80 [null_blk]\n[ 2366.549310] ? __pfx_null_add_dev+0x10/0x10 [null_blk]\n[ 2366.549906] ? mutex_lock+0xde/0x1c0\n[ 2366.550361] ? __pfx_mutex_lock+0x10/0x10\n[ 2366.550827] nullb_device_power_store+0x1e7/0x280 [null_blk]\n[ 2366.551499] ? __pfx_nullb_device_power_store+0x10/0x10 [null_blk]\n[ 2366.552177] ? __kmalloc_cache_noprof+0x1f5/0x470\n[ 2366.552748] ? configfs_write_iter+0x35c/0x4e0\n[ 2366.553242] configfs_write_iter+0x286/0x4e0\n[ 2366.553787] vfs_write+0x52d/0xd00\n[ 2366.554169] ? __pfx_vfs_write+0x10/0x10\n[ 2366.554679] ? __pfx___css_rstat_updated+0x10/0x10\n[ 2366.555196] ? fdget_pos+0x1cf/0x4c0\n[ 2366.555649] ksys_write+0xfc/0x1d0\n......\n\nAdditionally, the err_dev path destroys all devices on nullb_list while\nconfigfs is still registered. If a racing mkdir() + poweron puts a user\ndevice on the list, null_destroy_dev()->null_free_dev() kfrees the user\ndevice's nullb_device but /sys/kernel/config/nullb/<name> is still\nreachable. Any userspace access to the item will trigger a UAF.\n\nFor simplicity, move configfs_register_subsystem() to the end to solve\nthe problems above."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/block/null_blk/main.c"], "versions": [{"version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "lessThan": "2679b11e9256bd70a5ef41783bab6ad6c34a3db1", "status": "affected", "versionType": "git"}, {"version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "lessThan": "dbcedbe4819ae21274ea77469e61e46a878b9943", "status": "affected", "versionType": "git"}, {"version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "lessThan": "57debc907aef66319d244009d3370dcd97388d37", "status": "affected", "versionType": "git"}, {"version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "lessThan": "d761be1b8f2bbabc41252deb79a426d3f0d4fa10", "status": "affected", "versionType": "git"}, {"version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "lessThan": "cab9bf5f68f76cd44e0ec92bd4a60c9b83656a36", "status": "affected", "versionType": "git"}, {"version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "lessThan": "c9d293d6bb0575fcb1f3408129453187e2a28a4e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/block/null_blk/main.c"], "versions": [{"version": "4.14", "status": "affected"}, {"version": "0", "lessThan": "4.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2679b11e9256bd70a5ef41783bab6ad6c34a3db1"}, {"url": "https://git.kernel.org/stable/c/dbcedbe4819ae21274ea77469e61e46a878b9943"}, {"url": "https://git.kernel.org/stable/c/57debc907aef66319d244009d3370dcd97388d37"}, {"url": "https://git.kernel.org/stable/c/d761be1b8f2bbabc41252deb79a426d3f0d4fa10"}, {"url": "https://git.kernel.org/stable/c/cab9bf5f68f76cd44e0ec92bd4a60c9b83656a36"}, {"url": "https://git.kernel.org/stable/c/c9d293d6bb0575fcb1f3408129453187e2a28a4e"}], "title": "null_blk: register configfs subsystem after creating default devices", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/block/null_blk/main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2679b11e9256bd70a5ef41783bab6ad6c34a3db1", "status": "affected", "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "versionType": "git"}, {"lessThan": "dbcedbe4819ae21274ea77469e61e46a878b9943", "status": "affected", "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "versionType": "git"}, {"lessThan": "57debc907aef66319d244009d3370dcd97388d37", "status": "affected", "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "versionType": "git"}, {"lessThan": "d761be1b8f2bbabc41252deb79a426d3f0d4fa10", "status": "affected", "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "versionType": "git"}, {"lessThan": "cab9bf5f68f76cd44e0ec92bd4a60c9b83656a36", "status": "affected", "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "versionType": "git"}, {"lessThan": "c9d293d6bb0575fcb1f3408129453187e2a28a4e", "status": "affected", "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/block/null_blk/main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.14"}, {"lessThan": "4.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnull_blk: register configfs subsystem after creating default devices\n\nIn null_init(), configfs_register_subsystem() currently runs before\nregister_blkdev(), so when null_blk is built as a module, a racing mkdir()\n+ poweron from userspace can reach null_add_dev() while null_major is still\n0. __add_disk() then hits WARN_ON(disk->minors) (major=0 with minors!=0)\nand fails:\n\n[root@fedora ~]# [ 2366.521436] WARNING: block/genhd.c:476 at __add_disk+0x8a7/0xde0,\n[ 2366.523552] Modules linked in: null_blk(+) nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib\n[ 2366.529081] CPU: 26 UID: 0 PID: 1600 Comm: sh Not tainted 7.2.0-rc1+ #66 PREEMPT(full)\n......\n[ 2366.547251] Call Trace:\n[ 2366.547575] <TASK>\n[ 2366.547831] ? _raw_spin_lock+0x84/0xe0\n[ 2366.548260] add_disk_fwnode+0x114/0x560\n[ 2366.548739] null_add_dev+0x102d/0x1b80 [null_blk]\n[ 2366.549310] ? __pfx_null_add_dev+0x10/0x10 [null_blk]\n[ 2366.549906] ? mutex_lock+0xde/0x1c0\n[ 2366.550361] ? __pfx_mutex_lock+0x10/0x10\n[ 2366.550827] nullb_device_power_store+0x1e7/0x280 [null_blk]\n[ 2366.551499] ? __pfx_nullb_device_power_store+0x10/0x10 [null_blk]\n[ 2366.552177] ? __kmalloc_cache_noprof+0x1f5/0x470\n[ 2366.552748] ? configfs_write_iter+0x35c/0x4e0\n[ 2366.553242] configfs_write_iter+0x286/0x4e0\n[ 2366.553787] vfs_write+0x52d/0xd00\n[ 2366.554169] ? __pfx_vfs_write+0x10/0x10\n[ 2366.554679] ? __pfx___css_rstat_updated+0x10/0x10\n[ 2366.555196] ? fdget_pos+0x1cf/0x4c0\n[ 2366.555649] ksys_write+0xfc/0x1d0\n......\n\nAdditionally, the err_dev path destroys all devices on nullb_list while\nconfigfs is still registered. If a racing mkdir() + poweron puts a user\ndevice on the list, null_destroy_dev()->null_free_dev() kfrees the user\ndevice's nullb_device but /sys/kernel/config/nullb/<name> is still\nreachable. Any userspace access to the item will trigger a UAF.\n\nFor simplicity, move configfs_register_subsystem() to the end to solve\nthe problems above."}], "id": "CVE-2026-90189", "lastModified": "2026-10-19T09:19:08.907", "metrics": {}, "published": "2026-09-17T17:17:13.533", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2679b11e9256bd70a5ef41783bab6ad6c34a3db1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/57debc907aef66319d244009d3370dcd97388d37"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c9d293d6bb0575fcb1f3408129453187e2a28a4e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cab9bf5f68f76cd44e0ec92bd4a60c9b83656a36"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d761be1b8f2bbabc41252deb79a426d3f0d4fa10"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dbcedbe4819ae21274ea77469e61e46a878b9943"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa,2679b11e9256bd70a5ef41783bab6ad6c34a3db1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa,dbcedbe4819ae21274ea77469e61e46a878b9943)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa,57debc907aef66319d244009d3370dcd97388d37)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa,d761be1b8f2bbabc41252deb79a426d3f0d4fa10)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa,cab9bf5f68f76cd44e0ec92bd4a60c9b83656a36)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa,c9d293d6bb0575fcb1f3408129453187e2a28a4e)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.188,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.157,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,8.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-18T19:15:11.467346+00:00", "updated": "2026-09-20T02:15:17.054775+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-778"]}