null_blk: register configfs subsystem after creating default devices
In the Linux kernel, the following vulnerability has been resolved: null_blk: register configfs subsystem after creating default devices In null_init(), configfs_register_subsystem() currently runs before register_blkdev(), so when null_blk is built as a module, a racing mkdir() + poweron from userspace can reach null_add_dev() while null_major is still 0. __add_disk() then hits WARN_ON(disk->minors) (major=0 with minors!=0) and fails: [root@fedora ~]# [ 2366.521436] WARNING: block/genhd.c:476 at __add_disk+0x8a7/0xde0, [ 2366.523552] Modules linked in: null_blk(+) nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib [ 2366.529081] CPU: 26 UID: 0 PID: 1600 Comm: sh Not tainted 7.2.0-rc1+ #66 PREEMPT(full) ...... [ 2366.547251] Call Trace: [ 2366.547575] [ 2366.547831] ? _raw_spin_lock+0x84/0xe0 [ 2366.548260] add_disk_fwnode+0x114/0x560 [ 2366.548739] null_add_dev+0x102d/0x1b80 [null_blk] [ 2366.549310] ? __pfx_null_add_dev+0x10/0x10 [null_blk] [ 2366.549906] ? mutex_lock+0xde/0x1c0 [ 2366.550361] ? __pfx_mutex_lock+0x10/0x10 [ 2366.550827] nullb_device_power_store+0x1e7/0x280 [null_blk] [ 2366.551499] ? __pfx_nullb_device_power_store+0x10/0x10 [null_blk] [ 2366.552177] ? __kmalloc_cache_noprof+0x1f5/0x470 [ 2366.552748] ? configfs_write_iter+0x35c/0x4e0 [ 2366.553242] configfs_write_iter+0x286/0x4e0 [ 2366.553787] vfs_write+0x52d/0xd00 [ 2366.554169] ? __pfx_vfs_write+0x10/0x10 [ 2366.554679] ? __pfx___css_rstat_updated+0x10/0x10 [ 2366.555196] ? fdget_pos+0x1cf/0x4c0 [ 2366.55564
CVE-2026-90189
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-90189
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa",
"lessThan": "2679b11e9256bd70a5ef41783bab6ad6c34a3db1",
"versionType": "git"
},
{
"status": "affected",
"version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa",
"lessThan": "dbcedbe4819ae21274ea77469e61e46a878b9943",
"versionType": "git"
},
{
"status": "affected",
"version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa",
"lessThan": "57debc907aef66319d244009d3370dcd97388d37",
"versionType": "git"
},
{
"status": "affected",
"version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa",
"lessThan": "d761be1b8f2bbabc41252deb79a426d3f0d4fa10",
"versionType": "git"
},
{
"status": "affected",
"version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa",
"lessThan": "cab9bf5f68f76cd44e0ec92bd4a60c9b83656a36",
"versionType": "git"
},
{
"status": "affected",
"version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa",
"lessThan": "c9d293d6bb0575fcb1f3408129453187e2a28a4e",
"versionType": "git"
}
],
"programFiles": [
"drivers/block/null_blk/main.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/block/null_blk/main.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90189
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36567 · Revision 1
- Added to Heist Feed
- Publisher date