null_blk: free global tag_set on init error path (CVE-2026-90188) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90188

null_blk: free global tag_set on init error path

Answer in brief

CVE-2026-90188 records a Unknown severity vulnerability in null_blk: free global tag_set on init error path. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=82f402fefa50f1675bf918bcd009981bd6b30ac8 <0b2faa330184340d9418ad2c627c2ae881772e33 \|\| >=82f402fefa50f1675bf918bcd009981bd6b30ac8 <665c94554ff0d5d88caae7f40c16c8e0a3369eda \|\| >=82f402fefa50f1675bf918bcd009981bd6b30ac8 <2882e1450fa4597811a951196e07553ea134eb31 \|\| >=82f402fefa50f1675bf918bcd009981bd6b30ac8 <2b59484ac1e64dd78dbe8c6140891c6308085a75 \|\| >=82f402fefa50f1675bf918bcd009981bd6b30ac8 <081cf37e8a0e00cd91d6df53172c9d928790a798 \|\| >=82f402fefa50f1675bf918bcd009981bd6b30ac8 <5a1c5ff3a49ba93a1fd0b70537e7a0164071760d	0b2faa330184340d9418ad2c627c2ae881772e33, 665c94554ff0d5d88caae7f40c16c8e0a3369eda, 2882e1450fa4597811a951196e07553ea134eb31, 2b59484ac1e64dd78dbe8c6140891c6308085a75, 081cf37e8a0e00cd91d6df53172c9d928790a798, 5a1c5ff3a49ba93a1fd0b70537e7a0164071760d
Linux/Linuxgeneric	4.13	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 0b2faa330184340d9418ad2c627c2ae881772e33 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: null_blk: free global tag_set on init error path If shared_tags is enabled, null_setup_tagset() allocates the global tag_set via null_init_global_tag_set(). If device creation later fails, err_dev destroys the default devices and calls unregister_blkdev(), but never frees the global tag_set. Since module init failed, null_exit() is never invoked, so the global tag_set's tags and maps are permanently leaked. Free the global tag_set in err_dev, matching null_exit() which does if (tag_set.ops) blk_mq_free_tag_set(&tag_set).

Quoted source text, attributed separately from HOL analysis.