net: add missing ref_tracker_dir_exit() to alloc_netdev_mqs() (CVE-2026-90135) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90135

net: add missing ref_tracker_dir_exit() to alloc_netdev_mqs()

Answer in brief

CVE-2026-90135 records a Unknown severity vulnerability in net: add missing ref_tracker_dir_exit() to alloc_netdev_mqs(). 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	>=4d92b95ff2f95f13df9bad0b5a25a9f60e72758d <2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c \|\| >=4d92b95ff2f95f13df9bad0b5a25a9f60e72758d <5fe03b5257095e2beef0bc79e1f068fbd09a24c7 \|\| >=4d92b95ff2f95f13df9bad0b5a25a9f60e72758d <63ab05e8f9654aa100d366c0236399fda6ffaab1 \|\| >=4d92b95ff2f95f13df9bad0b5a25a9f60e72758d <0b1c2af8a22c35cb099c735c2f63ea3ba757557d	2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c, 5fe03b5257095e2beef0bc79e1f068fbd09a24c7, 63ab05e8f9654aa100d366c0236399fda6ffaab1, 0b1c2af8a22c35cb099c735c2f63ea3ba757557d
Linux/Linuxgeneric	5.17	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c 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: net: add missing ref_tracker_dir_exit() to alloc_netdev_mqs() sashiko is reporting that trying to read /sys/kernel/debug/ref_tracker/* causes use-afer-free crash when either alloc_percpu() or dev_addr_init() in alloc_netdev_mqs() failed, for commit 4d92b95ff2f9 ("net: add net device refcount tracker infrastructure") added ref_tracker_dir_exit() to only free_netdev() path.

Quoted source text, attributed separately from HOL analysis.