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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 0b1c2af8a22c35cb099c735c2f63ea3ba757557d, 2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c, 45be87c5195f34c0a51598bc91186f600be5c4c9.

Low priority for now. Upgrade to Linux Linux 0b1c2af8a22c35cb099c735c2f63ea3ba757557d, 2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c, 45be87c5195f34c0a51598bc91186f600be5c4c9 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 21, 2026
EPSS
0.2% · 9th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.17affected
    • 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d and later · before 45be87c5195f34c0a51598bc91186f600be5c4c9affected · git
    • 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d and later · before 2775bf36be7872834a7f8c0a0d9681a1a3e1cd4caffected · git
    • 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d and later · before 5fe03b5257095e2beef0bc79e1f068fbd09a24c7affected · git
    • 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d and later · before 63ab05e8f9654aa100d366c0236399fda6ffaab1affected · git
    • 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d and later · before 0b1c2af8a22c35cb099c735c2f63ea3ba757557daffected · git
    • before 5.17not affected · semver
    • 6.6.160 and later · up to and including 6.6.*not affected · semver
    • 6.12.110 and later · up to and including 6.12.*not affected · semver
    • 6.18.52 and later · up to and including 6.18.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-90133Sep 17, 2026 · ntfs: Fix index_root heap OOB write in ntfs_ir_to_ib()
    31Monitor
  • ← EarlierCVE-2026-90134Sep 17, 2026 · ntfs: fix kmap_local_page() usage in compress
    0Monitor
  • Later →CVE-2026-90136Sep 17, 2026 · platform/x86/amd/hsmp: Reject negative power cap writes in hwmon
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0b1c2af8a22c35cb099c735c2f63ea3ba757557dVendor (CNA)
Linux Linux2775bf36be7872834a7f8c0a0d9681a1a3e1cd4cVendor (CNA)
Linux Linux45be87c5195f34c0a51598bc91186f600be5c4c9Vendor (CNA)
Linux Linux5fe03b5257095e2beef0bc79e1f068fbd09a24c7Vendor (CNA)
Linux Linux63ab05e8f9654aa100d366c0236399fda6ffaab1Vendor (CNA)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records