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NVD / CVE Program· CNA Linux

CVE-2026-90219: RDMA/cxgb4: Free debugfs on registration failure

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: 0.22% (FIRST EPSS).
  • Fixed version: Linux Linux 046425412529dbfca1433c8bef5641b271b4ab2a, 4.20, 459b59f7ed56511d6529311cb4e5e482ebfcfb8e.

Low priority for now. Upgrade to Linux Linux 046425412529dbfca1433c8bef5641b271b4ab2a, 4.20, 459b59f7ed56511d6529311cb4e5e482ebfcfb8e 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: RDMA/cxgb4: Free debugfs on registration failure c4iw_alloc() creates the per-device debugfs tree (dev->debugfs_root via setup_debugfs()), but it is removed only in c4iw_remove(), not in c4iw_dealloc(). When RDMA device registration fails, the registration worker's err_dealloc_ctx path calls c4iw_dealloc() directly, bypassing c4iw_remove(), so the debugfs dentries leak and outlive the freed c4iw_dev. Move debugfs_remove_recursive() into c4iw_dealloc() so every path that frees ctx->dev also removes its debugfs tree.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 13th 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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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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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

    • 98fa991017981b52dcc4dc3924fc8e1e83e41bf4, af92e4a595e006b498c44b617ea38f697eca3469, 9c0cec79e5c914662c2cf98b4a729c0fcc8c872e, 5.8affected
    • 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and later · before 459b59f7ed56511d6529311cb4e5e482ebfcfb8eaffected · git
    • 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and later · before cd60992f09b7e83bfd3c76e3bb06b29f3e2fa0a8affected · git
    • 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and later · before c332d9e7dce234d8bef78271d003a68ee943b61baffected · git
    • 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and later · before f98e894ec029a752cf9c7f7834741bead0fb463daffected · git
    • 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and later · before 479a7f90060e62bdd9bb4036ec0a70bf460f6d23affected · git
    • 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and later · before 046425412529dbfca1433c8bef5641b271b4ab2aaffected · git
    • 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and later · before ea41b5630fa3d9877ce9ed8832cf5575f742bfbbaffected · git
    • 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and later · before fe5c16bb6252dea6025b748257ddc3b2665495b0affected · git
    • 4.19.130 and later · before 4.20affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
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-2026-90217Sep 17, 2026 · bpf: Compare iterator types during state pruning
    31Monitor
  • ← EarlierCVE-2026-90218Sep 17, 2026 · RDMA/cma: Fix WARNING in res_to_rt
    0Monitor
  • Later →CVE-2026-90220Sep 17, 2026 · ALSA: seq: Don't leak the extension cell pointer in the bounce payload
    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 Linux046425412529dbfca1433c8bef5641b271b4ab2aVendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux459b59f7ed56511d6529311cb4e5e482ebfcfb8eVendor (CNA)
Linux Linux479a7f90060e62bdd9bb4036ec0a70bf460f6d23Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux5.8Vendor (CNA)
Linux Linuxc332d9e7dce234d8bef78271d003a68ee943b61bVendor (CNA)
Linux Linuxcd60992f09b7e83bfd3c76e3bb06b29f3e2fa0a8Vendor (CNA)
Linux Linuxea41b5630fa3d9877ce9ed8832cf5575f742bfbbVendor (CNA)
Linux Linuxf98e894ec029a752cf9c7f7834741bead0fb463dVendor (CNA)
Linux Linuxfe5c16bb6252dea6025b748257ddc3b2665495b0Vendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
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 (7 more)

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

All records