Unknown

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

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.

Published Sep 17, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.23%

ahead of 13% of scored CVEs · Oct 18, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and < 459b59f7ed56511d6529311cb4e5e482ebfcfb8e≥ 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and < cd60992f09b7e83bfd3c76e3bb06b29f3e2fa0a8≥ 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and < c332d9e7dce234d8bef78271d003a68ee943b61b≥ 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and < f98e894ec029a752cf9c7f7834741bead0fb463d≥ 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and < 479a7f90060e62bdd9bb4036ec0a70bf460f6d23≥ 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and < 046425412529dbfca1433c8bef5641b271b4ab2a≥ 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and < ea41b5630fa3d9877ce9ed8832cf5575f742bfbb≥ 49ea0c036ede81f126f1a9389d377999fdf5c5a1 and < fe5c16bb6252dea6025b748257ddc3b2665495b0 and 7 more version 98fa991017981b52dcc4dc3924fc8e1e83e41bf4version af92e4a595e006b498c44b617ea38f697eca3469version 9c0cec79e5c914662c2cf98b4a729c0fcc8c872e≥ 4.19.130 and < 4.20≥ 5.4.49 and < 5.5≥ 5.7.6 and < 5.8version 5.8	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 18, 2026 · 3 reading(s) · max 0.23%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 17, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

10 on the record

git.kernel.org/stable/c/cd60992f09b7e83bfd3c76e3bb06b29f3e2fa0a8
NIST National Vulnerability Database
git.kernel.org/stable/c/046425412529dbfca1433c8bef5641b271b4ab2a
NIST National Vulnerability Database
git.kernel.org/stable/c/479a7f90060e62bdd9bb4036ec0a70bf460f6d23
NIST National Vulnerability Database
git.kernel.org/stable/c/ea41b5630fa3d9877ce9ed8832cf5575f742bfbb
NIST National Vulnerability Database
git.kernel.org/stable/c/fe5c16bb6252dea6025b748257ddc3b2665495b0
NIST National Vulnerability Database
git.kernel.org/stable/c/c332d9e7dce234d8bef78271d003a68ee943b61b
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-90219
GitHub Security Advisories
git.kernel.org/stable/c/f98e894ec029a752cf9c7f7834741bead0fb463d
NIST National Vulnerability Database
git.kernel.org/stable/c/459b59f7ed56511d6529311cb4e5e482ebfcfb8e
NIST National Vulnerability Database
github.com/advisories/GHSA-q35c-r5m8-jm6q
GitHub Security Advisories

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 1d
Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 1d
Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 1d
Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 1d
Unknown CVE-2026-98857 ipvs: bound LBLCR and LBLC cache growth 1d
Unknown CVE-2026-98858 io_uring: fix task_work add use-after-free with SQPOLL 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-90219 is "RDMA/cxgb4: Free debugfs on registration failure", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.23% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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