CVE-2026-93109: RDMA/mlx5: Drain RCU callbacks during module teardown
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: 0.21% (FIRST EPSS).
- Fixed version: Linux Linux 2f946e7839f677fa14574b6babad14b37ae0bbbe, 4664368b9bd9d5d79ebad24056b98c34b9fed20f, 4be7810ba70291abb2f68cc6db0ae1b93ee9c76a.
Low priority for now. Upgrade to Linux Linux 2f946e7839f677fa14574b6babad14b37ae0bbbe, 4664368b9bd9d5d79ebad24056b98c34b9fed20f, 4be7810ba70291abb2f68cc6db0ae1b93ee9c76a 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/mlx5: Drain RCU callbacks during module teardown devx_free_subscription() can remain queued after the last DevX event file drops its module reference or an auxiliary driver detaches its devices. mlx5_ib can then unload before the callback runs. Registration error unwind has the same risk because driver registration can attach existing devices before failing. Wait after all drivers have stopped.
- Published
- Sep 17, 2026
- Updated
- Oct 19, 2026
- EPSS
- 0.2% · 11th percentile
- CWE
- —
Report tools
Action score
0
Monitor
Low priority for now.
- CVSS
- 0 / 40 · —
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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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.
We use this product, ask for helpAffected 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
- 5.6affected
- 6898d1c661d79f4707d8ba82991b2195822780ca and later · before ca428e597f12b278bf158356e34641e6386cfa82affected · git
- 6898d1c661d79f4707d8ba82991b2195822780ca and later · before 59d60e04afd012f07e996d2e34cb90a4ec6f5cffaffected · git
- 6898d1c661d79f4707d8ba82991b2195822780ca and later · before 2f946e7839f677fa14574b6babad14b37ae0bbbeaffected · git
- 6898d1c661d79f4707d8ba82991b2195822780ca and later · before 4be7810ba70291abb2f68cc6db0ae1b93ee9c76aaffected · git
- 6898d1c661d79f4707d8ba82991b2195822780ca and later · before 7babc25d8dd5b7642920fbc0737cfd1469e7025baffected · git
- 6898d1c661d79f4707d8ba82991b2195822780ca and later · before 4664368b9bd9d5d79ebad24056b98c34b9fed20faffected · git
- 6898d1c661d79f4707d8ba82991b2195822780ca and later · before e37cdd75f8d61c1123d324ae5667ac3da562290eaffected · git
- before 5.6not affected · semver
- 5.15.221 and later · up to and including 5.15.*not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.190-1 | 6.1.190-1 |
| Debian:12 | linux-6.12 | before 6.12.111-1~deb12u1 | 6.12.111-1~deb12u1 |
| Debian:13 | linux | before 6.12.111-1 | 6.12.111-1 |
| Debian:14 | linux | before 7.2.6-1 | 7.2.6-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
Published before and after this one in the same product
- ← EarlierCVE-2026-93107Sep 17, 2026 · RDMA/rxe: Avoid reprocessing the current packet after the QP enters the error state32Monitor
- ← EarlierCVE-2026-93108Sep 17, 2026 · RDMA/ipoib: Drain RCU callbacks during module teardown0Monitor
- Later →CVE-2026-93110Sep 17, 2026 · RDMA/core: Wait for RCU callbacks before unloading ib_core0Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 2f946e7839f677fa14574b6babad14b37ae0bbbe | Vendor (CNA) |
| Linux Linux | 4664368b9bd9d5d79ebad24056b98c34b9fed20f | Vendor (CNA) |
| Linux Linux | 4be7810ba70291abb2f68cc6db0ae1b93ee9c76a | Vendor (CNA) |
| Linux Linux | 59d60e04afd012f07e996d2e34cb90a4ec6f5cff | Vendor (CNA) |
| Linux Linux | 7babc25d8dd5b7642920fbc0737cfd1469e7025b | Vendor (CNA) |
| Linux Linux | ca428e597f12b278bf158356e34641e6386cfa82 | Vendor (CNA) |
| Linux Linux | e37cdd75f8d61c1123d324ae5667ac3da562290e | Vendor (CNA) |
| debian:linux | 6.1.190-1 · Debian:12 | Package registry (OSV) |
| debian:linux | 6.12.111-1 · Debian:13 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.111-1~deb12u1 · Debian:12 | Package 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.
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 researchersFinders, 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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (6 more)Show less
- git.kernel.org/stable/c/4664368b9bd9d5d79ebad24056b98c34b9fed20f
- git.kernel.org/stable/c/4be7810ba70291abb2f68cc6db0ae1b93ee9c76a
- git.kernel.org/stable/c/59d60e04afd012f07e996d2e34cb90a4ec6f5cff
- git.kernel.org/stable/c/7babc25d8dd5b7642920fbc0737cfd1469e7025b
- git.kernel.org/stable/c/ca428e597f12b278bf158356e34641e6386cfa82
- git.kernel.org/stable/c/e37cdd75f8d61c1123d324ae5667ac3da562290e
Vendor advisories and official records. Exploit/PoC links are deliberately left out.