CVE-2026-43468· NVD / CVE Program· CNA Linux

net/mlx5: Fix deadlock between devlink lock and esw->wq

Noroxi assessment

Priority: Monitor (action score 22/100)

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: 0.12% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 0de867f6e34eae6907b367fd152c55e61cb98608, 3c7313cb41b1b427078440364d2f042c276a1c0b, 4a7838bebc38374f74baaf88bf2cf8d439a92923.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0de867f6e34eae6907b367fd152c55e61cb98608, 3c7313cb41b1b427078440364d2f042c276a1c0b, 4a7838bebc38374f74baaf88bf2cf8d439a92923 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/mlx5: Fix deadlock between devlink lock and esw->wq esw->work_queue executes esw_functions_changed_event_handler -> esw_vfs_changed_event_handler and acquires the devlink lock. .eswitch_mode_set (acquires devlink lock in devlink_nl_pre_doit) -> mlx5_devlink_eswitch_mode_set -> mlx5_eswitch_disable_locked -> mlx5_eswitch_event_handler_unregister -> flush_workqueue deadlocks when esw_vfs_changed_event_handler executes. Fix that by no longer flushing the work to avoid the deadlock, and using a generation counter to keep track of work relevance. This avoids an old handler manipulating an esw that has undergone one or more mode changes: - the counter is incremented in mlx5_eswitch_event_handler_unregister. - the counter is read and passed to the ephemeral mlx5_host_work struct. - the work handler takes the devlink lock and bails out if the current generation is different than the one it was scheduled to operate on. - mlx5_eswitch_cleanup does the final draining before destroying the wq. No longer flushing the workqueue has the side effect of maybe no longer cancelling pending vport_change_handler work items, but that's ok since those are disabled elsewhere: - mlx5_eswitch_disable_locked disables the vport eq notifier. - mlx5_esw_vport_disable disarms the HW EQ notification and marks vport->enabled under state_lock to false to prevent pending vport handler from doing anything. - mlx5_eswitch_cleanup destroys the workqueue and makes sure all events are disabled/finished.

MediumCVSS 5.5 · v3.1—No exploit Fix available

Denial of service

BDU:2026-12858

Published: May 8, 2026
Updated: Jun 17, 2026
EPSS: 0.1% · 2th percentile
CWE: CWE-667

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

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.

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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 help

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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel6.0 and later · before 6.1.167
linux linux kernel6.2 and later · before 6.6.130
linux linux kernel6.7 and later · before 6.12.78
linux linux kernel6.13 and later · before 6.18.19
linux linux kernel6.19 and later · before 6.19.9
linux linux kernel7.0

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
- 6.0affected
- f1bc646c9a06f09aad5d8bacb87103b5573ee45e and later · before 0de867f6e34eae6907b367fd152c55e61cb98608affected · git
- f1bc646c9a06f09aad5d8bacb87103b5573ee45e and later · before 957d2a58f7f8ebcbdd0a85935e0d2675134b890daffected · git
- f1bc646c9a06f09aad5d8bacb87103b5573ee45e and later · before 3c7313cb41b1b427078440364d2f042c276a1c0baffected · git
- f1bc646c9a06f09aad5d8bacb87103b5573ee45e and later · before 4a7838bebc38374f74baaf88bf2cf8d439a92923affected · git
- f1bc646c9a06f09aad5d8bacb87103b5573ee45e and later · before 90e7e5d14d0bd25ffd019a3aa39d9f1c05fedbe1affected · git
- f1bc646c9a06f09aad5d8bacb87103b5573ee45e and later · before aed763abf0e905b4b8d747d1ba9e172961572f57affected · git
- before 6.0not affected · semver
- 6.1.167 and later · up to and including 6.1.*not affected · semver
- 6.6.130 and later · up to and including 6.6.*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 6.1.170-1	6.1.170-1
Debian:13	linux	before 6.12.85-1	6.12.85-1
Debian:14	linux	before 6.19.10-1	6.19.10-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now
CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
83Now

Published before and after this one in the same product

← EarlierCVE-2026-43462May 8, 2026 · net: spacemit: Fix error handling in emac_tx_mem_map()
30Monitor
← EarlierCVE-2026-43467May 8, 2026 · net/mlx5: Fix crash when moving to switchdev mode
22Monitor
Later →CVE-2026-43470May 8, 2026 · nfs: return EISDIR on nfs3_proc_create if d_alias is a dir
22Monitor

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	0de867f6e34eae6907b367fd152c55e61cb98608	Vendor (CNA)
Linux Linux	3c7313cb41b1b427078440364d2f042c276a1c0b	Vendor (CNA)
Linux Linux	4a7838bebc38374f74baaf88bf2cf8d439a92923	Vendor (CNA)
Linux Linux	90e7e5d14d0bd25ffd019a3aa39d9f1c05fedbe1	Vendor (CNA)
Linux Linux	957d2a58f7f8ebcbdd0a85935e0d2675134b890d	Vendor (CNA)
Linux Linux	aed763abf0e905b4b8d747d1ba9e172961572f57	Vendor (CNA)
debian:linux	6.1.170-1 · 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.

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).