NVD / CVE Program· CNA Linux

CVE-2026-46034: vfio/cdx: Fix NULL pointer dereference in interrupt trigger path

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: 0.13% (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 338a736aaf15e8ba3635ce20b29af5b8fc15e66a, 51bf7638f33aece41cb3f4cbeb942cc52950e329, 5d6c349c9823eb819fed8b537b088cf38126018c.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 338a736aaf15e8ba3635ce20b29af5b8fc15e66a, 51bf7638f33aece41cb3f4cbeb942cc52950e329, 5d6c349c9823eb819fed8b537b088cf38126018c 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: vfio/cdx: Fix NULL pointer dereference in interrupt trigger path Add validation to ensure MSI is configured before accessing cdx_irqs array in vfio_cdx_set_msi_trigger(). Without this check, userspace can trigger a NULL pointer dereference by calling VFIO_DEVICE_SET_IRQS with VFIO_IRQ_SET_DATA_BOOL or VFIO_IRQ_SET_DATA_NONE flags before ever setting up interrupts via VFIO_IRQ_SET_DATA_EVENTFD. The vfio_cdx_msi_enable() function allocates the cdx_irqs array and sets config_msi to 1 only when called through the EVENTFD path. The trigger loop (for DATA_BOOL/DATA_NONE) assumed this had already been done, but there was no enforcement of this call ordering. This matches the protection used in the PCI VFIO driver where vfio_pci_set_msi_trigger() checks irq_is() before the trigger loop.

MediumCVSS 5.5 · v3.1—No exploit Fix available

Published: May 27, 2026
Updated: Jun 17, 2026
EPSS: 0.1% · 2th percentile
CWE: CWE-476

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.

ProductVersion

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 kernel6.10 and later · before 6.12.86
linux linux kernel6.13 and later · before 6.18.27
linux linux kernel6.19 and later · before 7.0.4

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
- 6.10affected
- 848e447e000c41894ff931dc7c004fd42c8840f8 and later · before 51bf7638f33aece41cb3f4cbeb942cc52950e329affected · git
- 848e447e000c41894ff931dc7c004fd42c8840f8 and later · before 5d6c349c9823eb819fed8b537b088cf38126018caffected · git
- 848e447e000c41894ff931dc7c004fd42c8840f8 and later · before 338a736aaf15e8ba3635ce20b29af5b8fc15e66aaffected · git
- 848e447e000c41894ff931dc7c004fd42c8840f8 and later · before 5ea5880764cbb164afb17a62e76ca75dc371409daffected · git
- before 6.10not affected · semver
- 6.12.86 and later · up to and including 6.12.*not affected · semver
- 6.18.27 and later · up to and including 6.18.*not affected · semver
- 7.0.4 and later · up to and including 7.0.*not affected · semver
- 7.1 and laternot affected · original_commit_for_fix

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:13	linux	before 6.12.86-1	6.12.86-1
Debian:14	linux	before 7.0.4-1	7.0.4-1
SUSE:Linux Enterprise Live Patching 15 SP7	kernel-livepatch-SLE15-SP7_Update_23	before 1-150700.15.3.2	1-150700.15.3.2
SUSE:Linux Enterprise Live Patching 15 SP7	kernel-livepatch-SLE15-SP7-RT_Update_22	before 1-150700.1.3.1	1-150700.1.3.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7	kernel-64kb	before 6.4.0-150700.53.87.3	6.4.0-150700.53.87.3
SUSE:Linux Enterprise Module for Basesystem 15 SP7	kernel-default	before 6.4.0-150700.53.87.3	6.4.0-150700.53.87.3
SUSE:Linux Enterprise Module for Basesystem 15 SP7	kernel-default-base	before 6.4.0-150700.53.87.3.150700.17.49.2	6.4.0-150700.53.87.3.150700.17.49.2
SUSE:Linux Enterprise Module for Basesystem 15 SP7	kernel-source	before 6.4.0-150700.53.87.3	6.4.0-150700.53.87.3
SUSE:Linux Enterprise Module for Basesystem 15 SP7	kernel-zfcpdump	before 6.4.0-150700.53.87.3	6.4.0-150700.53.87.3
SUSE:Linux Enterprise Module for Development Tools 15 SP7	kernel-docs	before 6.4.0-150700.53.87.3	6.4.0-150700.53.87.3
SUSE:Linux Enterprise Module for Development Tools 15 SP7	kernel-obs-build	before 6.4.0-150700.53.87.2	6.4.0-150700.53.87.2
SUSE:Linux Enterprise Module for Development Tools 15 SP7	kernel-syms	before 6.4.0-150700.53.87.1	6.4.0-150700.53.87.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP7	kernel-azure	before 6.4.0-150700.53.87.3	6.4.0-150700.53.87.3
SUSE:Real Time Module 15 SP7	kernel-rt	before 6.4.0-150700.7.81.1	6.4.0-150700.7.81.1
SUSE:Real Time Module 15 SP7	kernel-source-rt	before 6.4.0-150700.7.81.1	6.4.0-150700.7.81.1
SUSE:Real Time Module 15 SP7	kernel-syms-rt	before 6.4.0-150700.7.81.1	6.4.0-150700.7.81.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
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

Published before and after this one in the same product

← EarlierCVE-2026-46030May 27, 2026 · EDAC/versalnet: Fix device_node leak in mc_probe()
22Monitor
← EarlierCVE-2026-46031May 27, 2026 · net: ks8851: Reinstate disabling of BHs around IRQ handler
30Monitor
Later →CVE-2026-46035May 27, 2026 · mm/page_alloc: return NULL early from alloc_frozen_pages_nolock() in NMI on UP
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	338a736aaf15e8ba3635ce20b29af5b8fc15e66a	Vendor (CNA)
Linux Linux	51bf7638f33aece41cb3f4cbeb942cc52950e329	Vendor (CNA)
Linux Linux	5d6c349c9823eb819fed8b537b088cf38126018c	Vendor (CNA)
Linux Linux	5ea5880764cbb164afb17a62e76ca75dc371409d	Vendor (CNA)
debian:linux	6.12.86-1 · Debian:13	Package registry (OSV)
suse:kernel-64kb	6.4.0-150700.53.87.3 · SUSE:Linux Enterprise Module for Basesystem 15 SP7	Package registry (OSV)
suse:kernel-azure	6.4.0-150700.53.87.3 · SUSE:Linux Enterprise Module for Public Cloud 15 SP7	Package registry (OSV)
suse:kernel-default	6.4.0-150700.53.87.3 · SUSE:Linux Enterprise Module for Basesystem 15 SP7	Package registry (OSV)
suse:kernel-default-base	6.4.0-150700.53.87.3.150700.17.49.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP7	Package registry (OSV)
suse:kernel-docs	6.4.0-150700.53.87.3 · SUSE:Linux Enterprise Module for Development Tools 15 SP7	Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7_Update_23	1-150700.15.3.2 · SUSE:Linux Enterprise Live Patching 15 SP7	Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7-RT_Update_22	1-150700.1.3.1 · SUSE:Linux Enterprise Live Patching 15 SP7	Package registry (OSV)
suse:kernel-obs-build	6.4.0-150700.53.87.2 · SUSE:Linux Enterprise Module for Development Tools 15 SP7	Package registry (OSV)
suse:kernel-rt	6.4.0-150700.7.81.1 · SUSE:Real Time Module 15 SP7	Package registry (OSV)
suse:kernel-source	6.4.0-150700.53.87.3 · SUSE:Linux Enterprise Module for Basesystem 15 SP7	Package registry (OSV)
suse:kernel-syms	6.4.0-150700.53.87.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7	Package registry (OSV)
suse:kernel-zfcpdump	6.4.0-150700.53.87.3 · SUSE:Linux Enterprise Module for Basesystem 15 SP7	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.

No history yet (it accumulates with the daily EPSS job).

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-26-0290 · Jun 2, 2026(Linux Kernel Güvenlik Bildirimi)

All national notices →

Technical details

Attack conditions

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.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

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✗ → ✓Sep 28, 2026, 10:09 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/338a736aaf15e8ba3635ce20b29af5b8fc15e66a

Show all references (3 more)

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

All records