NVD / CVE Program· CNA Linux

CVE-2026-64475: vfio/pci: Release the VGA arbiter client on register_device() failure

Noroxi assessment

Priority: Monitor (action score 35/100)

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 0f2a35a0c7ea7da347b814750eaa78adf3582381, 278a5659c391fe5afe5f9ce1bad1fd24e90144f1, 42d758a09d2c46c42357ecde9a5492f015bde2e5; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1.

Low priority for now. Upgrade to Linux Linux 0f2a35a0c7ea7da347b814750eaa78adf3582381, 278a5659c391fe5afe5f9ce1bad1fd24e90144f1, 42d758a09d2c46c42357ecde9a5492f015bde2e5; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1 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/pci: Release the VGA arbiter client on register_device() failure The re-order in the Fixes commit below displaced vfio_pci_vga_init() as the last failure point of what is now vfio_pci_core_register_device() without introducing an unwind for the VGA arbiter registration. In current kernels this is mostly benign because vfio_pci_set_decode() only uses pci_dev state, but the original failure path could leave a callback with a freed vdev cookie. The stale registration also becomes unsafe again once the callback follows drvdata to the vfio device. Add the required VGA unwind callout.

HighCVSS 8.8 · v3.1—No exploit Fix available

Memory safety

Published: Jul 25, 2026
Updated: Oct 19, 2026
EPSS: 0.1% · 3th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 35 / 40 · 8.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 8.8; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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

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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
- d62dccb417cf972c978bf3c68a7d5e846bcf953e, 6694b8daffac5a8661071f085608afc78f7acd08, 5.13affected
- 87856f9af04eaacf9848710625a4ffee1d020fa9 and later · before 0f2a35a0c7ea7da347b814750eaa78adf3582381affected · git
- 4aeec3984ddc853f7c65903bde472ffdef738bae and later · before 8d65decde9afd2bd78bcfffdc0df73b82a0b5509affected · git
- 4aeec3984ddc853f7c65903bde472ffdef738bae and later · before ef4c38d30b3744e89eb5048218904bb629ea8d47affected · git
- 4aeec3984ddc853f7c65903bde472ffdef738bae and later · before 9e0a3f642e607848669235f5069f35640abbfc88affected · git
- 4aeec3984ddc853f7c65903bde472ffdef738bae and later · before 42d758a09d2c46c42357ecde9a5492f015bde2e5affected · git
- 4aeec3984ddc853f7c65903bde472ffdef738bae and later · before 52adb2dff7ce3d8430e2bdc5988b618a430def85affected · git
- 4aeec3984ddc853f7c65903bde472ffdef738bae and later · before 278a5659c391fe5afe5f9ce1bad1fd24e90144f1affected · git
- 4aeec3984ddc853f7c65903bde472ffdef738bae and later · before daedde7f024ecf88bc8e832ed40cf2c795f0796aaffected · git
- 5.10.37 and later · before 5.10.261affected · 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 6.1.180-1	6.1.180-1
Debian:12	linux-6.12	before 6.12.100-1~deb12u1	6.12.100-1~deb12u1
Debian:13	linux	before 6.12.96-1	6.12.96-1
Debian:14	linux	before 7.1.4-1	7.1.4-1

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
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CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
40Plan

Published before and after this one in the same product

← EarlierCVE-2026-64460Jul 25, 2026 · PCI/IOV: Skip VF Resizable BAR restore on read error
28Monitor
← EarlierCVE-2026-64463Jul 25, 2026 · usb: typec: tcpci_rt1711h: unregister TCPCI port with devres
31Monitor
Later →CVE-2026-64481Jul 25, 2026 · ALSA: hda/cs35l41: Fix firmware load work teardown
31Monitor

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	0f2a35a0c7ea7da347b814750eaa78adf3582381	Vendor (CNA)
Linux Linux	278a5659c391fe5afe5f9ce1bad1fd24e90144f1	Vendor (CNA)
Linux Linux	42d758a09d2c46c42357ecde9a5492f015bde2e5	Vendor (CNA)
Linux Linux	5.10.261	Vendor (CNA)
Linux Linux	5.12	Vendor (CNA)
Linux Linux	5.13	Vendor (CNA)
Linux Linux	52adb2dff7ce3d8430e2bdc5988b618a430def85	Vendor (CNA)
Linux Linux	8d65decde9afd2bd78bcfffdc0df73b82a0b5509	Vendor (CNA)
Linux Linux	9e0a3f642e607848669235f5069f35640abbfc88	Vendor (CNA)
Linux Linux	daedde7f024ecf88bc8e832ed40cf2c795f0796a	Vendor (CNA)
Linux Linux	ef4c38d30b3744e89eb5048218904bb629ea8d47	Vendor (CNA)
azl3 kernel 6.6.144.1-1 on Azure Linux 3.0	6.6.145.2-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.180-1 · Debian:12	Package registry (OSV)
debian:linux-6.12	6.12.100-1~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.

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.

CVE-2026-645230 days apartnet/handshake: Take a long-lived file reference at submit
39Monitor
CVE-2026-645301 days apartnet/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle
39Monitor
CVE-2026-645412 days apartnet/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket
39Monitor
CVE-2026-639226 days apartipv6: exthdrs: refresh nh after handling HAO option
39Monitor
CVE-2026-639796 days apartnet/handshake: hand off the pinned file reference to accept_doit
39Monitor
CVE-2026-6456410 days apartsctp: don't free the ASCONF's own transport in DEL-IP processing
39Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

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: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

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

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

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

SSVC exploitation— → noneOct 16, 2026, 5:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

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

References

git.kernel.org/stable/c/0f2a35a0c7ea7da347b814750eaa78adf3582381

Show all references (7 more)

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

All records