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NVD / CVE Program· CNA Linux

CVE-2026-43094: ixgbevf: add missing negotiate_features op to Hyper-V ops table

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 1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb, 2270ebab53128fb73c4a70a292be09094074737f, 376d74ea03589914fbe2dedcbebf418396c04fd0.

Low priority for now. Upgrade to Linux Linux 1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb, 2270ebab53128fb73c4a70a292be09094074737f, 376d74ea03589914fbe2dedcbebf418396c04fd0 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: ixgbevf: add missing negotiate_features op to Hyper-V ops table Commit a7075f501bd3 ("ixgbevf: fix mailbox API compatibility by negotiating supported features") added the .negotiate_features callback to ixgbe_mac_operations and populated it in ixgbevf_mac_ops, but forgot to add it to ixgbevf_hv_mac_ops. This leaves the function pointer NULL on Hyper-V VMs. During probe, ixgbevf_negotiate_api() calls ixgbevf_set_features(), which unconditionally dereferences hw->mac.ops.negotiate_features(). On Hyper-V this results in a NULL pointer dereference: BUG: kernel NULL pointer dereference, address: 0000000000000000 [...] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine [...] Workqueue: events work_for_cpu_fn RIP: 0010:0x0 [...] Call Trace: ixgbevf_negotiate_api+0x66/0x160 [ixgbevf] ixgbevf_sw_init+0xe4/0x1f0 [ixgbevf] ixgbevf_probe+0x20f/0x4a0 [ixgbevf] local_pci_probe+0x50/0xa0 work_for_cpu_fn+0x1a/0x30 [...] Add ixgbevf_hv_negotiate_features_vf() that returns -EOPNOTSUPP and wire it into ixgbevf_hv_mac_ops. The caller already handles -EOPNOTSUPP gracefully.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 6, 2026
Updated
Nov 6, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

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

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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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When you'll hear from us

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  • when exploit code appears or is weaponized
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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.

VendorProduct
linuxlinux kernel

Affected versions

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

  • linux linux kernel6.1.158 and later · before 6.2
  • linux linux kernel6.6.114 and later · before 6.6.136
  • linux linux kernel6.12.55 and later · before 6.12.83
  • linux linux kernel6.17.5 and later · before 6.18
  • linux linux kernel6.18.1 and later · before 6.18.24
  • linux linux kernel6.19 and later · before 6.19.14
  • linux linux kernel6.18
  • 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

    • a376e29b1b196dc90b50df7e5e3947e3026300c4, 6.18affected
    • 871ac1cd4ce4804defcb428cbb003fd84c415ff4 and later · before 376d74ea03589914fbe2dedcbebf418396c04fd0affected · git
    • 2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18 and later · before d8a747057a17ffc79e31df1abb11d05e1669d8e5affected · git
    • bf580112ed61736c2645a893413a04732505d4b1 and later · before 2270ebab53128fb73c4a70a292be09094074737faffected · git
    • a7075f501bd33c93570af759b6f4302ef0175168 and later · before 4db7b61ec1d1b2b67c0881b62fc4f9583bc21484affected · git
    • a7075f501bd33c93570af759b6f4302ef0175168 and later · before 1455ff8809843e6e83f1f5b5c0bcc2224c99a3cbaffected · git
    • a7075f501bd33c93570af759b6f4302ef0175168 and later · before 4821d563cd7f251ae728be1a6d04af82a294a5b9affected · git
    • 6.1.158 and later · before 6.1.175affected · semver
    • 6.6.114 and later · before 6.6.136affected · semver
    • 6.12.55 and later · before 6.12.83affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.14-16.19.14-1

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-2026-43091May 6, 2026 · xfrm: Wait for RCU readers during policy netns exit
    31Monitor
  • ← EarlierCVE-2026-43093May 6, 2026 · xsk: tighten UMEM headroom validation to account for tailroom and min frame
    31Monitor
  • Later →CVE-2026-43095May 6, 2026 · ASoC: SDCA: Fix errors in IRQ cleanup
    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 / packageFixed versionSource
Linux Linux1455ff8809843e6e83f1f5b5c0bcc2224c99a3cbVendor (CNA)
Linux Linux2270ebab53128fb73c4a70a292be09094074737fVendor (CNA)
Linux Linux376d74ea03589914fbe2dedcbebf418396c04fd0Vendor (CNA)
Linux Linux4821d563cd7f251ae728be1a6d04af82a294a5b9Vendor (CNA)
Linux Linux4db7b61ec1d1b2b67c0881b62fc4f9583bc21484Vendor (CNA)
Linux Linux6.1.175Vendor (CNA)
Linux Linux6.12.83Vendor (CNA)
Linux Linux6.18Vendor (CNA)
Linux Linux6.6.136Vendor (CNA)
Linux Linuxd8a747057a17ffc79e31df1abb11d05e1669d8e5Vendor (CNA)
debian:linux6.1.176-1 · Debian:12Package 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).

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

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (6 more)

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

All records