CVE-2026-43094 (GCVE-0-2026-43094)
Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-06 07:40
VLAI?
Title
ixgbevf: add missing negotiate_features op to Hyper-V ops table
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18 , < d8a747057a17ffc79e31df1abb11d05e1669d8e5
(git)
Affected: bf580112ed61736c2645a893413a04732505d4b1 , < 2270ebab53128fb73c4a70a292be09094074737f (git) Affected: a7075f501bd33c93570af759b6f4302ef0175168 , < 4db7b61ec1d1b2b67c0881b62fc4f9583bc21484 (git) Affected: a7075f501bd33c93570af759b6f4302ef0175168 , < 1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb (git) Affected: a7075f501bd33c93570af759b6f4302ef0175168 , < 4821d563cd7f251ae728be1a6d04af82a294a5b9 (git) Affected: 871ac1cd4ce4804defcb428cbb003fd84c415ff4 (git) Affected: a376e29b1b196dc90b50df7e5e3947e3026300c4 (git) |
||
{
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"programFiles": [
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"vendor": "Linux",
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"version": "0",
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{
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"status": "unaffected",
"version": "6.6.136",
"versionType": "semver"
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{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.83",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.18.24",
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},
{
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"status": "unaffected",
"version": "6.19.14",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nixgbevf: add missing negotiate_features op to Hyper-V ops table\n\nCommit a7075f501bd3 (\"ixgbevf: fix mailbox API compatibility by\nnegotiating supported features\") added the .negotiate_features callback\nto ixgbe_mac_operations and populated it in ixgbevf_mac_ops, but forgot\nto add it to ixgbevf_hv_mac_ops. This leaves the function pointer NULL\non Hyper-V VMs.\n\nDuring probe, ixgbevf_negotiate_api() calls ixgbevf_set_features(),\nwhich unconditionally dereferences hw-\u003emac.ops.negotiate_features().\nOn Hyper-V this results in a NULL pointer dereference:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n [...]\n Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine [...]\n Workqueue: events work_for_cpu_fn\n RIP: 0010:0x0\n [...]\n Call Trace:\n ixgbevf_negotiate_api+0x66/0x160 [ixgbevf]\n ixgbevf_sw_init+0xe4/0x1f0 [ixgbevf]\n ixgbevf_probe+0x20f/0x4a0 [ixgbevf]\n local_pci_probe+0x50/0xa0\n work_for_cpu_fn+0x1a/0x30\n [...]\n\nAdd ixgbevf_hv_negotiate_features_vf() that returns -EOPNOTSUPP and\nwire it into ixgbevf_hv_mac_ops. The caller already handles -EOPNOTSUPP\ngracefully."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-06T07:40:25.930Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/d8a747057a17ffc79e31df1abb11d05e1669d8e5"
},
{
"url": "https://git.kernel.org/stable/c/2270ebab53128fb73c4a70a292be09094074737f"
},
{
"url": "https://git.kernel.org/stable/c/4db7b61ec1d1b2b67c0881b62fc4f9583bc21484"
},
{
"url": "https://git.kernel.org/stable/c/1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb"
},
{
"url": "https://git.kernel.org/stable/c/4821d563cd7f251ae728be1a6d04af82a294a5b9"
}
],
"title": "ixgbevf: add missing negotiate_features op to Hyper-V ops table",
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}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-43094",
"datePublished": "2026-05-06T07:40:25.930Z",
"dateReserved": "2026-05-01T14:12:55.984Z",
"dateUpdated": "2026-05-06T07:40:25.930Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-43094",
"date": "2026-05-09",
"epss": "0.00018",
"percentile": "0.04917"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-43094\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-06T10:16:22.790\",\"lastModified\":\"2026-05-06T13:08:07.970\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nixgbevf: add missing negotiate_features op to Hyper-V ops table\\n\\nCommit a7075f501bd3 (\\\"ixgbevf: fix mailbox API compatibility by\\nnegotiating supported features\\\") added the .negotiate_features callback\\nto ixgbe_mac_operations and populated it in ixgbevf_mac_ops, but forgot\\nto add it to ixgbevf_hv_mac_ops. This leaves the function pointer NULL\\non Hyper-V VMs.\\n\\nDuring probe, ixgbevf_negotiate_api() calls ixgbevf_set_features(),\\nwhich unconditionally dereferences hw-\u003emac.ops.negotiate_features().\\nOn Hyper-V this results in a NULL pointer dereference:\\n\\n BUG: kernel NULL pointer dereference, address: 0000000000000000\\n [...]\\n Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine [...]\\n Workqueue: events work_for_cpu_fn\\n RIP: 0010:0x0\\n [...]\\n Call Trace:\\n ixgbevf_negotiate_api+0x66/0x160 [ixgbevf]\\n ixgbevf_sw_init+0xe4/0x1f0 [ixgbevf]\\n ixgbevf_probe+0x20f/0x4a0 [ixgbevf]\\n local_pci_probe+0x50/0xa0\\n work_for_cpu_fn+0x1a/0x30\\n [...]\\n\\nAdd ixgbevf_hv_negotiate_features_vf() that returns -EOPNOTSUPP and\\nwire it into ixgbevf_hv_mac_ops. The caller already handles -EOPNOTSUPP\\ngracefully.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2270ebab53128fb73c4a70a292be09094074737f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4821d563cd7f251ae728be1a6d04af82a294a5b9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4db7b61ec1d1b2b67c0881b62fc4f9583bc21484\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d8a747057a17ffc79e31df1abb11d05e1669d8e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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