CVE-2026-43094

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This leaves the function pointer NULL\non Hyper-V VMs.\n\nDuring probe, ixgbevf_negotiate_api() calls ixgbevf_set_features(),\nwhich unconditionally dereferences hw->mac.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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/intel/ixgbevf/vf.c"], "versions": [{"version": "871ac1cd4ce4804defcb428cbb003fd84c415ff4", "lessThan": "376d74ea03589914fbe2dedcbebf418396c04fd0", "status": "affected", "versionType": "git"}, {"version": "2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18", "lessThan": "d8a747057a17ffc79e31df1abb11d05e1669d8e5", "status": "affected", "versionType": "git"}, {"version": "bf580112ed61736c2645a893413a04732505d4b1", "lessThan": "2270ebab53128fb73c4a70a292be09094074737f", "status": "affected", "versionType": "git"}, {"version": "a7075f501bd33c93570af759b6f4302ef0175168", "lessThan": "4db7b61ec1d1b2b67c0881b62fc4f9583bc21484", "status": "affected", "versionType": "git"}, {"version": "a7075f501bd33c93570af759b6f4302ef0175168", "lessThan": "1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb", "status": "affected", "versionType": "git"}, {"version": "a7075f501bd33c93570af759b6f4302ef0175168", "lessThan": "4821d563cd7f251ae728be1a6d04af82a294a5b9", "status": "affected", "versionType": "git"}, {"version": "a376e29b1b196dc90b50df7e5e3947e3026300c4", "status": "affected", "versionType": "git"}, {"version": "6.1.158", "lessThan": "6.1.175", "status": "affected", "versionType": "semver"}, {"version": "6.6.114", "lessThan": "6.6.136", "status": "affected", "versionType": "semver"}, {"version": "6.12.55", "lessThan": "6.12.83", "status": "affected", "versionType": "semver"}, {"version": "6.17.5", "lessThan": "6.18", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/intel/ixgbevf/vf.c"], "versions": [{"version": "6.18", "status": "affected"}, {"version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.136", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.83", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.24", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.14", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.158", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.114", "versionEndExcluding": "6.6.136"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.55", "versionEndExcluding": "6.12.83"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "6.18.24"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "6.19.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17.5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/376d74ea03589914fbe2dedcbebf418396c04fd0"}, {"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", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:19:06.481Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - 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This leaves the function pointer NULL\non Hyper-V VMs.\n\nDuring probe, ixgbevf_negotiate_api() calls ixgbevf_set_features(),\nwhich unconditionally dereferences hw->mac.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. 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This leaves the function pointer NULL\non Hyper-V VMs.\n\nDuring probe, ixgbevf_negotiate_api() calls ixgbevf_set_features(),\nwhich unconditionally dereferences hw->mac.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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nixgbevf: a\u00f1adir la operaci\u00f3n negotiate_features faltante a la tabla de operaciones de Hyper-V\n\nEl commit a7075f501bd3 (\u2019ixgbevf: corregir la compatibilidad de la API del buz\u00f3n negociando las caracter\u00edsticas admitidas\u2019) a\u00f1adi\u00f3 la devoluci\u00f3n de llamada .negotiate_features a ixgbe_mac_operations y la pobl\u00f3 en ixgbevf_mac_ops, pero olvid\u00f3 a\u00f1adirla a ixgbevf_hv_mac_ops. Esto deja el puntero de funci\u00f3n NULL en m\u00e1quinas virtuales Hyper-V.\n\nDurante la sonda, ixgbevf_negotiate_api() llama a ixgbevf_set_features(), que desreferencia incondicionalmente hw -> mac.ops.negotiate_features(). En Hyper-V esto resulta en una desreferencia de puntero NULL:\n\n ERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000000\n [...]\n Nombre del hardware: M\u00e1quina virtual de Microsoft Corporation/M\u00e1quina virtual [...]\n Cola de trabajo: eventos work_for_cpu_fn\n RIP: 0010:0x0\n [...]\n Traza de llamada:\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\nA\u00f1adir ixgbevf_hv_negotiate_features_vf() que devuelve -EOPNOTSUPP y conectarla a ixgbevf_hv_mac_ops. El llamador ya maneja -EOPNOTSUPP de forma elegante."}], "id": "CVE-2026-43094", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43094", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T15:28:26.046237Z", "version": "2.0.3"}}]}, "published": "2026-05-06T10:16:22.790", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2270ebab53128fb73c4a70a292be09094074737f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/376d74ea03589914fbe2dedcbebf418396c04fd0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4821d563cd7f251ae728be1a6d04af82a294a5b9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4db7b61ec1d1b2b67c0881b62fc4f9583bc21484"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d8a747057a17ffc79e31df1abb11d05e1669d8e5"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ixgbevf: add missing negotiate_features op to Hyper-V ops table", "id": "2467006", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467006"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-824", "details": ["A flaw was found in the Linux kernel's ixgbevf driver. When running on Hyper-V virtual machines, a missing operation in the driver's Hyper-V operations table can lead to a null pointer dereference during feature negotiation. This vulnerability allows a local user to trigger a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-43094", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43094\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43094\nhttps://lore.kernel.org/linux-cve-announce/2026050619-CVE-2026-43094-25f5@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18,d8a747057a17ffc79e31df1abb11d05e1669d8e5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bf580112ed61736c2645a893413a04732505d4b1,2270ebab53128fb73c4a70a292be09094074737f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a7075f501bd33c93570af759b6f4302ef0175168,4db7b61ec1d1b2b67c0881b62fc4f9583bc21484)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a7075f501bd33c93570af759b6f4302ef0175168,1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a7075f501bd33c93570af759b6f4302ef0175168,4821d563cd7f251ae728be1a6d04af82a294a5b9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[871ac1cd4ce4804defcb428cbb003fd84c415ff4,*]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a376e29b1b196dc90b50df7e5c3947e3026300c4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.19.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-06T12:00:03.492311+00:00", "updated": "2026-05-19T21:30:14.356749+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-476", "CWE-824"]}