{"id":"CVE-2026-43094","state":"PUBLISHED","title":"ixgbevf: add missing negotiate_features op to Hyper-V ops table","description":"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->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.","publishedAt":"2026-05-06T07:40:25.930Z","updatedAt":"2026-10-15T01:19:06.481Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"871ac1cd4ce4804defcb428cbb003fd84c415ff4","status":"affected","lessThan":"376d74ea03589914fbe2dedcbebf418396c04fd0","versionType":"git"},{"version":"2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18","status":"affected","lessThan":"d8a747057a17ffc79e31df1abb11d05e1669d8e5","versionType":"git"},{"version":"bf580112ed61736c2645a893413a04732505d4b1","status":"affected","lessThan":"2270ebab53128fb73c4a70a292be09094074737f","versionType":"git"},{"version":"a7075f501bd33c93570af759b6f4302ef0175168","status":"affected","lessThan":"4db7b61ec1d1b2b67c0881b62fc4f9583bc21484","versionType":"git"},{"version":"a7075f501bd33c93570af759b6f4302ef0175168","status":"affected","lessThan":"1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb","versionType":"git"},{"version":"a7075f501bd33c93570af759b6f4302ef0175168","status":"affected","lessThan":"4821d563cd7f251ae728be1a6d04af82a294a5b9","versionType":"git"},{"version":"a376e29b1b196dc90b50df7e5e3947e3026300c4","status":"affected","versionType":"git"},{"version":"6.1.158","status":"affected","lessThan":"6.1.175","versionType":"semver"},{"version":"6.6.114","status":"affected","lessThan":"6.6.136","versionType":"semver"},{"version":"6.12.55","status":"affected","lessThan":"6.12.83","versionType":"semver"},{"version":"6.17.5","status":"affected","lessThan":"6.18","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/intel/ixgbevf/vf.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.136","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.83","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/intel/ixgbevf/vf.c"]}],"references":["https://git.kernel.org/stable/c/376d74ea03589914fbe2dedcbebf418396c04fd0","https://git.kernel.org/stable/c/d8a747057a17ffc79e31df1abb11d05e1669d8e5","https://git.kernel.org/stable/c/2270ebab53128fb73c4a70a292be09094074737f","https://git.kernel.org/stable/c/4db7b61ec1d1b2b67c0881b62fc4f9583bc21484","https://git.kernel.org/stable/c/1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb","https://git.kernel.org/stable/c/4821d563cd7f251ae728be1a6d04af82a294a5b9","https://cert-portal.siemens.com/productcert/html/ssa-784472.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43094.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43094","state":"PUBLISHED","datePublished":"2026-05-06T07:40:25.930Z","dateUpdated":"2026-10-15T01:19:06.481Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.984Z"},"containers":{"cna":{"title":"ixgbevf: add missing negotiate_features op to Hyper-V ops table","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->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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"871ac1cd4ce4804defcb428cbb003fd84c415ff4","status":"affected","lessThan":"376d74ea03589914fbe2dedcbebf418396c04fd0","versionType":"git"},{"version":"2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18","status":"affected","lessThan":"d8a747057a17ffc79e31df1abb11d05e1669d8e5","versionType":"git"},{"version":"bf580112ed61736c2645a893413a04732505d4b1","status":"affected","lessThan":"2270ebab53128fb73c4a70a292be09094074737f","versionType":"git"},{"version":"a7075f501bd33c93570af759b6f4302ef0175168","status":"affected","lessThan":"4db7b61ec1d1b2b67c0881b62fc4f9583bc21484","versionType":"git"},{"version":"a7075f501bd33c93570af759b6f4302ef0175168","status":"affected","lessThan":"1455ff8809843e6e83f1f5b5c0bcc2224c99a3cb","versionType":"git"},{"version":"a7075f501bd33c93570af759b6f4302ef0175168","status":"affected","lessThan":"4821d563cd7f251ae728be1a6d04af82a294a5b9","versionType":"git"},{"version":"a376e29b1b196dc90b50df7e5e3947e3026300c4","status":"affected","versionType":"git"},{"version":"6.1.158","status":"affected","lessThan":"6.1.175","versionType":"semver"},{"version":"6.6.114","status":"affected","lessThan":"6.6.136","versionType":"semver"},{"version":"6.12.55","status":"affected","lessThan":"6.12.83","versionType":"semver"},{"version":"6.17.5","status":"affected","lessThan":"6.18","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/intel/ixgbevf/vf.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.136","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.83","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/intel/ixgbevf/vf.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-01T16:14:38.068Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"affected":[{"vendor":"Siemens","product":"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]}],"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}],"providerMetadata":{"shortName":"siemens-SADP","orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","dateUpdated":"2026-10-15T01:19:06.481Z"},"x_adpType":"supplier"}]}}}