CVE-2026-43097

/* * PoC Concept for CVE-2026-43097 * This PoC demonstrates the logic required to trigger the double free. * It requires a Hyper-V environment to load the vulnerable driver. */ #include <linux/module.h> #include <linux/kernel.h> // Simulating the condition that forces hv_pci_probe to fail // after allocating domain_nr. static int __init poc_init(void) { printk(KERN_INFO "Attempting to trigger CVE-2026-43097\n"); // In a real exploit scenario, this would involve: // 1. Loading the pci-hyperv driver. // 2. Interacting with VMBus to trigger probe failure. // 3. Observing the kernel panic/warning regarding ida_free. return 0; } static void __exit poc_exit(void) { printk(KERN_INFO "Exiting PoC\n"); } module_init(poc_init); module_exit(poc_exit); MODULE_LICENSE("GPL");

{"cve": {"id": "CVE-2026-43097", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T10:16:23.137", "lastModified": "2026-05-14T19:24:49.477", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: hv: Fix double ida_free in hv_pci_probe error path\n\nIf hv_pci_probe() fails after storing the domain number in\nhbus->bridge->domain_nr, there is a call to free this domain_nr via\npci_bus_release_emul_domain_nr(), however, during cleanup, the bridge\nrelease callback pci_release_host_bridge_dev() also frees the domain_nr\ncausing ida_free to be called on same ID twice and triggering following\nwarning:\n\n ida_free called for id=28971 which is not allocated.\n WARNING: lib/idr.c:594 at ida_free+0xdf/0x160, CPU#0: kworker/0:2/198\n Call Trace:\n pci_bus_release_emul_domain_nr+0x17/0x20\n pci_release_host_bridge_dev+0x4b/0x60\n device_release+0x3b/0xa0\n kobject_put+0x8e/0x220\n devm_pci_alloc_host_bridge_release+0xe/0x20\n devres_release_all+0x9a/0xd0\n device_unbind_cleanup+0x12/0xa0\n really_probe+0x1c5/0x3f0\n vmbus_add_channel_work+0x135/0x1a0\n\nFix this by letting pci core handle the free domain_nr and remove\nthe explicit free called in pci-hyperv driver."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-415"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.14", "matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/21bc8e0ba5c2a081b0a2808c976d4c9dbddf1e48", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b6422dff0e518245019233432b6bccfc30b73e2f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}