CVE-2026-43432

/* * Conceptual PoC for CVE-2026-43432 Memory Leak * This snippet demonstrates the vulnerable logic flow. * Triggering this requires specific hardware state or emulation. */ #include <linux/module.h> #include <linux/usb.h> // Mocking the vulnerable structure struct xhci_command { struct completion *cmd_completion; void *in_ctx; }; // Vulnerable function simulation void vulnerable_xhci_disable_slot_simulation() { struct xhci_command *cmd; // Allocation similar to xhci_alloc_command(..., true) cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); if (!cmd) return; cmd->cmd_completion = kmalloc(sizeof(struct completion), GFP_KERNEL); if (!cmd->cmd_completion) { // Error path: Incorrectly freeing only 'cmd' kfree(cmd); // BUG: Leaks cmd_completion return; } // ... operation logic ... // Correct cleanup should be xhci_free_command(cmd) // which would free both cmd and cmd_completion } // Fix simulation void fixed_xhci_disable_slot_simulation() { struct xhci_command *cmd; cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); if (!cmd) return; cmd->cmd_completion = kmalloc(sizeof(struct completion), GFP_KERNEL); if (!cmd->cmd_completion) { // Fix: Use proper cleanup function if (cmd->in_ctx) kfree(cmd->in_ctx); kfree(cmd->cmd_completion); kfree(cmd); return; } }

{"cve": {"id": "CVE-2026-43432", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-08T15:16:55.470", "lastModified": "2026-05-20T18:18:34.580", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: xhci: Fix memory leak in xhci_disable_slot()\n\nxhci_alloc_command() allocates a command structure and, when the\nsecond argument is true, also allocates a completion structure.\nCurrently, the error handling path in xhci_disable_slot() only frees\nthe command structure using kfree(), causing the completion structure\nto leak.\n\nUse xhci_free_command() instead of kfree(). xhci_free_command() correctly\nfrees both the command structure and the associated completion structure.\nSince the command structure is allocated with zero-initialization,\ncommand->in_ctx is NULL and will not be erroneously freed by\nxhci_free_command().\n\nThis bug was found using an experimental static analysis tool we are\ndeveloping. The tool is based on the LLVM framework and is specifically\ndesigned to detect memory management issues. It is currently under\nactive development and not yet publicly available, but we plan to\nopen-source it after our research is published.\n\nThe bug was originally detected on v6.13-rc1 using our static analysis\ntool, and we have verified that the issue persists in the latest mainline\nkernel.\n\nWe performed build testing on x86_64 with allyesconfig using GCC=11.4.0.\nSince triggering these error paths in xhci_disable_slot() requires specific\nhardware conditions or abnormal state, we were unable to construct a test\ncase to reliably trigger these specific error paths at runtime."}], "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:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-401"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.221", "versionEndExcluding": "4.20", "matchCriteriaId": "901C8646-1860-4CD8-B70D-C02E4CAD5E2F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.165", "versionEndExcluding": "5.5", "matchCriteriaId": "86894268-9F63-47BD-A035-219EBC359D4E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.85", "versionEndExcluding": "5.10.253", "matchCriteriaId": "C5B6032E-F367-42A0-9B64-BE8D27AA93C8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.8", "versionEndExcluding": "5.15.203", "matchCriteriaId": "67ECAE40-42E2-489F-9E3A-EE55CD5D9A2F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.167", "matchCriteriaId": "2EDC6BAF-B710-4E26-B6AA-D68922EE7B43"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.130", "matchCriteriaId": "C57BB918-DF28-46B3-94F7-144176841267"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.78", "matchCriteriaId": "28D591F5-B196-4CC9-905C-DC80F116E7A8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.19", "matchCriteriaId": "D394AC60-6F28-435F-872A-CCDF384B8331"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.9", "matchCriteriaId": "E825E7C3-FEAC-4FD3-8A81-78D7387948C9"}, {"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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/078b446efc0f5e496c31bccb72b98af979963a83", "sourc ... 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