CVE-2026-43432
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: usb: xhci: Fix memory leak in xhci_disable_slot() xhci_alloc_command() allocates a command structure and, when the second argument is true, also allocates a completion structure. Currently, the error handling path in xhci_disable_slot() only frees the command structure using kfree(), causing the completion structure to leak. Use xhci_free_command() instead of kfree(). xhci_free_command() correctly frees both the command structure and the associated completion structure. Since the command structure is allocated with zero-initialization, command->in_ctx is NULL and will not be erroneously freed by xhci_free_command(). This bug was found using an experimental static analysis tool we are developing. The tool is based on the LLVM framework and is specifically designed to detect memory management issues. It is currently under active development and not yet publicly available, but we plan to open-source it after our research is published. The bug was originally detected on v6.13-rc1 using our static analysis tool, and we have verified that the issue persists in the latest mainline kernel. We performed build testing on x86_64 with allyesconfig using GCC=11.4.0. Since triggering these error paths in xhci_disable_slot() requires specific hardware conditions or abnormal state, we were unable to construct a test case to reliably trigger these specific error paths at runtime.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-05-08 15:16:55.470000
Last modified
2026-11-06 16:18:40.370000
View original CVE JSON
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"published": "2026-05-08T15:16:55.470",
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"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."
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