Linux Kernel xhci: Fixing Memory Leak in xhci_disable_slot()
CVE-2026-43432 Published on May 8, 2026
usb: xhci: Fix memory leak in xhci_disable_slot()
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.
Products Associated with CVE-2026-43432
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Affected Versions
Linux:- Version fee8be5bde562d4f5f9a100ca80c6d7072ed34c8 and below 1e800e26d54ccf2ddf2ea6d6cbe021c804d8aa62 is affected.
- Version 02d5a2a48bb44e7404b794df87e57588b2fd604e and below 6288baf0c8c4dcfbf206773aede9c1f2269cec28 is affected.
- Version 7faac1953ed1f658f719cdf7bb7303fa5eef822c and below 46aea90763832cd6e9b0c2e1c00e6a9512156d4b is affected.
- Version 7faac1953ed1f658f719cdf7bb7303fa5eef822c and below 2e2baa8fb5aa4d080cbfeb84c51eff797529f413 is affected.
- Version 7faac1953ed1f658f719cdf7bb7303fa5eef822c and below 807e4fb5140c73eb5dba1e399a990db5c1f3cdf8 is affected.
- Version 7faac1953ed1f658f719cdf7bb7303fa5eef822c and below c65f1b840ab8ce72ba68f1b63bab7960f8fdfa89 is affected.
- Version 7faac1953ed1f658f719cdf7bb7303fa5eef822c and below 078b446efc0f5e496c31bccb72b98af979963a83 is affected.
- Version 7faac1953ed1f658f719cdf7bb7303fa5eef822c and below c1c8550e70401159184130a1afc6261db01fc0ce is affected.
- Version cc7c2818c71ebace207df40cc586c8c74e3d1a59 is affected.
- Version ec0cddcc2454ab08193beb473978f8f8889b7e24 is affected.
- Version 5.16 is affected.
- Before 5.16 is unaffected.
- Version 5.10.253, <= 5.10.* is unaffected.
- Version 5.15.203, <= 5.15.* is unaffected.
- Version 6.1.167, <= 6.1.* is unaffected.
- Version 6.6.130, <= 6.6.* is unaffected.
- Version 6.12.78, <= 6.12.* is unaffected.
- Version 6.18.19, <= 6.18.* is unaffected.
- Version 6.19.9, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.