Bug 2468064 (CVE-2026-43343)

Summary: CVE-2026-43343 kernel: usb: gadget: f_subset: Fix unbalanced refcnt in geth_free
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the `usb: gadget: f_subset` module of the Linux kernel. The `geth_free()` function fails to decrement a reference count that was incremented by `geth_alloc()`. This unbalanced reference count can lead to a resource leak, preventing the configuration of attributes through the configfs interface after a function has been unlinked. This can result in a denial of service for specific USB gadget configurations.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-05-08 14:02:41 UTC
In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: f_subset: Fix unbalanced refcnt in geth_free

geth_alloc() increments the reference count, but geth_free() fails to
decrement it. This prevents the configuration of attributes via configfs
after unlinking the function.

Decrement the reference count in geth_free() to ensure proper cleanup.