CVE-2026-80642

In the Linux kernel, the following vulnerability has been resolved:

liveupdate: Reference count incoming FLB data

Increment the incoming FLB refcount in liveupdate_flb_get_incoming() so

that the FLB structure cannot be freed while the caller is actively using

it. Add an additional liveupdate_flb_put_incoming() function so the

caller can explicitly indicate when it is done using the FLB data.

During a Live Update, a subsystem might need to hold onto the incoming

File-Lifecycle-Bound (FLB) data for an extended period, such as during

device enumeration. Incrementing the reference count guarantees that the

data remains valid and accessible until the subsystem releases it,

preventing future use-after-free bugs.