CVE-2026-80642

Technical Description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References