Bug 2502540 (CVE-2026-64080)

Summary: CVE-2026-64080 kernel: firmware: arm_ffa: Snapshot notifier callbacks under lock
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's ARM Firmware Framework for Arm (FFA) component. This vulnerability occurs because the system's notification handlers do not properly manage memory when processing callbacks. A timing issue can allow a callback to be unregistered and freed while it is still being accessed, leading to a use-after-free condition. This can result in system instability or unexpected behavior.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-07-19 17:05:06 UTC 
In the Linux kernel, the following vulnerability has been resolved:

firmware: arm_ffa: Snapshot notifier callbacks under lock

Both notification handlers currently look up a notifier callback under
notify_lock, drop the lock, and then dereference the returned
notifier entry. A concurrent unregister can delete and free that
entry in the gap, leaving the handler to dereference stale memory.

Copy the callback pointer and callback data while notify_lock is
still held and invoke the callback only after the lock is dropped.
This keeps the existing callback execution model while removing the
use-after-free window in both the framework and non-framework
notification paths.
Comment 1 TEJ RATHI 2026-07-20 15:06:42 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071915-CVE-2026-64080-7f28@gregkh/T