Bug 2555137 (CVE-2026-98692)

Summary: CVE-2026-98692 kernel: thunderbolt: Make the DP tunnel activation callback mandatory
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, 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 Thunderbolt subsystem. DisplayPort (DP) tunnels activated without a required completion callback fail to release object references during tunnel setup, such as when restoring from system hibernation. A local user or repeated hibernation cycles can cause kernel references to remain permanently allocated, leading to a memory leak and a potential Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description OSIDB Bzimport 2026-10-18 15:56:32 UTC 
In the Linux kernel, the following vulnerability has been resolved:

thunderbolt: Make the DP tunnel activation callback mandatory

tb_tunnel_alloc_dp() takes an optional callback which is run from
dprx_work once the DPRX capabilities read has completed. Without that
callback tb_dp_dprx_start() reads the capabilities synchronously and
never queues the work. It however always takes a tunnel reference which
is only dropped by dprx_work itself or by tb_dp_dprx_stop() when
cancel_delayed_work() actually canceled that work. That reference is
thus leaked for every tunnel without a callback.

The only tunnels without one are those from tb_tunnel_discover_dp(),
which are activated again when restoring from hibernation.
Pass the callback to tb_tunnel_discover_dp() as well and drop the
synchronous path such that the DPRX capabilities are always read from
dprx_work. Hibernation restore then also no longer blocks for up to 12
seconds while waiting for that read to complete.

Also fix up the KUnit tests.
Comment 1 Mauro Matteo Cascella 2026-10-22 03:56:14 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98692.mbox