Bug 2468109 (CVE-2026-43346)

Summary: CVE-2026-43346 kernel: ice: ptp: don't WARN when controlling PF is unavailable
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2026-05-08 14:04:57 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ice: ptp: don't WARN when controlling PF is unavailable

In VFIO passthrough setups, it is possible to pass through only a PF
which doesn't own the source timer. In that case the PTP controlling PF
(adapter->ctrl_pf) is never initialized in the VM, so ice_get_ctrl_ptp()
returns NULL and triggers WARN_ON() in ice_ptp_setup_pf().

Since this is an expected behavior in that configuration, replace
WARN_ON() with an informational message and return -EOPNOTSUPP.
Comment 1 Keith Grant 2026-05-08 19:35:47 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050837-CVE-2026-43346-ec5f@gregkh/T