Bug 2436818 (CVE-2026-23054)

Summary: CVE-2026-23054 kernel: net: hv_netvsc: reject RSS hash key programming without RX indirection table
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2026-02-04 17:04:53 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: hv_netvsc: reject RSS hash key programming without RX indirection table

RSS configuration requires a valid RX indirection table. When the device
reports a single receive queue, rndis_filter_device_add() does not
allocate an indirection table, accepting RSS hash key updates in this
state leads to a hang.

Fix this by gating netvsc_set_rxfh() on ndc->rx_table_sz and return
-EOPNOTSUPP when the table is absent. This aligns set_rxfh with the device
capabilities and prevents incorrect behavior.
Comment 1 TEJ RATHI 2026-02-05 06:44:24 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026020451-CVE-2026-23054-3712@gregkh/T