CVE-2026-23054
Unknown Unknown - Not Provided
Improper RSS Hash Key Validation in Linux netvsc Causes Hang

Publication date: 2026-02-04

Last updated on: 2026-02-06

Assigner: kernel.org

Description
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.
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Meta Information
Published
2026-02-04
Last Modified
2026-02-06
Generated
2026-06-16
AI Q&A
2026-02-04
EPSS Evaluated
2026-06-14
NVD
CVE-2026-23054
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's hv_netvsc network driver. It occurs because the driver accepts RSS (Receive Side Scaling) hash key updates even when the device does not have a valid RX indirection table allocated. Specifically, when the device reports only a single receive queue, the function rndis_filter_device_add() does not allocate this table. Accepting RSS hash key updates in this state causes the system to hang.

The fix involves modifying the netvsc_set_rxfh() function to check for the presence of the RX indirection table size (ndc->rx_table_sz) and return an error (-EOPNOTSUPP) if the table is absent. This ensures that RSS hash key programming is only allowed when the device supports it, preventing the hang.

Impact Analysis

This vulnerability can cause the affected Linux system to hang when RSS hash key updates are applied without a valid RX indirection table. A system hang can lead to denial of service, disrupting network operations and potentially requiring a system reboot to recover.

Compliance Impact

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Detection Guidance

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Mitigation Strategies

The vulnerability is fixed by ensuring that RSS hash key programming is only accepted when a valid RX indirection table is present. To mitigate this vulnerability immediately, update your Linux kernel to a version that includes the fix which gates netvsc_set_rxfh() on the presence of the RX indirection table and returns -EOPNOTSUPP when the table is absent.

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