What’s Vulnerable › Vulnerabilities

CVE-2026-23054: net: hv_netvsc: reject RSS hash key programming without RX indirection table

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-04 · updated 2026-10-15

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.

Affected products

• Linux kernel: 4.11 — fixed in 6.19

How to fix

Upgrade to a fixed version: Linux kernel 6.19. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/11dd9a9ef4dc4507a15a69b8511a0013c6c28fa3
• https://git.kernel.org/stable/c/4cd55c609e85ae2313248ef1a33619a3eef44a16
• https://git.kernel.org/stable/c/8288136f508e78eb3563e7073975999cf225a2f9
• https://git.kernel.org/stable/c/82c9039c8ebb715753a40434df714f865a3aec9c
• https://git.kernel.org/stable/c/d23564955811da493f34412d7de60fa268c8cb50
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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