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CVE Record

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

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue can hang networking behavior when RSS hash key settings are accepted on a device state that lacks the required receive indirection table. The business impact is primarily availability, not confirmed data theft or remote code execution.

Executive priority

Prioritize routine-to-expedited patching where affected Linux hosts support important services or industrial environments. Escalate only if vendor advisories identify critical products or operational exposure.

Technical view

The hv_netvsc/netvsc path accepted set_rxfh RSS hash key updates even when ndc->rx_table_sz indicated no RX indirection table was allocated, such as single receive queue devices. The fix rejects that operation with EOPNOTSUPP.

Likely exposure

Exposure appears limited to Linux systems using the affected hv_netvsc/netvsc network driver conditions. The bundle lists Linux kernel versions/ranges as affected, but downstream distribution and appliance exposure must be confirmed through vendor advisories.

Exploitation context

The source bundle does not show CISA KEV listing, active exploitation, public exploit evidence, or CVSS scoring. The described failure mode is a hang triggered by invalid RSS configuration handling.

Researcher notes

Key evidence is the upstream kernel resolution: netvsc_set_rxfh now gates on rx_table_sz and returns EOPNOTSUPP when the RX indirection table is absent. No exploitability details beyond hang behavior are provided.

Mitigation direction

  • Apply Linux kernel stable fixes referenced for CVE-2026-23054.
  • Use distribution or appliance vendor updates rather than raw upstream assumptions.
  • Review Siemens SSA-019113 if Siemens products are in scope.
  • Restrict RSS/network tuning privileges to trusted administrators.
  • Avoid unsupported RSS hash-key changes on affected systems until patched.

Validation and detection

  • Inventory Linux kernel versions against vendor advisories for CVE-2026-23054.
  • Identify systems using hv_netvsc or netvsc networking paths.
  • Confirm patched builds include the referenced stable kernel commits.
  • In a lab, verify unsupported RSS updates are rejected, not hung.
  • Document affected Siemens products separately using SSA-019113.
Prepared
Confidence
medium
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2026-23054 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
1ADP providers
7Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux962f3fee83a4ef9010ae84dc43ae7aecb572e2a9, 962f3fee83a4ef9010ae84dc43ae7aecb572e2a9, 962f3fee83a4ef9010ae84dc43ae7aecb572e2a9, 962f3fee83a4ef9010ae84dc43ae7aecb572e2a9, 962f3fee83a4ef9010ae84dc43ae7aecb572e2a9unaffected
LinuxLinux4.11, 0, 6.1.162, 6.6.122, 6.12.67, 6.18.7, 6.19affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.