CVE-2026-64018 Details
Description
In the Linux kernel, the following vulnerability has been resolved: net: mana: validate rx_req_idx to prevent out-of-bounds array access In mana_hwc_rx_event_handler(), rx_req_idx is derived from sge->address in DMA-coherent memory. In Confidential VMs (SEV-SNP/TDX), this memory is shared unencrypted and HW can modify WQE contents at any time. No bounds check exists on rx_req_idx, which can lead to an out-of-bounds access into reqs[]. Add bounds check on rx_req_idx in mana_hwc_rx_event_handler() before using it to index the reqs[] array.
A vulnerability allowing out-of-bounds array access has been identified in the Linux kernel's Microsoft Azure Network Adapter (MANA) driver. This issue arises in the 'mana_hwc_rx_event_handler()' function, where the 'rx_req_idx' is calculated from 'sge->address' in DMA-coherent memory. In Confidential VMs (SEV-SNP/TDX), this memory is shared unencrypted, allowing hardware to alter Work Queue Element (WQE) contents at any time. The lack of a bounds check on 'rx_req_idx' can lead to unauthorized access into the 'reqs[]' array, potentially causing memory corruption or other unintended behavior.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been patched. The patch is included in the official Linux Git repository.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
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Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
No affected product data is available for this CVE.
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 20, 2026 | CVE Modified | kernel.org |
| Jul 19, 2026 | New CVE Received | kernel.org |