CVE-2026-64018 net: mana: validate rx_req_idx to prevent out-of-bounds array access
An attacker with hardware control can trigger an out-of-bounds array access in the Linux kernel's MANA driver, potentially leading to code execution or system crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64018?
CVE-2026-64018 is a critical memory corruption vulnerability in Linux kernel, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-64018?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64018?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-64018 being exploited?
There is no known exploitation of CVE-2026-64018 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-64018, DEBIAN-CVE-2026-64018, GHSA-r2vm-q278-6vpv, UBUNTU-CVE-2026-64018.