High [CVE-2026-64018] validate rx_req_idx to prevent out-of-bounds array access
This high-severity Red Hat Linux advisory covers CVE-2026-64018 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
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 flaw was found in the Linux kernel's mana network driver. In Confidential Virtual Machines (VMs), a missing bounds check when processing network events can allow a malicious hardware component or a compromised VM to write data outside of an intended memory region.
This out-of-bounds access could lead to system instability or a denial of service. Red Hat severity: Important — CVSS 8.7 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:H).
Weakness: CWE-787. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
Red Hat fixing advisory: RHSA-2026:61887, RHSA-2026:63013, RHSA-2026:63014, RHSA-2026:63129.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
- kernel-0:6.12.0-211.50.1.el10_2
- kernel-rt-0:4.18.0-553.159.1.rt7.500.el8_10
- kernel-0:4.18.0-553.159.1.el8_10
- kernel-0:5.14.0-687.44.1.el9_8
- RHSA-2026:61887
- RHSA-2026:63013
- RHSA-2026:63014
- RHSA-2026:63129
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
Mitigation checklist
- To mitigate this issue, prevent the 'mana' kernel module from loading if it is not required for your system's operation, especially in Confidential VM environments. 1. Create a file named `/etc/modprobe.d/disable-mana.conf` with the following content: `blacklist mana` 2. Rebuild the initramfs: `dracut -f -v` 3. Reboot the system for the changes to take effect. Warning: This action may impact network functionality if the 'mana' driver is essential for the system's network operations. A system reboot is required for the changes to be applied.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
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