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NTAP-20261021-0001 — CVE-2026-99999 Linux Kernel Vulnerability in NetApp Products

Published 2026-10-21 · Updated 2026-10-21 · Status: Interim · Exploitation: Public · Severity: CRITICAL 9.3 · ONTAP affected: Yes

Official advisory: NTAP-20261021-0001 on security.netapp.com ↗. Affected versions, fixed releases, and workarounds live there — this page is a summary.

Product family: ONTAP · Baseboard management controllers · Brocade SAN firmware · Other NetApp products · NetApp Console / BlueXP · SolidFire / NetApp HCI · SnapCenter | ONTAP-relevant | highest CVSS: 9.3

CVEs in this advisory

CVE-2026-99999 — CRITICAL · CVSS 9.3 · site index

What the CVE records say

CVE-2026-99999 — In the Linux kernel, the following vulnerability has been resolved: ipv4: validate checksum_start before completing checksum If a packet with bad checksum metadata gets into the ipv4 stack, skb_checksum_help can corrupt the network header and cause a bunch of mischief. This was discovered and reported by Paulos, and has been reporoduced by others independently since. We really shouldn't allow such packets in, but as a defence in depth measure, let's also check before we complete the checksum. A more complete validation at input is forthcoming, but needs more work.

Impact

Successful exploitation of this vulnerability could lead to disclosure of sensitive information, addition or modification of data or Denial of Service (DoS).

Affected products

ONTAP Select Deploy administration utility
AFF Baseboard Management Controller (BMC) - A700s
Brocade Fabric Operating System Firmware
Cloud Volumes ONTAP Mediator
FAS/AFF BIOS - A900/9500
FAS/AFF Baseboard Management Controller (BMC) - 8300/8700/A400/C400
FAS/AFF Baseboard Management Controller (BMC) - A250/500f/C250
NetApp Console Agent OVA
NetApp HCI Baseboard Management Controller (BMC) - H610S
NetApp SolidFire & HCI Management Node
ONTAP tools for VMware vSphere 10
SnapCenter Plug-in for VMware vSphere

References

What to do

Check the affected products listed above against the official advisory's affected-versions table — that is where the exact ONTAP 9 release, ONTAP tool, or management product versions are named.
If affected and a fixed release exists, plan the upgrade — see the ONTAP upgrade runbook.
If exploitation is listed as "active", treat remediation as urgent and review exposure (management LIFs, ONTAP S3, SnapMirror endpoints).
Harden in parallel: security hardening baseline and ransomware protection on ONTAP.