CVE-2026-74693 net: prestera: validate firmware header length
A missing length check in the Prestera network driver allows a local attacker to cause a denial of service by providing a malformed firmware image.
- 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-2026-74693?
CVE-2026-74693 is a denial of service vulnerability in Linux, published on 22 Aug 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: prestera: validate firmware header length
prestera_fw_hdr_parse() reads the firmware header before checking that the firmware image contains that header.
Reject images shorter than struct prestera_fw_header before decoding the magic and version fields.
Which versions are affected by CVE-2026-74693?
How do I fix CVE-2026-74693?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-74693 being exploited?
There is no known exploitation of CVE-2026-74693 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74693, DEBIAN-CVE-2026-74693, GHSA-2mgx-rhg3-xxxf, UBUNTU-CVE-2026-74693.