CVE-2026-98583 nfc: nfcmrvl: validate helper command length before pull
A missing length check in the Linux kernel NFC driver allows attackers to cause a denial of service via malformed packets.
- 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-2026-98583?
CVE-2026-98583 is a denial of service vulnerability in Linux, published on 18 Oct 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:
nfc: nfcmrvl: validate helper command length before pull
The firmware download receive path removes the NCI data header and reads the helper command before validating the remaining packet length. A short frame can therefore reach the data access before the malformed packet is rejected.
Validate the complete helper command length before stripping the NCI data header.
Which versions are affected by CVE-2026-98583?
How do I fix CVE-2026-98583?
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-2026-98583 being exploited?
There is no known exploitation of CVE-2026-98583 in the wild and no public exploit code.
Sources
Also known as AZL-108783, BELL-CVE-2026-98583, DEBIAN-CVE-2026-98583, GHSA-fgwh-2g3x-83j6, UBUNTU-CVE-2026-98583.