CVE-2026-53336 nvmem: layouts: onie-tlv: fix hang on unknown types
A local attacker with physical access or control over EEPROM data can cause a system hang in the Linux kernel's ONIE TLV driver by triggering an infinite loop with unknown entry types.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53336?
CVE-2026-53336 is a medium-severity denial of service vulnerability in Linux kernel, published on 1 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:
nvmem: layouts: onie-tlv: fix hang on unknown types
The EEPROM on my board has a vendor specific entry of type 0x41. When stumbling upon that, this driver hangs in an endless loop.
Fix it by keep incrementing the offset on unknown entries, so the loop will eventually stop.
Which versions are affected by CVE-2026-53336?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53336?
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-2026-53336 being exploited?
There is no known exploitation of CVE-2026-53336 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-53336, DEBIAN-CVE-2026-53336, GHSA-hm49-92mv-rrfr, ROOT-OS-UBUNTU-2404-CVE-2026-53336, UBUNTU-CVE-2026-53336.