CVE-2026-23434 mtd: rawnand: serialize lock/unlock against other NAND operations
A race condition in the Linux kernel NAND driver can cause controller conflicts and denial of service during concurrent lock/unlock and erase operations.
- 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-2026-23434?
CVE-2026-23434 is a high-severity vulnerability in Linux kernel, published on 3 Apr 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:
mtd: rawnand: serialize lock/unlock against other NAND operations
nand_lock() and nand_unlock() call into chip->ops.lock_area/unlock_area without holding the NAND device lock. On controllers that implement SET_FEATURES via multiple low-level PIO commands, these can race with concurrent UBI/UBIFS background erase/write operations that hold the device lock, resulting in cmd_pending conflicts on the NAND controller.
Add nand_get_device()/nand_release_device() around the lock/unlock operations to serialize them against all other NAND controller access.
Weakness: CWE-362
Which versions are affected by CVE-2026-23434?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23434?
Apply the vendor's patch.
Is CVE-2026-23434 being exploited?
There is no known exploitation of CVE-2026-23434 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-23434, DEBIAN-CVE-2026-23434, GHSA-f5hq-62qq-fgrw, ROOT-OS-DEBIAN-11-CVE-2026-23434, ROOT-OS-DEBIAN-12-CVE-2026-23434, ROOT-OS-DEBIAN-13-CVE-2026-23434 and 3 more.