CVE-2023-54104 mtd: rawnand: fsl_upm: Fix an off-by one test in fun_exec_op()
An off-by-one error in the Linux kernel's FSL UPM NAND driver allows out-of-bounds memory access, potentially causing crashes or undefined behavior.
- 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-2023-54104?
CVE-2023-54104 is a high-severity vulnerability in Linux, published on 24 Dec 2025. 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: fsl_upm: Fix an off-by one test in fun_exec_op()
'op-cs' is copied in 'fun->mchip_number' which is used to access the 'mchip_offsets' and the 'rnb_gpio' arrays. These arrays have NAND_MAX_CHIPS elements, so the index must be below this limit.
Fix the sanity check in order to avoid the NAND_MAX_CHIPS value. This would lead to out-of-bound accesses.
Which versions are affected by CVE-2023-54104?
How do I fix CVE-2023-54104?
Apply the vendor's patch.
Is CVE-2023-54104 being exploited?
There is no known exploitation of CVE-2023-54104 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-54104, DEBIAN-CVE-2023-54104, GHSA-39vf-5xqf-2xfv, UBUNTU-CVE-2023-54104.