# CVE-2023-54087: ubi: Fix possible null-ptr-deref in ubi\_free\_volume()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-12-24 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.22

## Description

In the Linux kernel, the following vulnerability has been resolved: ubi: Fix possible null-ptr-deref in ubi_free_volume() It willl cause null-ptr-deref in the following case: uif_init() ubi_add_volume() cdev_add() -> if it fails, call kill_volumes() device_register() kill_volumes() -> if ubi_add_volume() fails call this function ubi_free_volume() cdev_del() device_unregister() -> trying to delete a not added device, it causes null-ptr-deref So in ubi_free_volume(), it delete devices whether they are added or not, it will causes null-ptr-deref. Handle the error case whlie calling ubi_add_volume() to fix this problem. If add volume fails, set the corresponding vol to null, so it can not be accessed in kill_volumes() and release the resource in ubi_add_volume() error path.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
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## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/5558bcf1c58720ca6e9d6198d921cb3aa337f038
- https://git.kernel.org/stable/c/45b2c5ca4d2edae70f19fdb086bd927840c4c309
- https://git.kernel.org/stable/c/234c53e57424992e657e6f4acc00d3df0983176f
- https://git.kernel.org/stable/c/fcbc795abe7897da4b5d2a6ab5010e36774b00c2
- https://git.kernel.org/stable/c/5ec4c8aca5a221756a9007deadfea92795319fee
- https://git.kernel.org/stable/c/2ea7195b195009ecf0046e55361f393ba96d02db
- https://git.kernel.org/stable/c/9eccdb0760cbcb4427b5303a83a3007de998af51
- https://git.kernel.org/stable/c/c15859bfd326c10230f09cb48a17f8a35f190342

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