# CVE-2023-54087: linux: In the Linux kernel, the following vulnerability has been resolved:  ubi: Fix possible null-ptr-deref in ubi_free_vol...

CVE-2023-54087 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-54087, released December 24, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-54087
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 24, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.20-1 | [DEBIAN-CVE-2023-54087](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54087.md) | Dec 24, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.20-1 | [DEBIAN-CVE-2023-54087](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54087.md) | Dec 24, 2025 |
| Linux | linux Debian 14 | 6.1.20-1 | [DEBIAN-CVE-2023-54087](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54087.md) | Dec 24, 2025 |

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