# CVE-2023-52449: linux: In the Linux kernel, the following vulnerability has been resolved:  mtd: Fix gluebi NULL pointer dereference caused...

CVE-2023-52449 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52449, released February 22, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-52449
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 22, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  mtd: Fix gluebi NULL pointer dereference caused by ftl notifier  If both ftl.ko and gluebi.ko are loaded, the notifier of ftl triggers NULL pointer dereference when trying to access ‘gluebi->desc’ in gluebi_read().  ubi_gluebi_init   ubi_register_volume_notifier     ubi_enumerate_volumes       ubi_notify_all         gluebi_notify    nb->notifier_call()           gluebi_create             mtd_device_register               mtd_device_parse_register                 add_mtd_device                   blktrans_notify_add   not->add()                     ftl_add_mtd         tr->add_mtd()                       scan_header                         mtd_read                           mtd_read_oob                             mtd_read_oob_std                               gluebi_read   mtd->read()                                 gluebi->desc - NULL  Detailed reproduction information available at the Link [1],  In the normal case, obtain gluebi->desc in the gluebi_get_device(), and access gluebi->desc in the gluebi_read(). However, gluebi_get_device() is not executed in advance in the ftl_add_mtd() process, which leads to NULL pointer dereference.  The solution for the gluebi module is to run jffs2 on the UBI volume without considering working with ftl or mtdblock [2]. Therefore, this problem can be avoided by preventing gluebi from creating the mtdblock device after creating mtd partition of the type MTD_UBIVOLUME.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.76-1 | [DEBIAN-CVE-2023-52449](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52449.md) | Feb 22, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.6.15-1 | [DEBIAN-CVE-2023-52449](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52449.md) | Feb 22, 2024 |
| Linux | linux Debian 14 | 6.6.15-1 | [DEBIAN-CVE-2023-52449](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52449.md) | Feb 22, 2024 |

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