# CVE-2023-53804: linux: In the Linux kernel, the following vulnerability has been resolved:  nilfs2: fix use-after-free bug of nilfs_root in...

CVE-2023-53804 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-53804, released December 9, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-53804
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0014
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 9, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  nilfs2: fix use-after-free bug of nilfs_root in nilfs_evict_inode()  During unmount process of nilfs2, nothing holds nilfs_root structure after nilfs2 detaches its writer in nilfs_detach_log_writer().  However, since nilfs_evict_inode() uses nilfs_root for some cleanup operations, it may cause use-after-free read if inodes are left in "garbage_list" and released by nilfs_dispose_list() at the end of nilfs_detach_log_writer().  Fix this issue by modifying nilfs_evict_inode() to only clear inode without additional metadata changes that use nilfs_root if the file system is degraded to read-only or the writer is detached.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.37-1 | [DEBIAN-CVE-2023-53804](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53804.md) | Dec 9, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.3.7-1 | [DEBIAN-CVE-2023-53804](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53804.md) | Dec 9, 2025 |
| Linux | linux Debian 14 | 6.3.7-1 | [DEBIAN-CVE-2023-53804](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53804.md) | Dec 9, 2025 |

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