# CVE-2023-53800: linux: In the Linux kernel, the following vulnerability has been resolved:  ubi: Fix use-after-free when volume resizing fai...

CVE-2023-53800 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-53800, released December 9, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-53800
- 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:  ubi: Fix use-after-free when volume resizing failed  There is an use-after-free problem reported by KASAN:   ==================================================================   BUG: KASAN: use-after-free in ubi_eba_copy_table+0x11f/0x1c0 [ubi]   Read of size 8 at addr ffff888101eec008 by task ubirsvol/4735    CPU: 2 PID: 4735 Comm: ubirsvol   Not tainted 6.1.0-rc1-00003-g84fa3304a7fc-dirty #14   Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),   BIOS 1.14.0-1.fc33 04/01/2014   Call Trace:    <TASK>    dump_stack_lvl+0x34/0x44    print_report+0x171/0x472    kasan_report+0xad/0x130    ubi_eba_copy_table+0x11f/0x1c0 [ubi]    ubi_resize_volume+0x4f9/0xbc0 [ubi]    ubi_cdev_ioctl+0x701/0x1850 [ubi]    __x64_sys_ioctl+0x11d/0x170    do_syscall_64+0x35/0x80    entry_SYSCALL_64_after_hwframe+0x46/0xb0    </TASK>  When ubi_change_vtbl_record() returns an error in ubi_resize_volume(), "new_eba_tbl" will be freed on error handing path, but it is holded by "vol->eba_tbl" in ubi_eba_replace_table(). It means that the liftcycle of "vol->eba_tbl" and "vol" are different, so when resizing volume in next time, it causing an use-after-free fault.  Fix it by not freeing "new_eba_tbl" after it replaced in ubi_eba_replace_table(), while will be freed in next volume resizing.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.20-1 | [DEBIAN-CVE-2023-53800](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53800.md) | Dec 9, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.20-1 | [DEBIAN-CVE-2023-53800](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53800.md) | Dec 9, 2025 |
| Linux | linux Debian 14 | 6.1.20-1 | [DEBIAN-CVE-2023-53800](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53800.md) | Dec 9, 2025 |

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