---
id: CVE-2023-53800
title: 'ubi: Fix use-after-free when volume resizing failed'
summary: |-
  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:
    ===========================================================…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 <
    bf9875aa7f7d624a8c084425b14bf7e5907ebc30
  - >-
    Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 <
    bf795ebbb9995e2fe7945de71177f01c2f1215dc
  - >-
    Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 <
    9c8be1f165baee53b5a36ea0b3c9281d403a1d0b
  - >-
    Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 <
    35f8d4064e54c18424db2997059d4c0b1d13d093
  - >-
    Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 <
    53818746e549e61841428892a8d94344494be797
  - >-
    Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 <
    b0c951742348d216f094d16ed4f70ae73db881c0
  - >-
    Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 <
    3d6378f7056ac7350338f941001162a8f660853c
  - >-
    Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 <
    9af31d6ec1a4be4caab2550096c6bd2ba8fba472
  - Linux 2.6.22
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T21:37:18.314683Z'
published: '2025-12-09'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T21:41:36.295Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-53800'
references:
  - url: 'https://git.kernel.org/stable/c/bf9875aa7f7d624a8c084425b14bf7e5907ebc30'
  - url: 'https://git.kernel.org/stable/c/bf795ebbb9995e2fe7945de71177f01c2f1215dc'
  - url: 'https://git.kernel.org/stable/c/9c8be1f165baee53b5a36ea0b3c9281d403a1d0b'
  - url: 'https://git.kernel.org/stable/c/35f8d4064e54c18424db2997059d4c0b1d13d093'
  - url: 'https://git.kernel.org/stable/c/53818746e549e61841428892a8d94344494be797'
  - url: 'https://git.kernel.org/stable/c/b0c951742348d216f094d16ed4f70ae73db881c0'
  - url: 'https://git.kernel.org/stable/c/3d6378f7056ac7350338f941001162a8f660853c'
  - url: 'https://git.kernel.org/stable/c/9af31d6ec1a4be4caab2550096c6bd2ba8fba472'
tags:
  - cve.org
epss: 0.00139
epssPercentile: 0.02892
ingestedAt: '2026-10-15T22:48:25.422Z'
---

## Overview

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.

## Affected

- `Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 < bf9875aa7f7d624a8c084425b14bf7e5907ebc30`
- `Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 < bf795ebbb9995e2fe7945de71177f01c2f1215dc`
- `Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 < 9c8be1f165baee53b5a36ea0b3c9281d403a1d0b`
- `Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 < 35f8d4064e54c18424db2997059d4c0b1d13d093`
- `Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 < 53818746e549e61841428892a8d94344494be797`
- `Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 < b0c951742348d216f094d16ed4f70ae73db881c0`
- `Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 < 3d6378f7056ac7350338f941001162a8f660853c`
- `Linux >= 801c135ce73d5df1caf3eca35b66a10824ae0707 < 9af31d6ec1a4be4caab2550096c6bd2ba8fba472`
- `Linux 2.6.22`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.