---
title: "CVE-2026-93798: Linux Kernel - Race Condition"
description: "Linux kernel contains a memory barrier issue in btrfs merge_reloc_roots function caused by improper resetting of root's reloc_root without barriers, letting attackers cause potential memory corruption or instability, exploit requires kernel-level access."
url: https://panop.io/threat-heartbeat/CVE-2026-93798/
---

# CVE-2026-93798 Linux Kernel - Race Condition

Linux kernel contains a memory barrier issue in btrfs merge\_reloc\_roots function caused by improper resetting of root's reloc\_root without barriers, letting attackers cause potential memory corruption or instability, exploit requires kernel-level access.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.13% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-93798)

## Details

Type

Race Condition

Impact

Denial Of Service, Privilege Escalation

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

24 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for btrfs merge\_reloc\_roots.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-93798](https://nvd.nist.gov/vuln/detail/CVE-2026-93798)
- [https://git.kernel.org/stable/c/29531470b1bf1e8bd2df4941fe913106edbca615](https://git.kernel.org/stable/c/29531470b1bf1e8bd2df4941fe913106edbca615)
- [https://git.kernel.org/stable/c/415f8665a969d3c906e4fd7c90fcbb4b357886f6](https://git.kernel.org/stable/c/415f8665a969d3c906e4fd7c90fcbb4b357886f6)
- [https://git.kernel.org/stable/c/ee695a968aa73b1e67ccbf2133dc0e54381d32b2](https://git.kernel.org/stable/c/ee695a968aa73b1e67ccbf2133dc0e54381d32b2)
- [https://git.kernel.org/stable/c/63d6b1f04cd91c825329712aa526215ffa5d11ca](https://git.kernel.org/stable/c/63d6b1f04cd91c825329712aa526215ffa5d11ca)
- [https://git.kernel.org/stable/c/ab48583aa9948205ff9a6470e23dbff74c565e24](https://git.kernel.org/stable/c/ab48583aa9948205ff9a6470e23dbff74c565e24)
- [https://git.kernel.org/stable/c/b78fe9563e2d5ae47805f1e5dc722c91fd30e1f8](https://git.kernel.org/stable/c/b78fe9563e2d5ae47805f1e5dc722c91fd30e1f8)
- [https://git.kernel.org/stable/c/0bc25f0a2d1b3e0a691431c4d7aef36afcd527c5](https://git.kernel.org/stable/c/0bc25f0a2d1b3e0a691431c4d7aef36afcd527c5)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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