---
title: "CVE-2026-89723: Linux Kernel - Out of Bounds Read/Write"
description: "Linux kernel contains a slab-out-of-bounds vulnerability in nilfs_direct_propagate caused by improper cleanup of intermediate B-tree node blocks after file truncation, letting attackers trigger out-of-bounds memory access, exploit requires triggering file truncation."
url: https://panop.io/threat-heartbeat/CVE-2026-89723/
---

# CVE-2026-89723 Linux Kernel - Out of Bounds Read/Write

Linux kernel contains a slab-out-of-bounds vulnerability in nilfs\_direct\_propagate caused by improper cleanup of intermediate B-tree node blocks after file truncation, letting attackers trigger out-of-bounds memory access, exploit requires triggering file truncation.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89723)

## Details

Type

Out of Bounds Read/Write

Impact

Denial Of Service

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for nilfs2 slab-out-of-bounds issue.

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-2026-89723](https://nvd.nist.gov/vuln/detail/CVE-2026-89723)
- [https://git.kernel.org/stable/c/39005fd1ce654ffdecacddc406b9a038efe606e6](https://git.kernel.org/stable/c/39005fd1ce654ffdecacddc406b9a038efe606e6)
- [https://git.kernel.org/stable/c/4a1bb1f9f24a935c9b3f4fbf98012fa6d4ad826d](https://git.kernel.org/stable/c/4a1bb1f9f24a935c9b3f4fbf98012fa6d4ad826d)
- [https://git.kernel.org/stable/c/b313edfbc0c2a60f7ce09b2e81ee71909ab8ddaf](https://git.kernel.org/stable/c/b313edfbc0c2a60f7ce09b2e81ee71909ab8ddaf)
- [https://git.kernel.org/stable/c/bf49e6f6ddc12445a0330708b365de6458085980](https://git.kernel.org/stable/c/bf49e6f6ddc12445a0330708b365de6458085980)
- [https://git.kernel.org/stable/c/28362e8ce51377afdec1782e661e808328a10514](https://git.kernel.org/stable/c/28362e8ce51377afdec1782e661e808328a10514)
- [https://git.kernel.org/stable/c/448636c745a3f3b8582a0b8ce718c890a11c0fa9](https://git.kernel.org/stable/c/448636c745a3f3b8582a0b8ce718c890a11c0fa9)
- [https://git.kernel.org/stable/c/45662dedb8f272ef7f16e69f13424c4bd0399240](https://git.kernel.org/stable/c/45662dedb8f272ef7f16e69f13424c4bd0399240)
- [https://git.kernel.org/stable/c/5d3783c451a546373662ee11ec17019273e68034](https://git.kernel.org/stable/c/5d3783c451a546373662ee11ec17019273e68034)

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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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