---
title: "CVE-2026-80959: Linux Kernel dm-pcache - Out of Bounds Read"
description: "Linux kernel dm-pcache contains a buffer overflow caused by unchecked segment offset in cache_pos_decode(), letting attackers with CAP_SYS_ADMIN privileges read past segment data, exploit requires CAP_SYS_ADMIN privileges."
url: https://panop.io/threat-heartbeat/CVE-2026-80959/
---

# CVE-2026-80959 Linux Kernel dm-pcache - Out of Bounds Read

Linux kernel dm-pcache contains a buffer overflow caused by unchecked segment offset in cache\_pos\_decode(), letting attackers with CAP\_SYS\_ADMIN privileges read past segment data, exploit requires CAP\_SYS\_ADMIN privileges.

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-2026-80959)

## Details

Type

Out of Bounds Read

Impact

Information Disclosure

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 with dm-pcache patch applied.

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-2026-80959](https://nvd.nist.gov/vuln/detail/CVE-2026-80959)
- [https://git.kernel.org/stable/c/8bf7a06ca3c1611809725f58cfd573f2ffbda75f](https://git.kernel.org/stable/c/8bf7a06ca3c1611809725f58cfd573f2ffbda75f)
- [https://git.kernel.org/stable/c/d1898576090a10d2ac2715218a652e78fb65a6b0](https://git.kernel.org/stable/c/d1898576090a10d2ac2715218a652e78fb65a6b0)
- [https://git.kernel.org/stable/c/ffd9a214a94f9928e54856f42b1cc3e33fb10e36](https://git.kernel.org/stable/c/ffd9a214a94f9928e54856f42b1cc3e33fb10e36)

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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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