---
title: "CVE-2026-80985: Linux Kernel - Data Tampering & Denial of Service"
description: "Linux kernel contains a vulnerability in net/smc where oversized SMC-Rv2 LLC messages are improperly handled in smc_llc_rmt_delete_rkey() and smc_llc_save_add_link_rkeys(), letting attackers cause unintended rkey deletions and modifications, exploit requires crafted SMC-Rv2 LLC messages on a shared v2 receive buffer link."
url: https://panop.io/threat-heartbeat/CVE-2026-80985/
---

# CVE-2026-80985 Linux Kernel - Data Tampering & Denial of Service

Linux kernel contains a vulnerability in net/smc where oversized SMC-Rv2 LLC messages are improperly handled in smc\_llc\_rmt\_delete\_rkey() and smc\_llc\_save\_add\_link\_rkeys(), letting attackers cause unintended rkey deletions and modifications, exploit requires crafted SMC-Rv2 LLC messages on a shared v2 receive buffer link.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.54% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-80985)

## Details

Type

Data Tampering

Impact

Denial Of Service, Data Tampering

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for net/smc message handling.

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-2026-80985](https://nvd.nist.gov/vuln/detail/CVE-2026-80985)
- [https://git.kernel.org/stable/c/edf30d65e3ac52f886f7d87b1a7449742e79157d](https://git.kernel.org/stable/c/edf30d65e3ac52f886f7d87b1a7449742e79157d)
- [https://git.kernel.org/stable/c/0d6f80be8ac5886842640d6526abf3f9a215be75](https://git.kernel.org/stable/c/0d6f80be8ac5886842640d6526abf3f9a215be75)
- [https://git.kernel.org/stable/c/8d3c1ab82c11d4fadebf817a825fd221b3e197ea](https://git.kernel.org/stable/c/8d3c1ab82c11d4fadebf817a825fd221b3e197ea)

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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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