---
title: "CVE-2026-90110: Linux Kernel - Side Channel"
description: "Linux kernel inetpeer contains a side-channel vulnerability caused by deterministic RB-tree node comparison in inetpeer rate limiting, letting off-path attackers bypass IP-keyed ICMP rate limits by forcing eviction and reset of rate tokens, exploit requires network access to send packets."
url: https://panop.io/threat-heartbeat/CVE-2026-90110/
---

# CVE-2026-90110 Linux Kernel - Side Channel

Linux kernel inetpeer contains a side-channel vulnerability caused by deterministic RB-tree node comparison in inetpeer rate limiting, letting off-path attackers bypass IP-keyed ICMP rate limits by forcing eviction and reset of rate tokens, exploit requires network access to send packets.

CVSS base score 9.4 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.61% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90110)

## Details

Type

Side Channel

Impact

Information Disclosure

CVSS vector

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

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the inetpeer RB-tree node comparison randomization fix.

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-2026-90110](https://nvd.nist.gov/vuln/detail/CVE-2026-90110)
- [https://git.kernel.org/stable/c/857681f6835d5b0a7bc4a34a026baeaaf5215623](https://git.kernel.org/stable/c/857681f6835d5b0a7bc4a34a026baeaaf5215623)
- [https://git.kernel.org/stable/c/b20e98f0bb668a59abaf7bcf85d75c073e90d352](https://git.kernel.org/stable/c/b20e98f0bb668a59abaf7bcf85d75c073e90d352)
- [https://git.kernel.org/stable/c/199fcf285e498111e029137d088949bc6c26d578](https://git.kernel.org/stable/c/199fcf285e498111e029137d088949bc6c26d578)
- [https://git.kernel.org/stable/c/2ee66e9487172fcd189bc52a767c30dad7141c09](https://git.kernel.org/stable/c/2ee66e9487172fcd189bc52a767c30dad7141c09)
- [https://git.kernel.org/stable/c/5f127e3cc9647a8a70db12c65dbd0de473545380](https://git.kernel.org/stable/c/5f127e3cc9647a8a70db12c65dbd0de473545380)
- [https://git.kernel.org/stable/c/7109bb63667a53e4542ad845476f97d0c8b28a61](https://git.kernel.org/stable/c/7109bb63667a53e4542ad845476f97d0c8b28a61)

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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

Panop answers these inside your environment, for this CVE and every other finding.

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