Use of insufficiently random values in Linux kernel - CVE-2026-90110

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Main Vulnerability Database Vulnerabilities #VU151381

Use of insufficiently random values in Linux kernel - CVE-2026-90110

Published: September 19, 2026


Vulnerability identifier: #VU151381
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90110
CWE-ID: CWE-330
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass IP-keyed ICMP rate limits and infer open UDP ports.

The vulnerability exists due to predictable tree ordering in the inetpeer rate limiting system when processing packets from remote IP addresses. A remote attacker can trigger garbage collection and selectively evict inet_peer entries to bypass IP-keyed ICMP rate limits and infer open UDP ports.

Re-created entries have their rate-limiting token buckets reset to full capacity.


Affected software

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

How to mitigate CVE-2026-90110

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.111-1

External References

Related Security Bulletins