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
How to mitigate CVE-2026-90110
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/199fcf285e498111e029137d088949bc6c26d578
- https://git.kernel.org/stable/c/2ee66e9487172fcd189bc52a767c30dad7141c09
- https://git.kernel.org/stable/c/5f127e3cc9647a8a70db12c65dbd0de473545380
- https://git.kernel.org/stable/c/7109bb63667a53e4542ad845476f97d0c8b28a61
- https://git.kernel.org/stable/c/857681f6835d5b0a7bc4a34a026baeaaf5215623
- https://git.kernel.org/stable/c/b20e98f0bb668a59abaf7bcf85d75c073e90d352