What is RHSA-2025:23427?

RHSA-2025:23427 is a security advisory published by Red Hat Product Security with High severity. Red Hat Security Advisory: kernel security update

Which CVE IDs does RHSA-2025:23427 cover?

RHSA-2025:23427 covers the following CVE IDs: CVE-2025-40186, CVE-2023-53401, CVE-2025-39955. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of RHSA-2025:23427?

RHSA-2025:23427 has a CVSS v3 base score of 7.6, published by Red Hat Product Security.

RHSA-2025:23427HighCVSS 7.6

Red Hat Security Advisory: kernel security update

Vendor

Red Hat Product Security

Published

December 17, 2025

Last Modified

June 29, 2026

🔗 CVE IDs covered (3)

CVE-2025-40186 →CVE-2023-53401 →CVE-2025-39955 →

📋 Description

CVE-2023-53401 — kernel: mm: kmem: fix a NULL pointer dereference in obj_stock_flush_required() CVE-2025-39955 — kernel: tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect() CVE-2025-40186 — kernel: Linux kernel: Privilege escalation or Denial of Service via TCP Fast Open vulnerability

🔗 References (6)

selfhttps://access.redhat.com/errata/RHSA-2025:23427
externalhttps://access.redhat.com/security/updates/classification/#important
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2396417
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2402699
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2414724
selfhttps://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_23427.json