In the Linux kernel, the following vulnerability has been resolved: sctp: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.
Conclusion & alert: CVE-2025-40204 is rated Low Risk (18.2/100): low exploitation likelihood (EPSS 0.06%). Mandatory action: Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-04-22 | 0.04% | 0.06% | +0.01% |
| 2 | 2026-04-10 | 0.06% | 0.04% | -0.02% |
| 3 | 2025-12-18 | — | 0.06% | — |
Full EPSS history (4 records total)
CVSS metrics for this CVE.
No CVSS data in dataset for this CVE.
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2025-40204 not yet assigned priority: Debian including 2 source packages (linux, linux-6.1), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6. | https://security-tracker.debian.org/tracker/CVE-2025-40204 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2025-40204 |
suse
|
high | CVE-2025-40204 severity important: SUSE including 677 source package names (13.2-9.1:libgcrypt20-1.10.3-slfo.1.1_2.1, 13.2-9.1:libip4tc2-1.8.9-4.1, …), 1757 product×package rows across 318 product lines (Container suse/sl-micro/6.0/baremetal-os-container, Container suse/sl-micro/6.0/base-os-container, … (318 product lines)): Fixed 1503, Known Affected 231, First Fixed 23. | https://www.suse.com/security/cve/CVE-2025-40204/ |
ubuntu
|
medium | CVE-2025-40204 medium priority: Ubuntu including 157 source packages (linux, linux-allwinner-5.19, …), 1405 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): DNE 1010, ignored 181, released 158, needed 49, not-affected 4, pending 3. | https://ubuntu.com/security/CVE-2025-40204 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| No affected products in dataset. | |||