Description
A flaw was found in freeradius. An improper length validation in the EAP-FAST module allows a stack-based buffer overflow during session ticket processing. A remote, unauthenticated attacker can exploit this flaw by sending a specially crafted handshake request, causing the server process to crash and resulting in a Denial of Service (DoS).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | freeradius | No fix yet | — |
| Ubuntu 26.04 LTS | freeradius | No fix yet | — |
| Ubuntu 24.04 LTS | freeradius | No fix yet | — |
| Ubuntu 22.04 LTS | freeradius | No fix yet | — |
| Ubuntu 20.04 LTS | freeradius | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | freeradius | No fix yet | — |
| Ubuntu Pro 16.04 LTS | freeradius | No fix yet | — |
Advisories 1
- WID-SEC-2026-4570 FreeRADIUS: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Nov 12, 2026