CVE-2026-127030: Red Hat Enterprise Linux 10 · Out-of-bounds Write
Affects Red Hat Enterprise Linux 10Source CVE Database V5
Not known to be exploited · CVSS 7.5 High.
Data as of 12 Nov 2026, 16:34 UTC
Thin evidence
One scorer or none| CNA (redhat) | CVSS 3.1 | 7.5 |
|---|
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitation evidence
Disclosed: evidence found.
CVE published 12 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10freeradius | Affected– | Fixed in– |
| Red Hat Enterprise Linux 6freeradius | Affected– | Fixed in– |
| Red Hat Enterprise Linux 7freeradius | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8freeradius:3.0/freeradius | Affected– | Fixed in– |
| Red Hat Enterprise Linux 9freeradius | Affected– | Fixed in– |
AI-suggested
Red Hat advises disabling the EAP-FAST submodule in the FreeRADIUS configuration if it is not required. This can be done by commenting out the 'fast' section in the EAP configuration files and ensuring 'default_eap_type' is not set to 'fast', followed by restarting the radiusd service. Alternatively, restrict incoming RADIUS traffic (UDP port 1812) to trusted network access points using firewall rules. Disabling EAP-FAST will prevent authentication for clients relying exclusively on it.
Description
CVE-2026-127030 is a stack-based buffer overflow vulnerability in the EAP-FAST module of FreeRADIUS on Red Hat Enterprise Linux 10. It arises from improper length validation during session ticket processing. A remote, unauthenticated attacker can exploit this by sending a crafted handshake request, causing the FreeRADIUS server process to crash and resulting in a denial of service. EAP-FAST is not enabled by default, so only systems with this module explicitly enabled are affected.
References
- access.redhat.com/security/cve/CVE-2026-127030 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2572340 (opens in a new tab)
- github.com/FreeRADIUS/freeradius-server/commit/064567a08f3b9d9b4863fab6060fafe296ac7de9 (opens in a new tab)
- github.com/FreeRADIUS/freeradius-server/commit/a5d09dad528d7a3a3c4c01158716ab85a12e09ef (opens in a new tab)