CVE-2026-127029: 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-SIM submodule in the FreeRADIUS configuration if SIM-based authentication is not required by commenting out or removing the 'sim' block in the eap module configuration file (/etc/raddb/mods-available/eap or /etc/raddb/mods-enabled/eap) and restarting the FreeRADIUS service. Additionally, restrict RADIUS UDP traffic on ports 1812 and 1813 to trusted Network Access Server IP addresses using firewall rules to limit exposure. These mitigations reduce the attack surface and prevent exploitation.
Description
CVE-2026-127029 is a vulnerability in the FreeRADIUS EAP-SIM module on Red Hat Enterprise Linux 10. It involves a stack buffer overflow caused by improper length checking of a client-supplied identity during authentication. An unauthenticated remote attacker can exploit this by sending crafted EAP-SIM messages, causing the RADIUS server to crash and resulting in a denial of service. This flaw only affects deployments with the EAP-SIM submodule enabled. Mitigation includes disabling the EAP-SIM submodule if not needed and restricting RADIUS UDP traffic to trusted sources.
References
- access.redhat.com/security/cve/CVE-2026-127029 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2572339 (opens in a new tab)
- github.com/FreeRADIUS/freeradius-server/commit/064567a08f3b9d9b4863fab6060fafe296ac7de9 (opens in a new tab)
- github.com/FreeRADIUS/freeradius-server/commit/e415f818dcdf91626e5e7314b3a4f819ab11f572 (opens in a new tab)