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VulnerabilityPublished

CVE-2026-127030: Red Hat Enterprise Linux 10 · Out-of-bounds Write

Affects Red Hat Enterprise Linux 10Source CVE Database V5

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Not known to be exploited · CVSS 7.5 High.

Data as of 12 Nov 2026, 16:34 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.17.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
Red Hat Enterprise Linux 10freeradiusAffected–Fixed in–
Red Hat Enterprise Linux 6freeradiusAffected–Fixed in–
Red Hat Enterprise Linux 7freeradiusAffected–Fixed in–
Red Hat Enterprise Linux 8freeradius:3.0/freeradiusAffected–Fixed in–
Red Hat Enterprise Linux 9freeradiusAffected–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

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