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Linux Distros Unpatched Vulnerability : CVE-2026-11850
medium Nessus Plugin ID 321101
Synopsis
The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.Description
The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.- An integer underflow vulnerability was found in MIT krb5 in the berval2tl_data() function in plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c. The function performs an unsigned subtraction (bv_len - 2) without a prior bounds check. When bv_len is 0 or 1, the subtraction wraps to a large value which is then truncated to uint16_t, yielding 0xFFFE (65534) or 0xFFFF (65535). The subsequent malloc succeeds and memcpy reads up to 65534 bytes from a 0-1 byte buffer, resulting in a heap out-of-bounds read. The attack vector involves a malicious or compromised LDAP KDB backend returning a krbExtraData attribute with bv_len < 2, triggering the underflow when the KDC or kadmind reads principal data. (CVE-2026-11850)
Note that Nessus relies on the presence of the package as reported by the vendor.
Solution
There is no known solution at this time.See Also
https://access.redhat.com/security/cve/cve-2026-11850
Plugin Details
Severity: Medium
ID: 321101
File Name: unpatched_CVE_2026_11850.nasl
Version: 1.1
Type: Local
Agent: unix
Family: Misc.
Published: 6/15/2026
Updated: 6/15/2026
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.7
CVSS v2
Risk Factor: Medium
Base Score: 5.8
Temporal Score: 4.9
Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:P
CVSS Score Source: CVE-2026-11850
CVSS v3
Risk Factor: Medium
Base Score: 5
Temporal Score: 4.6
Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C
Vulnerability Information
CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:centos:centos:libkadm5, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:redhat:enterprise_linux:krb5-xrealmauthz, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:centos:centos:krb5, p-cpe:/a:centos:centos:krb5-pkinit-openssl, p-cpe:/a:redhat:enterprise_linux:krb5-pkinit, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:krb5-workstation, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:redhat:enterprise_linux:krb5-devel, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:redhat:enterprise_linux:9, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:centos:centos:krb5-libs, p-cpe:/a:redhat:enterprise_linux:krb5, p-cpe:/a:redhat:enterprise_linux:krb5-pkinit-openssl, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:krb5-server, cpe:/o:redhat:enterprise_linux:8, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:centos:centos:krb5-server-ldap, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:centos:centos:krb5-xrealmauthz, p-cpe:/a:redhat:enterprise_linux:krb5-libs, cpe:/o:centos:centos:7, p-cpe:/a:centos:centos:krb5-workstation, p-cpe:/a:redhat:enterprise_linux:libkadm5, p-cpe:/a:redhat:enterprise_linux:krb5-server-ldap, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:canonical:ubuntu_linux:krb5, p-cpe:/a:debian:debian_linux:krb5, p-cpe:/a:centos:centos:krb5-devel, p-cpe:/a:centos:centos:krb5-pkinit, p-cpe:/a:redhat:enterprise_linux:krb5-server, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:debian:debian_linux:14.0
Required KB Items: Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched, Host/OS/identifier
Exploit Ease: No known exploits are available
Vulnerability Publication Date: 6/11/2026
Reference Information
CVE: CVE-2026-11850