Linux Distros Unpatched Vulnerability : CVE-2026-121994

high Nessus Plugin ID 376650

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.

- A stack buffer overflow in the GDB client's remote protocol handler allows an attacker-controlled debug target to execute arbitrary code in the GDB process. The vulnerability exists in fetch_register_using_p, which decodes a stub's register reply into an alloca-sized buffer without bounding writes by the register width. (CVE-2026-121994)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

Plugin Details

Severity: High

ID: 376650

File Name: unpatched_CVE_2026_121994.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Misc.

Published: 11/5/2026

Updated: 11/5/2026

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.51

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2026-121994

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 8.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/a:redhat:enterprise_linux:10, cpe:/a:redhat:enterprise_linux:8, cpe:/a:redhat:enterprise_linux:9, cpe:/o:centos:centos:8, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:centos:centos:gcc-toolset-14-gdb, p-cpe:/a:centos:centos:gcc-toolset-15-gdb, p-cpe:/a:centos:centos:gdb-doc, p-cpe:/a:centos:centos:gdb-gdbserver, p-cpe:/a:centos:centos:gdb-headless, p-cpe:/a:centos:centos:gdb-minimal, p-cpe:/a:centos:centos:gdb, p-cpe:/a:redhat:enterprise_linux:gcc-toolset-14-gdb, p-cpe:/a:redhat:enterprise_linux:gcc-toolset-15-gdb, p-cpe:/a:redhat:enterprise_linux:gdb-doc, p-cpe:/a:redhat:enterprise_linux:gdb-gdbserver, p-cpe:/a:redhat:enterprise_linux:gdb-headless, p-cpe:/a:redhat:enterprise_linux:gdb-minimal, p-cpe:/a:redhat:enterprise_linux:gdb

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: 11/5/2026

Reference Information

CVE: CVE-2026-121994

Detections

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