CVE-2026-81474: Dell OpenManage Buffer Overflow Vulnerability

CVE-2026-81474 Overview

CVE-2026-81474 is a heap-based buffer overflow vulnerability [CWE-122] in Dell OpenManage Server Administrator (OMSA) versions prior to 11.1.0.3. A low-privileged local attacker can exploit the flaw to corrupt heap memory and elevate privileges on the affected host. Dell disclosed the issue in security advisory DSA-2026-403 alongside related OMSA network access vulnerabilities. Because OMSA runs with elevated service privileges on Dell PowerEdge servers, successful exploitation grants the attacker high-integrity control of the underlying operating system.

Critical Impact
Local privilege escalation from a low-privileged account to full system control on hosts running Dell OpenManage Server Administrator.

Affected Products

Dell OpenManage Server Administrator (OMSA) versions prior to 11.1.0.3
Dell PowerEdge servers with vulnerable OMSA agent installed
Windows and Linux management stacks that deploy the affected OMSA build

Discovery Timeline

2026-09-17 - CVE-2026-81474 published to the National Vulnerability Database
2026-09-17 - Last updated in NVD database
2026-09-17 - Dell publishes security advisory DSA-2026-403

Technical Details for CVE-2026-81474

Vulnerability Analysis

The vulnerability is a heap-based buffer overflow inside Dell OpenManage Server Administrator, a systems management agent used to monitor and configure Dell PowerEdge hardware. An authenticated local attacker with low privileges can trigger the overflow by supplying malformed input to a vulnerable OMSA component. The overflow corrupts adjacent heap structures, which the attacker can leverage to redirect execution flow within the OMSA service context. Because OMSA runs with elevated privileges to manage hardware and firmware, gaining code execution inside the service produces immediate privilege elevation. Dell's advisory DSA-2026-403 confirms the confidentiality, integrity, and availability of the host are all at risk.

Root Cause

The root cause is improper bounds checking on data written to a heap-allocated buffer inside OMSA. When the affected code path receives attacker-controlled input, it writes past the allocated buffer boundary, overwriting adjacent metadata or object pointers on the heap. Refer to the Dell Security Advisory DSA-2026-403 for component-level details.

Attack Vector

Exploitation requires local access and a low-privileged account on the target system. The attacker interacts with an OMSA interface exposed to local users, such as a local IPC channel, management binary, or on-host service endpoint. No user interaction is required beyond the attacker's own actions. The result is elevation of privileges to the account under which OMSA operates, typically SYSTEM on Windows or root on Linux.

No public proof-of-concept exploit is available at the time of publication. See the vendor advisory for technical details.

Detection Methods for CVE-2026-81474

Indicators of Compromise

Unexpected crashes, restarts, or Watchdog events tied to OMSA services such as dsm_sa_datamgrd, dsm_sa_eventmgr, or omsad
New privileged processes spawned as child processes of OMSA service binaries
Modifications to OMSA installation directories or configuration files by non-administrative users

Detection Strategies

Inventory endpoints for installed OMSA versions and flag any build older than 11.1.0.3
Alert on process lineage where OMSA service processes spawn shells, scripting hosts, or reconnaissance utilities
Correlate local logon events from low-privileged accounts with subsequent SYSTEM- or root-level process creation on hosts running OMSA

Monitoring Recommendations

Enable process creation and command-line auditing on all Dell PowerEdge hosts running OMSA
Forward OMSA application logs and Windows or Linux service crash telemetry to a centralized analytics platform for correlation
Track integrity of OMSA binaries and configuration files with file integrity monitoring

How to Mitigate CVE-2026-81474

Immediate Actions Required

Upgrade Dell OpenManage Server Administrator to version 11.1.0.3 or later on every affected host
Restrict interactive and remote local logon rights on servers running OMSA to trusted administrators only
Audit local accounts on PowerEdge hosts and remove unused or over-privileged users

Patch Information

Dell has released a fixed OMSA build in 11.1.0.3 that remediates the heap-based buffer overflow. Download and deployment instructions are available in the Dell Security Advisory DSA-2026-403. Apply the update during the next available maintenance window and validate service health post-upgrade.

Workarounds

If patching must be delayed, stop and disable the OMSA services on affected hosts until the upgrade can be performed
Limit local access to Dell PowerEdge management hosts using host-based firewalls and jump-server workflows
Enforce least privilege on all accounts capable of interacting with OMSA components

bash

# Verify installed OMSA version on Linux
rpm -qa | grep -i srvadmin

# Stop OMSA services if immediate patching is not possible
sudo /opt/dell/srvadmin/sbin/srvadmin-services.sh stop
sudo /opt/dell/srvadmin/sbin/srvadmin-services.sh disable