CVE-2026-53022

What it actually does

This flaw is a kernel-space buffer overflow in the Linux dell-wmi-sysman platform driver. The vulnerable code builds combined enumeration strings from firmware-provided WMI data into fixed-size 512-byte structure fields. Although each individual source string is bounded, the total concatenated output was not checked before repeated strcat() operations, allowing overly long combined firmware values to write past the destination buffer. If an attacker can influence the firmware/WMI enumeration data consumed by this driver, the result may be kernel memory corruption, system crash, or potentially code execution in kernel context depending on layout and exploitability.

Why it matters to the business

The primary operational risk is instability or compromise of Linux systems that load the Dell WMI system-management driver on affected hardware. A successful attack could crash endpoints or servers, interfere with fleet management, or in a worst case allow elevated control of the operating system. Current public risk appears low because the issue is not in CISA KEV, has no known mature public exploit, and has a low EPSS score, but kernel memory-corruption bugs should still be remediated through normal kernel update cycles because successful exploitation has high impact.

How an attack unfolds

An attacker would need a way to cause the Dell WMI system-management driver to process malicious enumeration data whose combined value-modifier and possible-value strings exceed the fixed 512-byte buffers used by the kernel structure. This is most plausible through control of or tampering with firmware/WMI-provided data, a malicious firmware state, or another privileged path that can influence the firmware interface exposed to the driver. When the driver enumerates firmware attributes and aggregates the strings, the vulnerable code appends each string and separator without checking the remaining destination size. The overflow corrupts adjacent kernel memory. Depending on the overwritten data and system hardening, this could trigger an immediate kernel oops/panic or be shaped into a more controlled kernel memory-corruption primitive.

How to fix it

Update to a Linux kernel build that contains the dell-wmi-sysman fix for bounded enumeration string aggregation. The corrected implementation uses bounded append logic and rejects enumeration packages whose combined strings do not fit in the destination buffers. Where immediate patching is not possible, reduce exposure by unloading or blacklisting the dell-wmi-sysman module if Dell firmware attribute management is not required, limiting local administrative access, enforcing Secure Boot and firmware integrity protections, and monitoring for unexpected kernel crashes involving the driver. Because no exact fixed package versions were provided, use vendor kernel advisories for the relevant distribution and hardware platform to identify the first patched kernel release.

How to confirm the fix worked

Confirm that systems are running a vendor kernel version that includes the upstream fix for dell-wmi-sysman bounded enumeration string aggregation. Verify whether the module is present or loaded using standard kernel module inventory commands and check for sysfs exposure under Dell firmware-attribute paths. On patched systems, enumeration packages whose combined strings exceed the destination size should be rejected rather than causing memory corruption. Review kernel package changelogs or source patches for changes replacing unbounded strcat-style aggregation in populate_enum_data() with bounded append handling.

Typical attack path

1. Identify a Linux system running on affected Dell hardware with the dell-wmi-sysman driver available or loaded.
2. Obtain a path to influence firmware/WMI enumeration data, such as firmware tampering, malicious firmware configuration, or another high-privilege local foothold that can affect the data returned to the driver.
3. Craft enumeration values whose individual strings are acceptable but whose combined concatenated length exceeds the fixed destination buffer.
4. Trigger firmware attribute enumeration through driver initialization, sysfs exposure, or management tooling that causes the vulnerable aggregation routine to run.
5. Cause kernel memory corruption when the driver appends strings beyond the 512-byte destination buffer.
6. Use the corruption to crash the system or, if exploit conditions permit, attempt escalation to kernel-level execution.

How to detect it

To assess whether this was already exploited, review kernel logs, persistent journal data, crash dumps, and endpoint telemetry for memory-corruption symptoms involving the dell-wmi-sysman driver or Dell firmware attribute enumeration. Useful log sources include dmesg output, /var/log/kern.log, /var/log/messages, systemd-journald kernel entries, kdump/vmcore artifacts, kernel oops reports, and EDR records of kernel panic or module-load events. Look for crashes occurring when the dell-wmi-sysman module loads, when firmware attributes are enumerated, or when tools access Dell firmware attribute sysfs paths. There are no known public attacker infrastructure indicators for this issue; detection should focus on local artifacts such as repeated kernel faults, KASAN/KFENCE reports, stack traces containing populate_enum_data or dell-wmi-sysman, and unexpected firmware or BIOS-management activity preceding a crash.

• dell-wmi-sysman
• populate_enum_data
• /sys/class/firmware-attributes/dell-wmi-sysman
• /sys/devices/platform/dell-wmi-sysman
• KASAN: slab-out-of-bounds
• KASAN: global-out-of-bounds
• KASAN: stack-out-of-bounds
• kernel BUG
• Oops:
• general protection fault
• BUG: unable to handle page fault
• dell-wmi-sysman:
• firmware-attributes

What your security team should do

• Prioritize kernel updates for Linux systems on Dell hardware where dell-wmi-sysman is loaded or Dell firmware attributes are exposed.
• Inventory systems for the presence of the dell-wmi-sysman module and Dell firmware attribute sysfs interfaces.
• If patching is delayed and the functionality is not business-critical, blacklist or unload the dell-wmi-sysman module as a temporary mitigation.
• Monitor kernel logs for crashes, oopses, KASAN reports, or general protection faults mentioning dell-wmi-sysman or firmware attribute enumeration.
• Maintain firmware integrity controls, including Secure Boot, trusted firmware update processes, and restrictions on who can change platform firmware settings.
• Treat unexpected kernel crashes on affected Dell Linux systems as potentially security-relevant until ruled out, even though public exploitation is not currently known.