CVE-2023-53631

What it actually does

Reference count leak in kernel attribute handling: kset_find_obj returns a held reference on duplicate detection that is never released via kobject_put, allowing the object to remain pinned indefinitely.

Why it matters to the business

Local processes on affected Linux systems can gradually exhaust kernel memory, leading to denial of service or system instability; high downstream kernel adoption increases exposure across servers, desktops, and embedded devices.

How an attack unfolds

An attacker with local access triggers repeated duplicate attribute lookups in the dell-sysman sysfs interface; each lookup leaks a reference without release, accumulating pinned objects until memory pressure causes crashes or forces resource starvation.

How to fix it

Update to a kernel containing commit d079a3e1ccdd183b75db4f5289be347980b45284 or later; rebuild and deploy the fixed kernel image across all affected systems.

How to confirm the fix worked

Confirm the presence of commit d079a3e1ccdd183b75db4f5289be347980b45284 in the running kernel source or binary; attempt to trigger duplicate attribute paths while monitoring kobject reference counts with kernel debug tooling.

Typical attack path

1. Obtain local user or container access on a system running the vulnerable kernel
2. Interact with dell-sysman sysfs attributes to force kset_find_obj duplicate detection paths
3. Repeat operations to accumulate unreleased references
4. Monitor for memory pressure or trigger OOM conditions to achieve denial of service

How to detect it

Inspect kernel logs for repeated sysfs attribute operations involving dell-sysman; look for unusual growth in kobject or sysfs reference counts via debugfs or slabinfo; correlate with local process activity on affected hardware.

What your security team should do

• Prioritize kernel upgrades on all systems exposing dell-sysman interfaces
• Restrict local access and container workloads until patches are applied
• Monitor memory usage trends on Linux hosts for unexplained growth
• Review downstream distributions for backported fixes