CVE-2026-80048 Sssd: sssd-kcm: local denial of service via excessive memory preallocation
A local attacker can cause a denial of service in sssd-kcm by triggering excessive memory preallocation through a stalled connection.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-80048?
CVE-2026-80048 is a medium-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 6 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was found in `sssd-kcm`. A local user or process able to connect to the `sssd-kcm` UNIX socket can exploit this vulnerability. By sending a large request length header and then stalling the connection, an attacker can cause the system to preallocate significant memory. This leads to memory exhaustion within the `sssd-kcm` responder, resulting in a Denial of Service (DoS) for affected deployments.
Weakness: CWE-770
Which versions are affected by CVE-2026-80048?
How do I fix CVE-2026-80048?
No fix has been published for CVE-2026-80048 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-80048 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-80048 exists.
Sources
Also known as DEBIAN-CVE-2026-80048, GHSA-m2fx-2vhw-gg64, UBUNTU-CVE-2026-80048.