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Vulnerability · Published Oct 6, 2026 · Assigned by redhat

CVE-2026-80048Sssd: sssd-kcm: local denial of service via excessive memory preallocation

Medium 5.5

In plain English

A medium-severity resource allocation without limits in Red Hat Enterprise Linux 10 from Red Hat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 92.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12sssdno fix listedDEBIAN-CVE-2026-80048
Debian:13sssdno fix listedDEBIAN-CVE-2026-80048
Ubuntu:22.04:LTSsssdno fix listedUBUNTU-CVE-2026-80048
Ubuntu:24.04:LTSsssdno fix listedUBUNTU-CVE-2026-80048
Ubuntu:26.04:LTSsssdno fix listedUBUNTU-CVE-2026-80048
Ubuntu:26.10sssdno fix listedUBUNTU-CVE-2026-80048

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references

Weakness: CWE-770 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References