Vulnerability · Published Oct 6, 2026 · Assigned by redhat
CVE-2026-104036Sssd: sssd: denial of service via out-of-bounds write in nfs idmap plugin
Medium 5.8
In plain English
A medium-severity out-of-bounds write in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 0% of all known vulnerabilities).
Official description
A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | sssd | no fix listed | DEBIAN-CVE-2026-104036 |
| Debian:13 | sssd | no fix listed | DEBIAN-CVE-2026-104036 |
| Ubuntu:22.04:LTS | sssd | no fix listed | UBUNTU-CVE-2026-104036 |
| Ubuntu:24.04:LTS | sssd | no fix listed | UBUNTU-CVE-2026-104036 |
| Ubuntu:26.04:LTS | sssd | no fix listed | UBUNTU-CVE-2026-104036 |
| Ubuntu:26.10 | sssd | no fix listed | UBUNTU-CVE-2026-104036 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| 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 |
| Red Hat | Red Hat OpenShift Container Platform 5 | see references |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
References
- https://access.redhat.com/security/cve/CVE-2026-104036 vdb-entry, x_refsource_REDHAT
- RHBZ#2479057 issue-tracking, x_refsource_REDHAT