Vulnerability · Published Apr 15, 2026 · Assigned by redhat
CVE-2026-6245Sssd: out-of-bounds read in the sssd
Medium 5.5
In plain English
A medium-severity security flaw 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 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
A flaw was found in the System Security Services Daemon (SSSD). The pam_passkey_child_read_data() function within the PAM passkey responder fails to properly handle raw bytes received from a pipe. Because the data is treated as a NUL-terminated C string without explicit termination, it results in an out-of-bounds read when processed by functions like snprintf(). A local attacker could potentially trigger this vulnerability by initiating a crafted passkey authentication request, causing the SSSD PAM responder to crash, resulting in a local Denial of Service (DoS).
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | sssd | no fix listed | DEBIAN-CVE-2026-6245 |
| Ubuntu:24.04:LTS | sssd | 2.9.4-1.1ubuntu6.5 | USN-8355-1 |
| Ubuntu:24.04:LTS | sssd | 2.9.4-1.1ubuntu6.5 | UBUNTU-CVE-2026-6245 |
| Ubuntu:25.10 | sssd | 2.10.1-2ubuntu5.2 | UBUNTU-CVE-2026-6245 |
| Ubuntu:25.10 | sssd | 2.10.1-2ubuntu5.2 | USN-8355-1 |
| Ubuntu:26.04:LTS | sssd | 2.12.0-1ubuntu5.1 | USN-8355-1 |
| Ubuntu:26.04:LTS | sssd | 2.12.0-1ubuntu5.1 | UBUNTU-CVE-2026-6245 |
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 |
Weakness: CWE-805 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
- https://access.redhat.com/security/cve/CVE-2026-6245 vdb-entry, x_refsource_REDHAT
- RHBZ#2457954 issue-tracking, x_refsource_REDHAT