CVE-2026-6245
published 2026-04-15CVE-2026-6245: 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…
PriorityP422medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.14%
3.0th percentile
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
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | openshift_container_platform | — | — |
| ubuntu | sssd | — | — |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vendor_redhat5.5MEDIUM
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Red Hat
sssd: sssd: PAM responder out-of-bounds read via unchecked auth_token_length in protocol v1
vendor_redhat·2026-08-03·CVSS 5.5
CVE-2026-68743 [MEDIUM] CWE-125 sssd: sssd: PAM responder out-of-bounds read via unchecked auth_token_length in protocol v1
sssd: sssd: PAM responder out-of-bounds read via unchecked auth_token_length in protocol v1
A flaw was found in SSSD. The extract_authtok_v1() function in the PAM responder does not validate the auth_token_length field against the remaining buffer size before processing. A local attacker can exploit this via a crafted protocol v1 request to the PAM responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.
Statement: This issue can only be triggered by a local attacker who can connect to the SSSD PAM responder unix socket and send crafted protocol v1 requests. The stock PAM client uses protocol v3 and is not affected by this path. On SSSD 2.10 and later, responders run as an unprivileged user; on earlier versions they may run as root. In either c
Ubuntu
SSSD vulnerability
vendor_ubuntu·2026-06-01
CVE-2026-6245 SSSD vulnerability
Title: SSSD vulnerability
Summary: SSSD could be made to crash if it received specially crafted input.
It was discovered that SSSD did not properly handle raw bytes in the PAM
passkey responder. A local attacker could possibly use this issue to cause
the SSSD PAM responder to crash, resulting in a denial of service.
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
sssd: out-of-bounds read in the sssd
vendor_redhat·2026-04-15·CVSS 5.5
CVE-2026-6245 [MEDIUM] CWE-805 sssd: out-of-bounds read in the sssd
sssd: out-of-bounds read in the sssd
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).
Statement: This Moderate impact flaw in the System Security Services Daemon (SSSD) can lead to a local Denial of Service. A local attacker can exploit an out-of-bounds read in the PAM passkey
VulDB
Red Hat Enterprise Linux/OpenShift Container Platform System Security Service Daemon pam_passkey_child_read_data buffer access with incorrect length value
vuldb·2026-04-16·CVSS 5.5
CVE-2026-6245 [MEDIUM] Red Hat Enterprise Linux/OpenShift Container Platform System Security Service Daemon pam_passkey_child_read_data buffer access with incorrect length value
A vulnerability, which was classified as critical, has been found in Red Hat Enterprise Linux and OpenShift Container Platform. Impacted is the function pam_passkey_child_read_data of the component System Security Service Daemon. Performing a manipulation results in buffer access with incorrect length value.
This vulnerability was named CVE-2026-6245. The attack needs to be approached locally. There is no available exploit.
GHSA
GHSA-g672-w7xh-qp9j: A flaw was found in the System Security Services Daemon (SSSD)
ghsa_unreviewed·2026-04-15
CVE-2026-6245 [MEDIUM] CWE-805 GHSA-g672-w7xh-qp9j: A flaw was found in the System Security Services Daemon (SSSD)
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).
No detection rules found.
No public exploits indexed.
2026-04-15
Published