CVE-2026-68744

Provides a set of daemons to manage access to remote directories and authentication mechanisms. It provides an NSS and PAM interface toward the system and a pluggable back end system to connect to multiple different account sources. It is also the basis to provide client auditing and policy services for projects like FreeIPA.

Security Fix(es):

A flaw was found in SSSD. The sss_nss_protocol_parse_addr() function in the NSS responder does not validate the addrlen field against the remaining packet body size. A local attacker can exploit this via a crafted GETHOSTBYADDR request to the NSS responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.(CVE-2026-68742)

A flaw was found in SSSD. The sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates reply space for all group entries but does not shrink the packet when groups are skipped, causing uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose cached directory data and heap layout information from the sssd_nss process.(CVE-2026-68744)

Provides a set of daemons to manage access to remote directories and authentication mechanisms. It provides an NSS and PAM interface toward the system and a pluggable back end system to connect to multiple different account sources. It is also the basis to provide client auditing and policy services for projects like FreeIPA.

Security Fix(es):

A flaw was found in SSSD. The sss_nss_protocol_parse_addr() function in the NSS responder does not validate the addrlen field against the remaining packet body size. A local attacker can exploit this via a crafted GETHOSTBYADDR request to the NSS responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.(CVE-2026-68742)

A flaw was found in SSSD. The sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates reply space for all group entries but does not shrink the packet when groups are skipped, causing uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose cached directory data and heap layout information from the sssd_nss process.(CVE-2026-68744)

Provides a set of daemons to manage access to remote directories and authentication mechanisms. It provides an NSS and PAM interface toward the system and a pluggable back end system to connect to multiple different account sources. It is also the basis to provide client auditing and policy services for projects like FreeIPA.

Security Fix(es):

A flaw was found in SSSD. The sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates reply space for all group entries but does not shrink the packet when groups are skipped, causing uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose cached directory data and heap layout information from the sssd_nss process.(CVE-2026-68744)

Provides a set of daemons to manage access to remote directories and authentication mechanisms. It provides an NSS and PAM interface toward the system and a pluggable back end system to connect to multiple different account sources. It is also the basis to provide client auditing and policy services for projects like FreeIPA.

Security Fix(es):

A flaw was found in SSSD. The sss_nss_protocol_parse_addr() function in the NSS responder does not validate the addrlen field against the remaining packet body size. A local attacker can exploit this via a crafted GETHOSTBYADDR request to the NSS responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.(CVE-2026-68742)

A flaw was found in SSSD. The sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates reply space for all group entries but does not shrink the packet when groups are skipped, causing uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose cached directory data and heap layout information from the sssd_nss process.(CVE-2026-68744)

A flaw was found in SSSD. The sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates reply space for all group entries but does not shrink the packet when groups are skipped, causing uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose cached directory data and heap layout information from the sssd_nss process.

• CVE-2026-68744: heap memory disclosure in sss_nss_protocol_fill_initgr() in the NSS responder, which sized the initgroups reply packet for every group in the result but left the slots of skipped groups (non-POSIX, incomplete, or negative-cache filtered) holding unzeroed heap from talloc_realloc_size()

• CVE-2026-68744: heap information disclosure in the NSS responder's sss_nss_protocol_fill_initgr() - the initgroups reply packet is sized for every group in the result set but never shrunk when entries are skipped as non-POSIX, incomplete or negative-cache filtered, so the unwritten tail of the packet leaks uninitialized heap bytes to the client

This update for sssd fixes the following issues:

Security issues fixed:

• CVE-2026-68742: insufficient validation in the NSS responder can lead to an out-of-bounds read and a process crash when a crafted GETHOSTBYADDR request is sent to the NSS responder socket (bsc#1273922).
• CVE-2026-68743: insufficient validation in the PAM responder can lead to an out-of-bounds read and a process crash when a crafted protocol v1 request is processed (bsc#1273925).
• CVE-2026-68744: improper memory management in the NSS responder can lead to uninitialized heap memory disclosure from the sssd_nss process (bsc#1273924).

Other updates and bugfixes:

• Add systemd-tmpfiles configuration file to populate /var/lib/sss with the correct permissions on transactional servers (bsc#1274748).

This update for sssd fixes the following issues:

• CVE-2026-68742: insufficient validation in the NSS responder can lead to an out-of-bounds read and a process crash when a crafted GETHOSTBYADDR request is sent to the NSS responder socket (bsc#1273922).
• CVE-2026-68743: insufficient validation in the PAM responder can lead to an out-of-bounds read and a process crash when a crafted protocol v1 request is processed (bsc#1273925).
• CVE-2026-68744: improper memory management in the NSS responder can lead to uninitialized heap memory disclosure from the sssd_nss process (bsc#1273924).

This update for sssd fixes the following issues:

• CVE-2026-68742: insufficient validation in the NSS responder can lead to an out-of-bounds read and a process crash when a crafted GETHOSTBYADDR request is sent to the NSS responder socket (bsc#1273922).
• CVE-2026-68743: insufficient validation in the PAM responder can lead to an out-of-bounds read and a process crash when a crafted protocol v1 request is processed (bsc#1273925).
• CVE-2026-68744: improper memory management in the NSS responder can lead to uninitialized heap memory disclosure from the sssd_nss process (bsc#1273924).

This update for sssd fixes the following issues:

Security issues fixed:

• CVE-2026-68742: insufficient validation in the NSS responder can lead to an out-of-bounds read and a process crash when a crafted GETHOSTBYADDR request is sent to the NSS responder socket (bsc#1273922).
• CVE-2026-68743: insufficient validation in the PAM responder can lead to an out-of-bounds read and a process crash when a crafted protocol v1 request is processed (bsc#1273925).
• CVE-2026-68744: improper memory management in the NSS responder can lead to uninitialized heap memory disclosure from the sssd_nss process (bsc#1273924).

Other updates and bugfixes:

• Add systemd-tmpfiles configuration file to populate /var/lib/sss with the correct permissions on transactional servers (bsc#1274748).

This update for sssd fixes the following issues:

Security issues fixed:

• CVE-2026-68742: insufficient validation in the NSS responder can lead to an out-of-bounds read and a process crash when a crafted GETHOSTBYADDR request is sent to the NSS responder socket (bsc#1273922).
• CVE-2026-68743: insufficient validation in the PAM responder can lead to an out-of-bounds read and a process crash when a crafted protocol v1 request is processed (bsc#1273925).
• CVE-2026-68744: improper memory management in the NSS responder can lead to uninitialized heap memory disclosure from the sssd_nss process (bsc#1273924).

Other updates and bugfixes:

• Add systemd-tmpfiles configuration file to populate /var/lib/sss with the correct permissions on transactional servers (bsc#1274748).

This update for sssd fixes the following issues:

• CVE-2026-68742: unvalidated address lengths in NSS responder packet parsing can cause a heap out-of-bounds read (bsc#1273922).
• CVE-2026-68743: oversized length parameters in authentication requests can cause heap out-of-bounds reads (bsc#1273925).
• CVE-2026-68744: unshrunk packet allocations during group resolution can allow uninitialized heap memory disclosure (bsc#1273924).

Changes for sssd:

• Warn about ldap_sudo_search_base only if sudo target is enabled; (bsc#1273009)

This update for sssd fixes the following issues:

• CVE-2026-12610: cancelled or completed PAM request while the asynchronous child process is still running can lead to a use-after-free (bsc#1269807).
• CVE-2026-68742: unvalidated address lengths in NSS responder packet parsing can cause a heap out-of-bounds read (bsc#1273922).
• CVE-2026-68743: oversized length parameters in authentication requests can cause heap out-of-bounds reads (bsc#1273925).
• CVE-2026-68744: unshrunk packet allocations during group resolution can allow uninitialized heap memory disclosure (bsc#1273924).
• CVE-2026-90462: Fail-open in LDAP ppolicy access check allows continued authorization (bsc#1282584).
• CVE-2026-90463: out-of-bounds read in the NSS service request parsers (bsc#1280360).
• CVE-2026-90994: out-of-bounds read in PAM v1 parser (bsc#1280361).
• CVE-2026-90995: NULL pointer dereference in PAM responder (bsc#1280362).
• CVE-2026-90996: zero-length request body underflow in the NSS responder (bsc#1280363).
• CVE-2026-92821: access control bypass due to premature LDAP access rule evaluation (bsc#1284326).
• CVE-2026-104029: denial of service due to out-of-bounds read in autofs responder (bsc#1284314).
• CVE-2026-104031: denial of service via memory exhaustion in autofs responder (bsc#1284316).
• CVE-2026-104033: access control bypass due to improper LDAP shadow expiration check (bsc#1284318).
• CVE-2026-104036: denial of service due to out-of-bounds write in NFS idmap plugin (bsc#1284321).
• CVE-2026-104037: denial of service due to packet length underflow in autofs responder (bsc#1284322).
• CVE-2026-104038: denial of service via missing SID extension in certificate mapping (bsc#1284323).
• CVE-2026-104039: denial of service due to stale connection state reuse in PAM GSSAPI responder (bsc#1284324).
• CVE-2026-104043: Denial of Service via undersized packet parsing in NSS responder (bsc#1284266).
• CVE-2026-104045: denial of service via race condition in autofs responder (bsc#1284470).