Bug#1143600: sssd: CVE-2026-68742 CVE-2026-68744

Source: sssd
Version: 2.12.0-4
Severity: grave
Tags: security upstream
X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>

Hi,

The following vulnerabilities were published for sssd.

There is litte information available, can you check the upstream
status please and report back? Are they known, are they already fixed?

CVE-2026-68742[0]:
| 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-2026-68744[1]:
| 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.


If you fix the vulnerabilities please also make sure to include the
CVE (Common Vulnerabilities & Exposures) ids in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-68742
    https://www.cve.org/CVERecord?id=CVE-2026-68742
[1] https://security-tracker.debian.org/tracker/CVE-2026-68744
    https://www.cve.org/CVERecord?id=CVE-2026-68744

Regards,
Salvatore