CVE-2026-104037
Description
A flaw was found in SSSD. A local attacker can exploit this issue by sending a specially crafted request with an invalid packet length to the autofs responder UNIX socket. This causes an integer underflow and an out-of-bounds memory read, which can crash the responder process and result in a denial of service (DoS).
Statement
This vulnerability is rated as Moderate because exploitation is limited to a local denial of service against the SSSD autofs responder daemon, without enabling privilege escalation or data confidentiality/integrity loss. The autofs responder is only exposed if enabled in the SSSD configuration and accessible through its local UNIX socket. Systems where SSSD does not manage automount maps or where the autofs responder is inactive are unaffected by this issue.
Mitigation
If SSSD automount map integration is not required, disable the autofs responder. Stop and mask the socket-activated service:
# systemctl stop sssd-autofs.socket sssd-autofs.service
# systemctl mask sssd-autofs.socket
If 'autofs' is explicitly listed in the services directive under the [sssd] section of /etc/sssd/sssd.conf, remove it and restart the SSSD service:
# systemctl restart sssd
If autofs support is required, restrict access to the autofs responder UNIX socket (typically /var/lib/sss/pipes/autofs) to trusted local users. Note that disabling the autofs responder prevents SSSD from resolving automount maps, and restarting SSSD may temporarily disrupt identity lookups and active automount operations.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | N/A | 5.5 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Acknowledgements
This issue was discovered by Found by AISLE in partnership with Red Hat.
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