# CVE-2026-104037: Sssd: sssd: denial of service via packet length underflow in autofs responder

Status: published. Published: 2026-10-06. Updated: 2026-11-05.

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).

## Remediation

- workaround: 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. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (sssd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (sssd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (sssd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (sssd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (sssd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-8): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 5 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat

- CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.14% as of 2026-11-05; percentile 3.13%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-125

## Exploit evidence

- exploit: https://bugzilla.redhat.com/show_bug.cgi?id=2479030 (ADP: CISA-ADP)

## References

- https://access.redhat.com/security/cve/CVE-2026-104037 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2479030 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2479030 (ADP: CISA-ADP; exploit)

- https://access.redhat.com/security/cve/CVE-2026-104037 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2479030 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2479030 (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-104037; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104037; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-104037; retrieved 2026-11-05; source updated Not reported

Revision: d59aa4b4892b19a777369b74328d4d39b9d2c8247c0c8dca69ffbe80ab2f905c

Canonical: https://y2.dev/cve/CVE-2026-104037

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