Out-of-Bounds Write Vulnerability in SSSD NFS Idmap Plugin of Red Hat Products
CVE-2026-104036

5.8MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
6 October 2026

What is CVE-2026-104036?

A vulnerability has been identified in the NFS idmap plugin of SSSD, where the plugin improperly handles cached user and group names. When the plugin encounters a cached entry that exceeds the destination buffer size, it continues to copy data without adequately aborting the operation. This oversight allows a local attacker to engage in identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. The primary consequence of this flaw is a Denial of Service (DoS) scenario, leading to the potential crash of the identity mapping service, along with risks of memory corruption in adjacent processes.

References

https://access.redhat.com/security/cve/CVE-2026-104036
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2479057
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
5.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered by Found by AISLE in partnership with Red Hat.
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