Description
A flaw was found in 389 Directory Server. During schema reload, the attr_syntax_swap_ht() function unconditionally frees attribute syntax information nodes, bypassing the refcount-based deferred deletion used elsewhere in the attribute syntax subsystem. If an administrator triggers schema reload while concurrent LDAP query traffic is active, worker threads may access freed memory, resulting in use-after-free or double-free and a denial of service (server crash).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Directory Server 11 | — | — |
| Red Hat | Red Hat Directory Server 12 | — | — |
| Red Hat | Red Hat Directory Server 13 | — | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | 389-ds-base | No fix yet | — |
| Debian 12 | 389-ds-base | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | 389-ds-base | No fix yet | — |
| Ubuntu 26.04 LTS | 389-ds-base | No fix yet | — |
| Ubuntu 25.10 | 389-ds-base | No fix yet | — |
| Ubuntu 24.04 LTS | 389-ds-base | No fix yet | — |
| Ubuntu 22.04 LTS | 389-ds-base | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | 389-ds-base | No fix yet | — |
| Ubuntu Pro 18.04 LTS | 389-ds-base | No fix yet | — |
| Ubuntu Pro 16.04 LTS | 389-ds-base | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | 389-ds | 2.7.0~git212.9b0755edb-150700.3.19.1 | SUSE-SU-2026:3678-1, SUSE-SU-2026:3138-1 |
| SLES 15 SP6 | 389-ds | 2.2.10~git255.752643c78-150600.8.32.1 | SUSE-SU-2026:3136-1 |
| SLES 15 SP5 | 389-ds | 2.2.10~git255.752643c78-150500.3.48.1 | SUSE-SU-2026:3137-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | 389-ds | 3.0.6~git382.7a51ea5f5-160000.1.1 | SUSE-SU-2026:23574-1 |
| SLES for SAP 15 SP6 | 389-ds | 2.2.10~git255.752643c78-150600.8.32.1 | SUSE-SU-2026:3136-1 |
| SLES for SAP 15 SP5 | 389-ds | 2.2.10~git255.752643c78-150500.3.48.1 | SUSE-SU-2026:3137-1 |
| SLES 16.0 | 389-ds | 3.0.6~git382.7a51ea5f5-160000.1.1 | SUSE-SU-2026:23574-1 |
| SLE HPC 15 SP5 | 389-ds | 2.2.10~git255.752643c78-150500.3.48.1 | SUSE-SU-2026:3137-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | 389-ds | 3.2.2+4b41542b2-1.1 | openSUSE-SU-2026:11600-1 |
| openSUSE Leap 16.0 | 389-ds | 3.0.6~git382.7a51ea5f5-160000.1.1 | openSUSE-SU-2026:21691-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | 389-ds-base | No fix yet | — |
Advisories 7
- SUSE-SU-2026:23574-1 Security update for 389-ds SUSE / openSUSE Security Updates · Sep 29, 2026
- openSUSE-SU-2026:21691-1 Security update for 389-ds SUSE / openSUSE Security Updates · Aug 31, 2026
- openSUSE-SU-2026:11600-1 389-ds-3.2.2+4b41542b2-1.1 on GA media SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:3678-1 Security update for 389-ds SUSE / openSUSE Security Updates · Aug 22, 2026
- SUSE-SU-2026:3138-1 Security update for 389-ds SUSE / openSUSE Security Updates · Jul 21, 2026
- SUSE-SU-2026:3136-1 Security update for 389-ds SUSE / openSUSE Security Updates · Jul 21, 2026
- SUSE-SU-2026:3137-1 Security update for 389-ds SUSE / openSUSE Security Updates · Jul 21, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-11791 vdb-entry
- RHBZ#2485414 issue-tracking