Description
An infinite loop vulnerability was found in Samba's mdssvc RPC service for Spotlight. When parsing Spotlight mdssvc RPC packets sent by the client, the core unmarshalling function sl_unpack_loop() did not validate a field in the network packet that contains the count of elements in an array-like structure. By passing 0 as the count value, the attacked function will run in an endless loop consuming 100% CPU. This flaw allows an attacker to issue a malformed RPC request, triggering an infinite loop, resulting in a denial of service condition.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 9.2 Extended Update Support | — | — |
| Red Hat | Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Storage 3 | — | — |
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 14 | samba | 2:4.18.5+dfsg-1 | — |
| Debian 13 | samba | 2:4.18.5+dfsg-1 | — |
| Debian 12 | samba | 2:4.17.10+dfsg-0+deb12u1 | DSA-5477-1 |
| Debian 11 | samba | 2:4.13.13+dfsg-1~deb11u6 | DSA-5647-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | samba | 2:4.15.13+dfsg-0ubuntu1.2 | USN-6238-1 |
| Ubuntu 20.04 LTS | samba | 2:4.15.13+dfsg-0ubuntu0.20.04.3 | USN-6238-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | samba | 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm1 | USN-7582-1 |
| Ubuntu Pro 16.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.16.04.34+esm2 | USN-7582-1 |
| Ubuntu Pro 14.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm13 | USN-7582-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | ctdb +33 | 4.18.6-100.el9 | RHSA-2023:6667 |
| RHEL 8 | ctdb +33 | 4.18.6-1.el8 | RHSA-2023:7139 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhev Hypervisor 4 | samba +5 | 4.15.5-15.el8_6 | RHSA-2024:0423 |
| RHEL 9.2 EUS | ctdb +33 | 4.17.5-105.el9_2 | RHSA-2024:4101 |
| RHEL 8.8 EUS | ctdb +33 | 4.17.5-5.el8_8 | RHSA-2024:0580 |
| RHEL 8.6 EUS | ctdb +24 | 4.15.5-15.el8_6 | RHSA-2024:0423 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | ctdb +33 | 4.18.6-100.el9 | ALSA-2023:6667 |
| AlmaLinux 8 | ctdb +33 | 4.18.6-1.el8 | ALSA-2023:7139 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | evolution-mapi | 3.28.3-8.el8 | RLSA-2023:7139 |
| Rocky Linux 8 | openchange | 2.3-32.el8 | RLSA-2023:7139 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | samba | 4.17.9+git.367.dae41ffdd1f-150500.3.5.1 | SUSE-SU-2023:2929-1 |
| SLES 15 SP4 | samba | 4.15.13+git.663.9c654e06cdb-150400.3.28.1 | SUSE-SU-2023:2930-1 |
| SLES 15 SP3 | samba | 4.15.13+git.663.9c654e06cdb-150300.3.57.5 | SUSE-SU-2023:3060-1 |
| SLES 12 SP5 | samba | 4.15.13+git.621.c8ae836ff82-3.85.1 | SUSE-SU-2023:2888-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP3 | samba | 4.15.13+git.663.9c654e06cdb-150300.3.57.5 | SUSE-SU-2023:3060-1 |
| SLES for SAP 12 SP5 | samba | 4.15.13+git.621.c8ae836ff82-3.85.1 | SUSE-SU-2023:2888-1 |
| SLE Real Time 15 SP3 | samba | 4.15.13+git.663.9c654e06cdb-150300.3.57.5 | SUSE-SU-2023:3060-1 |
| SLE Micro 5.4 | samba | 4.15.13+git.663.9c654e06cdb-150400.3.28.1 | SUSE-SU-2023:2930-1 |
| SLE Micro 5.3 | samba | 4.15.13+git.663.9c654e06cdb-150400.3.28.1 | SUSE-SU-2023:2930-1 |
| SLE Micro 5.2 | samba | 4.15.13+git.663.9c654e06cdb-150300.3.57.5 | SUSE-SU-2023:3060-1 |
| SLE HPC 15 SP3 | samba | 4.15.13+git.663.9c654e06cdb-150300.3.57.5 | SUSE-SU-2023:3060-1 |
| SUSE Manager Server 4.2 | samba | 4.15.13+git.663.9c654e06cdb-150300.3.57.5 | SUSE-SU-2023:3060-1 |
| SUSE Manager Proxy 4.2 | samba | 4.15.13+git.663.9c654e06cdb-150300.3.57.5 | SUSE-SU-2023:3060-1 |
| SUSE Enterprise Storage 7.1 | samba | 4.15.13+git.663.9c654e06cdb-150300.3.57.5 | SUSE-SU-2023:3060-1 |
| SUSE Enterprise Storage 7 | samba | 4.13.13+git.643.8caa136952b-150200.3.26.3 | SUSE-SU-2023:3066-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | samba | 4.18.5+git.313.c8e274c7852-1.1 | openSUSE-SU-2024:13071-1 |
| openSUSE Leap 15.5 | samba | 4.17.9+git.367.dae41ffdd1f-150500.3.5.1 | SUSE-SU-2023:2929-1 |
| openSUSE Leap 15.4 | samba | 4.15.13+git.663.9c654e06cdb-150400.3.28.1 | SUSE-SU-2023:2930-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.4 | samba | 4.15.13+git.663.9c654e06cdb-150400.3.28.1 | SUSE-SU-2023:2930-1 |
| openSUSE Leap Micro 5.3 | samba | 4.15.13+git.663.9c654e06cdb-150400.3.28.1 | SUSE-SU-2023:2930-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | samba +31 | 2:4.17.10-0.amzn2023.0.1 | ALAS2023-2023-316 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | samba | No fix yet | — |
| Azure Linux 2 (CBL-Mariner) | samba | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | evolution-mapi +1 | 3.40.1-6.el9 | ELSA-2023-6667 |
| Oracle Linux 9 | openchange | 2.3-41.el9 | ELSA-2023-6667 |
| Oracle Linux 9 | samba +32 | 4.18.6-100.el9 | ELSA-2023-6667 |
| Oracle Linux 8 | evolution-mapi +1 | 3.28.3-8.el8 | ELSA-2023-7139 |
| Oracle Linux 8 | openchange | 2.3-32.0.1.el8 | ELSA-2023-7139 |
Advisories 22
- ALSA-2023:6667 Moderate: samba security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:7139 Moderate: samba security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:0423 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2024:0580 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2024:4101 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2023:6667 Red Hat Security Advisory: samba security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2023:7139 Red Hat Security Advisory: samba security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- WID-SEC-2023-1842 Samba: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 25, 2026
- USN-7582-1 samba vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- RLSA-2023:7139 Moderate: samba security, bug fix, and enhancement update Rocky Linux Security Advisories · Jun 25, 2026
- USN-6238-1 samba vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5477-1 samba - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5647-1 samba - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2023:3066-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2888-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13071-1 ctdb-4.18.5+git.313.c8e274c7852-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2929-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3060-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2930-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2023-7139 Moderate: samba security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 18, 2023
- ELSA-2023-6667 Moderate: samba security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 11, 2023
- ALAS2023-2023-316 Important: samba security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 23, 2023
References
- RHSA-2023:6667 vendor-advisory
- RHSA-2023:7139 vendor-advisory
- RHSA-2024:0423 vendor-advisory
- RHSA-2024:0580 vendor-advisory
- RHSA-2024:4101 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2023-34966 vdb-entry
- RHBZ#2222793 issue-tracking
- https://www.samba.org/samba/security/CVE-2023-34966