Description
A null pointer dereference flaw was found in samba's Winbind service in versions before 4.11.15, before 4.12.9 and before 4.13.1. A local user could use this flaw to crash the winbind service causing denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Samba | All samba versions before 4.11.15, before 4.12.9 and before 4.13.1 | — |
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 | 2:4.13.2+dfsg-2 | — |
| Debian 13 | samba | 2:4.13.2+dfsg-2 | — |
| Debian 12 | samba | 2:4.13.2+dfsg-2 | — |
| Debian 10 | samba | 2:4.9.5+dfsg-5+deb10u5 | DLA-3792-1 |
| Debian 9 | samba | 2:4.5.16+dfsg-1+deb9u3 | DLA-2463-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | samba | 2:4.11.6+dfsg-0ubuntu1.6 | USN-4611-1 |
| Ubuntu 18.04 LTS | samba | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | USN-4611-1 |
| Ubuntu 16.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.16.04.32 | USN-4611-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11 | USN-4931-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | ctdb +24 | 4.13.3-3.el8 | RHSA-2021:1647 |
| RHEL 8 | openchange | 2.3-27.el8 | RHSA-2021:1647 |
| RHEL 7 | ctdb +26 | 4.10.16-9.el7_9 | RHSA-2020:5439 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Gluster Storage 3 | ctdb +20 | 4.11.6-112.el7rhgs | RHSA-2021:3723, RHBA-2021:1503 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | openchange | 2.3-27.el8 | ALSA-2021:1647 |
| AlmaLinux 8 | samba-devel +2 | 4.13.3-3.el8 | ALSA-2021:1647 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | openchange | 2.3-27.el8 | RLSA-2021:1647 |
| Rocky Linux 8 | samba | 4.13.3-3.el8 | RLSA-2021:1647 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | samba | 4.11.14+git.202.344b137b75d-4.14.1 | SUSE-SU-2020:3081-1 |
| SLES 15 SP1 | samba | 4.9.5+git.383.7b7f8f14df8-3.47.1 | SUSE-SU-2020:3092-1 |
| SLES 15 | samba | 4.7.11+git.280.25dfd9a947d-4.51.1 | SUSE-SU-2020:3087-1 |
| SLES 12 SP5 | samba | 4.10.18+git.219.1d732314d96-3.20.1 | SUSE-SU-2020:3082-1 |
| SLES 12 SP4 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
Show 20 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SLES 12 SP2 | samba | 4.4.2-38.39.1 | SUSE-SU-2023:0122-1, SUSE-SU-2020:3083-1 |
| SLES 11 SP4 | samba +1 | 3.6.3-94.31.1 | SUSE-SU-2020:14525-1 |
| SLES 2 | samba | 4.9.5+git.383.7b7f8f14df8-3.47.1 | SUSE-SU-2020:3092-1, SUSE-SU-2020:3081-1 |
| SLES for SAP 15 | samba | 4.7.11+git.280.25dfd9a947d-4.51.1 | SUSE-SU-2020:3087-1 |
| SLES for SAP 12 SP5 | samba | 4.10.18+git.219.1d732314d96-3.20.1 | SUSE-SU-2020:3082-1 |
| SLES for SAP 12 SP4 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SLES for SAP 12 SP3 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SLES for SAP 12 SP2 | samba | 4.4.2-38.39.1 | SUSE-SU-2020:3083-1 |
| SLE HPC 15 | samba | 4.7.11+git.280.25dfd9a947d-4.51.1 | SUSE-SU-2020:3087-1 |
| SUSE OpenStack Cloud Crowbar 9 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SUSE OpenStack Cloud Crowbar 8 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SUSE OpenStack Cloud 9 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SUSE OpenStack Cloud 8 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SUSE OpenStack Cloud 7 | samba | 4.4.2-38.39.1 | SUSE-SU-2020:3083-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | samba +1 | 3.6.3-94.31.1 | SUSE-SU-2020:14525-1 |
| SUSE HPE Helion OpenStack 8 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SUSE Enterprise Storage 7 | samba | 4.13.3+git.181.fc4672a5b81-3.3.1 | SUSE-SU-2021:0185-1 |
| SUSE Enterprise Storage 6 | samba | 4.9.5+git.383.7b7f8f14df8-3.47.1 | SUSE-SU-2020:3092-1 |
| SUSE Enterprise Storage 5 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | samba | 4.14.6+git.182.2205d5224e3-1.1 | openSUSE-SU-2024:11365-1 |
| openSUSE Leap 15.2 | samba | 4.11.14+git.202.344b137b75d-lp152.3.16.1 | openSUSE-SU-2020:1819-1 |
| openSUSE Leap 15.1 | samba | 4.9.5+git.383.7b7f8f14df8-lp151.2.36.1 | openSUSE-SU-2020:1811-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | samba | 4.12.9-r0 | — |
| Alpine v3.23 | samba | 4.12.9-r0 | — |
| Alpine v3.22 | samba | 4.12.9-r0 | — |
| Alpine v3.21 | samba | 4.12.9-r0 | — |
| Alpine v3.20 | samba | 4.12.9-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | samba | 4.12.9-r0 | — |
| Alpine v3.18 | samba | 4.12.9-r0 | — |
| Alpine v3.17 | samba | 4.12.9-r0 | — |
| Alpine v3.16 | samba | 4.12.9-r0 | — |
| Alpine v3.15 | samba | 4.12.9-r0 | — |
| Alpine v3.14 | samba | 4.12.9-r0 | — |
| Alpine v3.13 | samba | 4.12.9-r0 | — |
| Alpine v3.12 | samba | 4.12.9-r0 | — |
| Alpine v3.11 | samba | 4.11.16-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | ctdb +26 | 4.10.16-9.amzn2.0.1 | ALAS2-2021-1585 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | samba | 4.18.3-1 | — |
| Azure Linux 2 (CBL-Mariner) | samba | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | ctdb +24 | 4.13.3-3.el8 | ELSA-2021-1647 |
| Oracle Linux 8 | openchange | 2.3-27.0.1.el8 | ELSA-2021-1647 |
| Oracle Linux 7 | ctdb +26 | 4.10.16-9.el7_9 | ELSA-2020-5439 |
Advisories 26
- ALSA-2021:1647 Moderate: samba security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- USN-4931-1 samba vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- RHSA-2021:1647 Red Hat Security Advisory: samba security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2020:5439 Red Hat Security Advisory: samba security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4611-1 samba vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-3792-1 samba - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2463-1 samba - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RHSA-2021:3723 Red Hat Security Advisory: samba security, bug fix and enhancement update Red Hat Security Advisories (RHSA) · Feb 24, 2026
- RHBA-2021:1503 Red Hat Bug Fix Advisory: samba bug fix update Red Hat Security Advisories (RHSA) · Feb 24, 2026
- RLSA-2021:1647 Moderate: samba security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:11365-1 ctdb-4.14.6+git.182.2205d5224e3-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3083-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3092-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:14525-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3087-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1819-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3093-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1811-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0185-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3082-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:0122-1 Security update for samba SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2020:3081-1 Security update for samba SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-0174 Samba: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 22, 2024
- ELSA-2021-1647 Moderate: samba security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 25, 2021
- ALAS2-2021-1585 Critical: samba security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 6, 2021
- ELSA-2020-5439 Moderate: samba security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 16, 2020
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1891685
- https://www.samba.org/samba/security/CVE-2020-14323.html
- openSUSE-SU-2020:1811 vendor-advisory
- openSUSE-SU-2020:1819 vendor-advisory
- FEDORA-2020-c1e9ae02d2 vendor-advisory
- https://security.netapp.com/advisory/ntap-20201103-0001/
- FEDORA-2020-2e1a1489be vendor-advisory
- [debian-lts-announce] 20201123 [SECURITY] [DLA 2463-1] samba security update mailing-list
- GLSA-202012-24 vendor-advisory
- [debian-lts-announce] 20240422 [SECURITY] [DLA 3792-1] samba security update mailing-list