Description
A flaw was found in Samba's CTDB, the clustered database service used by Samba. Insufficient integrity validation of received CTDB protocol packets allows malformed packets containing invalid field lengths, improperly terminated strings, or inconsistent packet sizes to be processed without adequate bounds checking. A remote attacker with access to the CTDB private network may trigger a denial of service through process crashes or excessive memory consumption and, in limited cases, disclose adjacent memory contents.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Ceph Storage 9.2 | — | — |
| 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 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 5 | — | — |
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 | 2:4.24.5+dfsg-1 | — |
| Debian 13 | samba | 2:4.22.10+dfsg-0+deb13u2 | — |
| Debian 12 | samba | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | samba | 2:4.23.6+dfsg-1ubuntu2.2 | — |
| Ubuntu 24.04 LTS | samba | 2:4.19.5+dfsg-4ubuntu9.7 | — |
| Ubuntu 22.04 LTS | samba | 2:4.15.13+dfsg-0ubuntu1.13 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | samba | No fix yet | — |
| Ubuntu Pro 18.04 LTS | samba | No fix yet | — |
| Ubuntu Pro 16.04 LTS | samba | No fix yet | — |
| Ubuntu Pro 14.04 LTS | samba | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | samba | 4.21.10+git.533.31d7e5508d-150700.3.29.1 | SUSE-SU-2026:3363-1 |
| SLES 15 SP6 | samba | 4.19.8+git.501.67274891bc-150600.3.29.1 | SUSE-SU-2026:3364-1 |
| SLES 15 SP5 | samba | 4.17.12+git.581.f49579c6cd-150500.3.42.1 | SUSE-SU-2026:3365-1 |
| SLES 15 SP4 | samba | 4.15.13+git.808.eeca19f5e1-150400.3.52.1 | SUSE-SU-2026:3362-1 |
| SLES 12 SP5 | samba | 4.15.13+git.729.a8ce057e8d-3.109.1 | SUSE-SU-2026:3367-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | samba | 4.22.11+git.552.66cfeb7de0a-160000.1.1 | SUSE-SU-2026:23152-1, SUSE-SU-2026:23129-1 |
| SLES for SAP 15 SP6 | samba | 4.19.8+git.501.67274891bc-150600.3.29.1 | SUSE-SU-2026:3364-1 |
| SLES for SAP 15 SP5 | samba | 4.17.12+git.581.f49579c6cd-150500.3.42.1 | SUSE-SU-2026:3365-1 |
| SLES for SAP 15 SP4 | samba | 4.15.13+git.808.eeca19f5e1-150400.3.52.1 | SUSE-SU-2026:3362-1 |
| SLES 16.0 | samba | 4.22.11+git.552.66cfeb7de0a-160000.1.1 | SUSE-SU-2026:23152-1, SUSE-SU-2026:23129-1 |
| SLE Micro 6.2 | samba | 4.22.9+git.538.af6cb4fb2e-160000.1.1 | SUSE-SU-2026:23003-1, SUSE-SU-2026:22977-1 |
| SLE Micro 5.5 | samba | 4.17.12+git.581.f49579c6cd-150500.3.42.1 | SUSE-SU-2026:3365-1 |
| SLE Micro 5.4 | samba | 4.15.13+git.808.eeca19f5e1-150400.3.52.1 | SUSE-SU-2026:3362-1 |
| SLE Micro 5.3 | samba | 4.15.13+git.808.eeca19f5e1-150400.3.52.1 | SUSE-SU-2026:3362-1 |
| SLE HPC 15 SP5 | samba | 4.17.12+git.581.f49579c6cd-150500.3.42.1 | SUSE-SU-2026:3365-1 |
| SLE HPC 15 SP4 | samba | 4.15.13+git.808.eeca19f5e1-150400.3.52.1 | SUSE-SU-2026:3362-1 |
| SUSE Enterprise Storage 7.1 | samba | 4.15.13+git.808.eeca19f5e1-150300.3.106.1 | SUSE-SU-2026:3366-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | samba | 4.24.5+git.481.dba78dbdea-1.1 | openSUSE-SU-2026:11431-1 |
| openSUSE Leap 16.0 | samba | 4.22.9+git.538.af6cb4fb2e-160000.1.1 | openSUSE-SU-2026:21540-1, openSUSE-SU-2026:21475-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | ctdb +26 | 4.10.16-24.amzn2.0.9 | ALAS2-2026-3886 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | samba | No fix yet | — |
Advisories 15
- WID-SEC-2026-2549 Samba: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 20, 2026
- ALAS2-2026-3886 Important: samba security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- SUSE-SU-2026:23152-1 Security update for samba SUSE / openSUSE Security Updates · Aug 14, 2026
- SUSE-SU-2026:23129-1 Security update for samba SUSE / openSUSE Security Updates · Aug 14, 2026
- SUSE-SU-2026:23003-1 Security update for samba SUSE / openSUSE Security Updates · Aug 12, 2026
- openSUSE-SU-2026:21540-1 Security update for samba SUSE / openSUSE Security Updates · Aug 8, 2026
- SUSE-SU-2026:22977-1 Security update for samba SUSE / openSUSE Security Updates · Aug 4, 2026
- openSUSE-SU-2026:11431-1 ctdb-4.24.5+git.481.dba78dbdea-1.1 on GA media SUSE / openSUSE Security Updates · Aug 2, 2026
- openSUSE-SU-2026:21475-1 Security update for samba SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:3364-1 Security update for samba SUSE / openSUSE Security Updates · Jul 29, 2026
- SUSE-SU-2026:3365-1 Security update for samba SUSE / openSUSE Security Updates · Jul 29, 2026
- SUSE-SU-2026:3366-1 Security update for samba SUSE / openSUSE Security Updates · Jul 29, 2026
- SUSE-SU-2026:3367-1 Security update for samba SUSE / openSUSE Security Updates · Jul 29, 2026
- SUSE-SU-2026:3362-1 Security update for samba SUSE / openSUSE Security Updates · Jul 29, 2026
- SUSE-SU-2026:3363-1 Security update for samba SUSE / openSUSE Security Updates · Jul 29, 2026