Description
A flaw was found in Samba’s vfs_worm module. The module is intended to provide write-once, read-many (WORM) protections by preventing modification of files after a configurable grace period. Due to insufficient validation during rename operations, an authenticated user with write access to a share could overwrite a protected file by renaming a newly created file over the existing WORM-protected file.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | — | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | — | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.12 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.13 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.14 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.15 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.16 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.17 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.18 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.19 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
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 | 2:4.24.3+dfsg-1 | — |
| Debian 13 | samba | 2:4.22.8+dfsg-0+deb13u2 | — |
| Debian 12 | samba | 2:4.17.12+dfsg-0+deb12u4 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | samba | 2:4.23.6+dfsg-1ubuntu2.1 | — |
| Ubuntu 25.10 | samba | 2:4.22.3+dfsg-4ubuntu2.4 | — |
| Ubuntu 24.04 LTS | samba | 2:4.19.5+dfsg-4ubuntu9.6 | — |
| Ubuntu 22.04 LTS | samba | 2:4.15.13+dfsg-0ubuntu1.12 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | samba +36 | 4.23.5-109.el10_2 | RHSA-2026:22963 |
| RHEL 9 | ctdb +37 | 4.23.5-10.el9_8 | RHSA-2026:25049 |
| RHEL 8 | ctdb +33 | 4.19.4-16.el8_10 | RHSA-2026:22644 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | samba +36 | 4.21.3-114.el10_0.1 | RHSA-2026:28055 |
| RHEL 9.6 EUS | ctdb +37 | 4.21.3-14.el9_6.1 | RHSA-2026:25979 |
| RHEL 9.4 E4S | ctdb +24 | 4.19.4-105.el9_4.4 | RHSA-2026:28053 |
| RHEL 9.2 E4S | ctdb +24 | 4.17.5-105.el9_2.5 | RHSA-2026:28054 |
| RHEL 8.8 TUS | ctdb +28 | 4.17.5-7.el8_8.1 | RHSA-2026:28056 |
| RHEL 8.8 E4S | ctdb +28 | 4.17.5-7.el8_8.1 | RHSA-2026:28056 |
| RHEL 8.6 EUS Long Life | ctdb +21 | 4.15.5-16.el8_6.1 | RHSA-2026:28057 |
| RHEL 8.6 AUS | ctdb +21 | 4.15.5-16.el8_6.1 | RHSA-2026:28057 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | samba +36 | 4.23.5-109.el10_2 | ALSA-2026:22963 |
| AlmaLinux 9 | samba +36 | 4.23.5-10.el9_8 | ALSA-2026:25049 |
| AlmaLinux 8 | ctdb +33 | 4.19.4-16.el8_10 | ALSA-2026:22644 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | samba | 4.23.5-109.el10_2 | RLSA-2026:22963 |
| Rocky Linux 9 | samba | 4.23.5-10.el9_8 | RLSA-2026:25049 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | samba | 4.22.9+git.506.22c03ce0781-160000.1.1 | SUSE-SU-2026:23152-1, SUSE-SU-2026:23129-1, SUSE-SU-2026:22080-1 |
| SLES 16.0 | samba | 4.22.9+git.506.22c03ce0781-160000.1.1 | SUSE-SU-2026:23152-1, SUSE-SU-2026:23129-1, SUSE-SU-2026:22080-1 |
| SLE Micro 6.2 | samba | 4.22.9+git.506.22c03ce0781-160000.1.1 | SUSE-SU-2026:23003-1, SUSE-SU-2026:22045-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | samba | 4.23.8+git.477.f78166bceed-1.1 | openSUSE-SU-2026:10884-1 |
| openSUSE Leap 16.0 | samba | 4.22.9+git.506.22c03ce0781-160000.1.1 | openSUSE-SU-2026:21540-1, openSUSE-SU-2026:20905-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | samba | 4.23.8-r0 | — |
| Alpine v3.23 | samba | 4.22.10-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | samba | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | samba +36 | 4.23.5-109.el10_2 | ELSA-2026-22963 |
| Oracle Linux 9 | samba +36 | 4.23.5-10.el9_8 | ELSA-2026-25049 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | samba +20 | 4.24.3-r0 | — |
Advisories 25
- ALSA-2026:25049 Critical: samba security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:22963 Critical: samba security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:22644 Important: samba security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:28056 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:28057 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:28055 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:28053 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:28054 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:25979 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:25049 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:22963 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:22644 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- WID-SEC-2026-1686 Samba: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 15, 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
- ELSA-2026-22963 Critical: samba security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 16, 2026
- ELSA-2026-25049 Critical: samba security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 23, 2026
- SUSE-SU-2026:22080-1 Security update for samba SUSE / openSUSE Security Updates · Jun 16, 2026
- RLSA-2026:25049 Critical: samba security update Rocky Linux Security Advisories · Jun 13, 2026
- RLSA-2026:22963 Critical: samba security update Rocky Linux Security Advisories · Jun 11, 2026
- SUSE-SU-2026:22045-1 Security update for samba SUSE / openSUSE Security Updates · Jun 10, 2026
- openSUSE-SU-2026:20905-1 Security update for samba SUSE / openSUSE Security Updates · Jun 9, 2026
- openSUSE-SU-2026:10884-1 ctdb-4.23.8+git.477.f78166bceed-1.1 on GA media SUSE / openSUSE Security Updates · May 29, 2026
References
- RHSA-2026:22644 vendor-advisory
- RHSA-2026:22963 vendor-advisory
- RHSA-2026:25049 vendor-advisory
- RHSA-2026:25979 vendor-advisory
- RHSA-2026:28053 vendor-advisory
- RHSA-2026:28054 vendor-advisory
- RHSA-2026:28055 vendor-advisory
- RHSA-2026:28056 vendor-advisory
- RHSA-2026:28057 vendor-advisory
- RHSA-2026:29863 vendor-advisory
- RHSA-2026:56786 vendor-advisory
- RHSA-2026:56853 vendor-advisory
- RHSA-2026:56911 vendor-advisory
- RHSA-2026:57483 vendor-advisory
- RHSA-2026:59831 vendor-advisory
- RHSA-2026:60019 vendor-advisory
- RHSA-2026:62409 vendor-advisory
- RHSA-2026:62549 vendor-advisory
- RHSA-2026:65839 vendor-advisory
- RHSA-2026:65851 vendor-advisory
- RHSA-2026:65907 vendor-advisory
- RHSA-2026:67857 vendor-advisory
- RHSA-2026:70586 vendor-advisory
- RHSA-2026:77320 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-2340 vdb-entry
- RHBZ#2447318 issue-tracking
- https://bugzilla.samba.org/show_bug.cgi?id=15997