Description
Since the Windows Kerberos RC4-HMAC Elevation of Privilege Vulnerability was disclosed by Microsoft on Nov 8 2022 and per RFC8429 it is assumed that rc4-hmac is weak, Vulnerable Samba Active Directory DCs will issue rc4-hmac encrypted tickets despite the target server supporting better encryption (eg aes256-cts-hmac-sha1-96).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Samba | Fixed in samba 4.15.13, samba 4.16.8, samba 4.15.13 | — |
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 | 2:4.16.0+dfsg-2 | — |
| Debian 13 | samba | 2:4.16.0+dfsg-2 | — |
| Debian 12 | samba | 2:4.16.0+dfsg-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | samba | 2:4.15.13+dfsg-0ubuntu1 | USN-5822-1 |
| Ubuntu 20.04 LTS | samba | 2:4.15.13+dfsg-0ubuntu0.20.04.1 | USN-5936-1, USN-5822-1 |
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 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.16 | samba | 4.15.13-r0 | — |
| Alpine v3.15 | samba | 4.15.13-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | samba +29 | 2:4.17.5-0.amzn2023.0.2 | ALAS2023-2023-032 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | samba | 4.18.3-1 | — |
| Azure Linux 2 (CBL-Mariner) | samba | No fix yet | — |
Advisories 5
- USN-7582-1 samba vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-5936-1 samba vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-5822-1 samba vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- WID-SEC-2022-2365 Samba: Mehrere Schwachstellen ermöglichen Privilegieneskalation BSI CERT-Bund (WID) · Jun 29, 2025
- ALAS2023-2023-032 Important: samba security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 15, 2024