Description
shadow-utils (aka shadow) 4.4 through 4.17.0 establishes a default /etc/subuid behavior (e.g., uid 100000 through 165535 for the first user account) that can realistically conflict with the uids of users defined on locally administered networks, potentially leading to account takeover, e.g., by leveraging newuidmap for access to an NFS home directory (or same-host resources in the case of remote logins by these local network users). NOTE: it may also be argued that system administrators should not have assigned uids, within local networks, that are within the range that can occur in /etc/subuid.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| shadow-maint | shadow-utils | 4.4 – ≤ 4.17.0 | — |
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 | shadow | No fix yet | — |
| Debian 13 | shadow | No fix yet | — |
| Debian 12 | shadow | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | shadow | No fix yet | — |
| Ubuntu 26.04 LTS | shadow | No fix yet | — |
| Ubuntu 25.10 | shadow | No fix yet | — |
| Ubuntu 24.04 LTS | shadow | No fix yet | — |
| Ubuntu 22.04 LTS | shadow | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | shadow | No fix yet | — |
| Ubuntu Pro 18.04 LTS | shadow | No fix yet | — |
| Ubuntu Pro 16.04 LTS | shadow | No fix yet | — |
| Ubuntu Pro 14.04 LTS | shadow | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | shadow-utils +2 | 2:4.15.0-8.el10 | RHSA-2025:20145 |
| RHEL 9 | shadow-utils +2 | 2:4.9-15.el9 | RHSA-2025:20559 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | shadow-utils +2 | 2:4.15.0-8.el10 | ALSA-2025:20145 |
| AlmaLinux 9 | shadow-utils +2 | 2:4.9-15.el9 | ALSA-2025:20559 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | shadow-utils | 2:4.15.0-8.el10 | RLSA-2025:20145 |
| Rocky Linux 9 | shadow-utils | 2:4.9-15.el9 | RLSA-2025:20559 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | shadow-utils | shadow-utils_4.18.0 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
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JonnyWhatshisface/CVE-2024-56433 ★ 0 · Jan 3, 2025
CVE-2024-56433 - shadow-utils Default subordinate ID for local users creates risk of collision
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 9
- ALSA-2025:20145 Low: shadow-utils security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:20559 Low: shadow-utils security update AlmaLinux Security Advisories · Oct 29, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- RHSA-2025:20559 Red Hat Security Advisory: shadow-utils security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:20145 Red Hat Security Advisory: shadow-utils security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- WID-SEC-2024-3754 shadow: Schwachstelle ermöglicht Erlangen von Benutzerrechten BSI CERT-Bund (WID) · Mar 1, 2026
- RLSA-2025:20145 Low: shadow-utils security update Rocky Linux Security Advisories · Dec 2, 2025
- RLSA-2025:20559 Low: shadow-utils security update Rocky Linux Security Advisories · Nov 21, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025