Description
A unit confusion in BusyBox TLS Montgomery reduction buffer allocation causes a pre-authentication heap buffer overflow when processing a crafted ClientKeyExchange message.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Hardened Images | — | — |
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 | busybox | No fix yet | — |
| Debian 13 | busybox | No fix yet | — |
| Debian 12 | busybox | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | busybox | No fix yet | — |
| Ubuntu 26.04 LTS | busybox | No fix yet | — |
| Ubuntu 24.04 LTS | busybox | No fix yet | — |
| Ubuntu 22.04 LTS | busybox | No fix yet | — |
| Ubuntu 20.04 LTS | busybox | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | busybox | No fix yet | — |
| Ubuntu Pro 16.04 LTS | busybox | No fix yet | — |
| Ubuntu Pro 14.04 LTS | busybox | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | busybox | 1.37.0-150700.18.24.1 | SUSE-SU-2026:4760-1 |
| SLES 15 SP4 | busybox | 1.35.0-150400.3.23.1 | SUSE-SU-2026:4798-1 |
| SLES 12 SP5 | busybox | 1.35.0-10.12.1 | SUSE-SU-2026:4773-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | busybox | 1.37.0-160000.8.1 | SUSE-SU-2026:24215-1 |
| SLES for SAP 15 SP4 | busybox | 1.35.0-150400.3.23.1 | SUSE-SU-2026:4798-1 |
| SLES 16.0 | busybox | 1.37.0-160000.8.1 | SUSE-SU-2026:24215-1 |
| SLE Micro 6.0 | busybox | 1.36.1-159998.1.1 | SUSE-SU-2026:24137-1 |
| SLE HPC 15 SP4 | busybox | 1.35.0-150400.3.23.1 | SUSE-SU-2026:4798-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | busybox | 1.38.0-3.1 | openSUSE-SU-2026:11954-1 |
| openSUSE Leap 16.0 | busybox | 1.37.0-160000.8.1 | openSUSE-SU-2026:22067-1 |
Advisories 8
- WID-SEC-2026-3557 BusyBox: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 21, 2026
- SUSE-SU-2026:4798-1 Security update for busybox SUSE / openSUSE Security Updates · Oct 21, 2026
- SUSE-SU-2026:24215-1 Security update for busybox SUSE / openSUSE Security Updates · Oct 21, 2026
- SUSE-SU-2026:4760-1 Security update for busybox SUSE / openSUSE Security Updates · Oct 21, 2026
- SUSE-SU-2026:4773-1 Security update for busybox SUSE / openSUSE Security Updates · Oct 21, 2026
- openSUSE-SU-2026:22067-1 Security update for busybox SUSE / openSUSE Security Updates · Oct 19, 2026
- SUSE-SU-2026:24137-1 Security update for busybox SUSE / openSUSE Security Updates · Oct 15, 2026
- openSUSE-SU-2026:11954-1 busybox-1.38.0-3.1 on GA media SUSE / openSUSE Security Updates · Oct 3, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-88830 vdb-entry
- RHBZ#2531344 issue-tracking