Description
The add_probe function in modutils/modprobe.c in BusyBox before 1.23.0 allows local users to bypass intended restrictions on loading kernel modules via a / (slash) character in a module name, as demonstrated by an "ifconfig /usbserial up" command or a "mount -t /snd_pcm none /" command.
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 | 1:1.22.0-15 | — |
| Debian 13 | busybox | 1:1.22.0-15 | — |
| Debian 12 | busybox | 1:1.22.0-15 | — |
| Debian 8 | busybox | 1:1.22.0-9+deb8u2 | DLA-1445-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | busybox | 1:1.27.2-2ubuntu3.2 | USN-3935-1 |
| Ubuntu 16.04 LTS | busybox | 1:1.22.0-15ubuntu1.4 | USN-3935-1 |
| Ubuntu 14.04 LTS | busybox | 1:1.21.0-1ubuntu1.4 | USN-3935-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | busybox | 1.35.0-150400.3.8.1 | SUSE-SU-2022:4371-1 |
| SLES 15 SP3 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
| SLES 15 SP2 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
| SLES 15 SP1 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
| SLES 15 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
Show 21 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | busybox | 1.35.0-4.3.1 | SUSE-SU-2022:4253-1 |
| SLES 12 SP4 | busybox | 1.35.0-4.3.1 | SUSE-SU-2022:4253-1 |
| SLES 12 SP3 | busybox | 1.35.0-4.3.1 | SUSE-SU-2022:4253-1 |
| SLES 12 SP2 | busybox | 1.35.0-4.3.1 | SUSE-SU-2022:4253-1 |
| SLES 12 | busybox | 1.21.1-3.3 | SUSE-SU-2015:1445-1 |
| SLES for SAP 15 SP2 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
| SLES for SAP 15 SP1 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
| SLES for SAP 15 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
| SLES for SAP 12 SP5 | busybox | 1.35.0-4.3.1 | SUSE-SU-2022:4253-1 |
| SLES for SAP 12 SP4 | busybox | 1.35.0-4.3.1 | SUSE-SU-2022:4253-1 |
| SLES for SAP 12 | busybox | 1.21.1-3.3 | SUSE-SU-2015:1445-1 |
| SLE HPC 15 SP2 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
| SLE HPC 15 SP1 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
| SLE HPC 15 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
| SUSE OpenStack Cloud Crowbar 9 | busybox | 1.35.0-4.3.1 | SUSE-SU-2022:4253-1 |
| SUSE OpenStack Cloud 9 | busybox | 1.35.0-4.3.1 | SUSE-SU-2022:4253-1 |
| SUSE Manager Server 4.1 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
| SUSE Manager Retail Branch Server 4.1 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
| SUSE Manager Proxy 4.1 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
| SUSE Enterprise Storage 7 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
| SUSE Enterprise Storage 6 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | busybox | 1.35.0-6.1 | openSUSE-SU-2024:12415-1 |
| openSUSE Leap 15.4 | busybox | 1.35.0-150400.3.8.1 | SUSE-SU-2022:4371-1 |
| openSUSE Leap 15.4 | busybox-links | 1.35.0-150400.4.3.14 | SUSE-SU-2022:4371-1 |
| openSUSE Leap 15.3 | busybox | 1.35.0-150000.4.14.1 | SUSE-SU-2022:4260-1 |
Advisories 7
- DLA-1445-1 busybox - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3935-1 busybox vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2022:4371-1 Security update for busybox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4260-1 Security update for busybox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2015:1445-1 Security update for busybox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4253-1 Security update for busybox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12415-1 busybox-1.35.0-6.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://plus.google.com/+MathiasKrause/posts/PqFCo4bfrWu
- https://bugs.busybox.net/show_bug.cgi?id=7652
- [oss-security] 20150124 Re: CVE Request: Linux kernel crypto api unprivileged arbitrary module load mailing-list
- GLSA-201503-13 vendor-advisory
- 72324 vdb-entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1185707
- [debian-lts-announce] 20180727 [SECURITY] [DLA 1445-1] busybox security update mailing-list
- http://git.busybox.net/busybox/commit/?id=4e314faa0aecb66717418e9a47a4451aec59262b
- USN-3935-1 vendor-advisory
- 20200313 SEC Consult SA-20200312-0 :: Authenticated Command Injection in Phoenix Contact TC Router & TC Cloud Client mailing-list