CVE-2026-84042
Crun: crun: rootful krun with passt executes container payload as host root
A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Crun: crun: rootful krun with passt executes container payload as host root
A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29
- Record
CVE-2026-84042- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-269
- Updated
- 2026-11-02
EUVDEUVD-2026-75321
A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29
- Record
EUVD-2026-75321- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-ggww-wrxv-mmw2
A flaw was found in crun. When crun is built with libkrun and a container is started rootful with...
A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29
- Record
GHSA-ggww-wrxv-mmw2- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-269
- Updated
- 2026-11-02
NVD
A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29
- Record
CVE-2026-84042- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-269
- Updated
- 2026-11-05
OSVALPINE-CVE-2026-84042
A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29
- Record
ALPINE-CVE-2026-84042- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H - Updated
- 2026-11-03
OSVBELL-CVE-2026-84042
- Record
BELL-CVE-2026-84042- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-84042
A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29
- Record
UBUNTU-CVE-2026-84042- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H - Updated
- 2026-11-02
OSVopenSUSE-SU-2026:12162-1 No score
crun-1.30.1-1.1 on GA media
These are all security issues fixed in the crun-1.30.1-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2026:12162-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
crunAlpine:v3.24 |
before 1.30.1-r0 | 1.30.1-r0 |
crunAlpaquita:stream |
1.8.5-r0 up to 1.30.1-r0 | 1.30.1-r0 |
crunUbuntu:20.04:LTS |
All versions, plus listed versions 0.10.5+dfsg-10.10.6+dfsg-10.11+dfsg-10.12+dfsg-10.12.1+dfsg-1 |
None known |
crunUbuntu:22.04:LTS |
All versions, plus listed versions 0.17+dfsg-10.17+dfsg-1.10.17+dfsg-1.1ubuntu0.1 |
None known |
crunUbuntu:24.04:LTS |
All versions, plus listed versions 1.8.5-11.11-11.11.1-11.12-11.13-11.14-11.14.1-1 |
None known |
crunUbuntu:26.10 |
All versions, plus listed versions 1.21-1ubuntu3 |
None known |
crunUbuntu:26.04:LTS |
All versions, plus listed versions 1.21-1ubuntu21.21-1ubuntu3 |
None known |
crunopenSUSE:Tumbleweed From an advisory covering 3 CVEs |
before 1.30.1-1.1 | 1.30.1-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| facts | NVD | |
| affected, aliases, references | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-84042 is a high vulnerability (CVSS 7.8) in Red Hat Enterprise Linux 10, published September 10, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.10%, the 0th percentile. Fixed in crun 1.30.1-r0.