CVE-2025-24965

crun is a fast and low-memory footprint OCI Container Runtime fully written in C.

Security Fix(es):

crun is an open source OCI Container Runtime fully written in C. In affected versions A malicious container image could trick the krun handler into escaping the root filesystem, allowing file creation or modification on the host. No special permissions are needed, only the ability for the current user to write to the target file. The problem is fixed in crun 1.20 and all users are advised to upgrade. There are no known workarounds for this vulnerability.(CVE-2025-24965)

crun is a fast and low-memory footprint OCI Container Runtime fully written in C.

Security Fix(es):

crun is an open source OCI Container Runtime fully written in C. In affected versions A malicious container image could trick the krun handler into escaping the root filesystem, allowing file creation or modification on the host. No special permissions are needed, only the ability for the current user to write to the target file. The problem is fixed in crun 1.20 and all users are advised to upgrade. There are no known workarounds for this vulnerability.(CVE-2025-24965)

crun is an open source OCI Container Runtime fully written in C. In affected versions A malicious container image could trick the krun handler into escaping the root filesystem, allowing file creation or modification on the host. No special permissions are needed, only the ability for the current user to write to the target file. The problem is fixed in crun 1.20 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

This update for crun fixes the following issues:

Update to 1.20:

• krun: fix CVE-2025-24965. The .krun_config.json file could be created outside of the container rootfs. (bsc#1237421)
• cgroup: reverted the removal of tun/tap from the default allow list, this was done in crun-1.5. The tun/tap device is now added by default again.
• CRIU: do not set network_lock unless explicitly specified.
• status: disallow container names containing slashes in their name.
• linux: Improved error message when failing to set the net.ipv4.ping_group_range sysctl.
• scheduler: Ignore ENOSYS errors when resetting the CPU affinity mask.
• linux: return a better error message when pidfd_open fails with EINVAL.
• cgroup: display the absolute path to cgroup.controllers when a controller is unavailable.
• exec: always call setsid. Now processes created through exec get the correct process group id.

Update to 1.19.1:

• linux: fix a hang if there are no reads from the tty. Use non blocking sockets to read and write from the tty so that the 'crun exec' process doesn't hang when the terminal is not consuming any data.
• linux: remove the workaround needed to mount a cgroup on top of another cgroup mount. The workaround had the disadvantage to temporarily leak a mount on the host. The alternative that is currently used is to mount a temporary tmpfs between the twoo cgroup mounts.

Update to 1.19:

• wasm: add new handler wamr.
• criu: allow passing network lock method to libcriu.
• linux: honor exec cpu affinity mask.
• build: fix build with musl libc.
• crun: use mount API to self-clone.
• cgroup, systemd: do not override devices on update. If the 'update' request has no device block configured, do not reset the previously configuration.
• cgroup: handle case where cgroup v1 freezer is disabled. On systems without the freezer controller, containers were mistakenly reported as paused.
• cgroup: do not stop process on exec. The cpu mask is configured on the systemd scope, the previous workaround to stop the container until the cgroup is fully configured is no longer needed.

• Update to crun v1.18.2 Upstream changelog is available from https://github.com/containers/crun/releases/tag/1.18.2

• Update to crun v1.18. Upstream changelog is available from https://github.com/containers/crun/releases/tag/1.18

Update to 1.17:

• Add --log-level option. It accepts error, warning and error.
• Add debug logs for container creation.
• Fix double-free in crun exec code that could lead to a crash.
• Allow passing an ID to the journald log driver.
• Report 'executable not found' errors after tty has been setup.
• Do not treat EPIPE from hooks as an error.
• Make sure DefaultDependencies is correctly set in the systemd scope.
• Improve the error message when the container process is not found.
• Improve error handling for the mnt namespace restoration.
• Fix error handling for getpwuid_r, recvfrom and libcrun_kill_linux.
• Fix handling of device paths with trailing slashes.

• add url for keyring
• enable leap by disabling wasmedge (not packaged for leap)

Upstream release 1.16.1:

• fix a regression introduced by 1.16 where using 'rshared' rootfs mount propagation and the rootfs itself is a mountpoint.
• inherit user from original process on exec, if not overridden.

Update to 1.16:

• build: fix build for s390x.
• linux: fix mount of special files with rro. Open the mount target with O_PATH to prevent open(2) failures with special files like FIFOs or UNIX sockets.
• Fix sd-bus error handling for cpu quota and period props update.
• container: use relative path for rootfs if possible. If the rootfs cannot be resolved and it is below the current working directory, only use its relative path.
• wasmedge: access container environment variables for the WasmEdge configuration.
• cgroup, systemd: use MemoryMax instead of MemoryLimit. Fixes a warning for using an old configuration…

These are all security issues fixed in the crun-1.20-1.1 package on the GA media of openSUSE Tumbleweed.

This update for crun fixes the following issues:

• CVE-2025-24965: .krun_config.json symlink attack creates or overwrites file on the host (bsc#1237421).