Description
crun is an open source OCI Container Runtime fully written in C. Prior to version 1.28, crun-s default device setup opens the container rootfs `/dev` directory without `O_NOFOLLOW`. If an OCI bundle contains `rootfs/dev` as a symlink and the bundle configuration does not mount `/dev`, crun follows that symlink and creates the default device nodes and stdio symlinks at the symlink target outside the container rootfs. In a local rootful crun replay, this created fixed device nodes and symlinks outside the rootfs before crun returned failure. A pre-existing file named `ptmx` in the target directory was also replaced by crun-s forced `ptmx -> pts/ptmx` symlink. Version 1.28 fixes the issue.
CVSS 5.1EPSS 0.161%Risk 0.52
View source- Published
- 2026-08-14 17:18:18
- Affected versions
- <1.28
- Type
- Library
- Last modified
- 2026-08-14 17:18:18
- Vector
- CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X