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osvGoogleOSV:UBUNTU-CVE-2021-47579
HistoryJun 19, 2024 - 3:15 p.m.

UBUNTU-CVE-2021-47579

2024-06-1915:15:00
Google
osv.dev
4
linux kernel
vulnerability
ovl
warning fix
syzbot
filesystem
mkdir
dentry
overlayfs
setup

AI Score

6.5

Confidence

Low

In the Linux kernel, the following vulnerability has been resolved: ovl: fix warning in ovl_create_real() Syzbot triggered the following warning in ovl_workdir_create() -> ovl_create_real(): if (!err && WARN_ON(!newdentry->d_inode)) { The reason is that the cgroup2 filesystem returns from mkdir without instantiating the new dentry. Weird filesystems such as this will be rejected by overlayfs at a later stage during setup, but to prevent such a warning, call ovl_mkdir_real() directly from ovl_workdir_create() and reject this case early.