CVE-2021-47579

See a problem?
Please try reporting it to the source first.
Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47579
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47579.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2021-47579
Downstream
Related
Published
2024-06-19T15:15:52Z
Modified
2025-09-29T17:15:51Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

ovl: fix warning in ovlcreatereal()

Syzbot triggered the following warning in ovlworkdircreate() -> ovlcreatereal():

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 ovlmkdirreal() directly from ovlworkdircreate() and reject this case early.

References

Affected packages