CVE-2021-47579: ovl: fix warning in ovl_create_real()
First published: Wed Jun 19 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <4.19.222 | 4.19.222 |
| redhat/kernel | <5.4.168 | 5.4.168 |
| redhat/kernel | <5.10.88 | 5.10.88 |
| redhat/kernel | <5.15.11 | 5.15.11 |
| redhat/kernel | <5.16 | 5.16 |
| IBM Security Verify Governance - Identity Manager | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Software Stack | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Virtual Appliance | <=ISVG 10.0.2 | |
| IBM Security Verify Governance Identity Manager Container | <=ISVG 10.0.2 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://git.kernel.org/stable/c/1f5573cfe7a7056e80a92c7a037a3e69f3a13d1c
- https://git.kernel.org/stable/c/445d2dc63e5871d218f21b8f62ab29ac72f2e6b8
- https://git.kernel.org/stable/c/6859985a2fbda5d1586bf44538853e1be69e85f7
- https://git.kernel.org/stable/c/d2ccdd4e4efab06178608a34d7bfb20a54104c02
- https://git.kernel.org/stable/c/f9f300a92297be8250547347fd52216ef0177ae0
- https://access.redhat.com/security/cve/CVE-2021-47579
- https://lore.kernel.org/linux-cve-announce/2024061915-CVE-2021-47579-4f78@gregkh/T
- https://access.redhat.com/errata/RHSA-2024:5102
- https://access.redhat.com/errata/RHSA-2024:5101
- https://bugzilla.redhat.com/show_bug.cgi?id=2293250
- https://www.ibm.com/support/pages/node/7230443 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2021-47579?
CVE-2021-47579 is classified as a medium severity vulnerability in the Linux kernel.
How do I fix CVE-2021-47579?
To fix CVE-2021-47579, update your Linux kernel to version 4.19.222, 5.4.168, 5.10.88, 5.15.11, or 5.16 as applicable.
Which systems are affected by CVE-2021-47579?
CVE-2021-47579 affects certain versions of the Linux kernel on systems using the cgroup2 filesystem.
What type of issue does CVE-2021-47579 address in the Linux kernel?
CVE-2021-47579 addresses a warning triggered in the Linux kernel related to the ovl_create_real function.
Is CVE-2021-47579 being actively exploited?
As of the last updates, there are no public reports confirming that CVE-2021-47579 is being actively exploited.
- agent/title
- agent/type
- agent/first-publish-date
- agent/author
- collector/nvd-api
- source/NVD
- agent/severity
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2021-47579
- agent/software-canonical-lookup
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/references
- agent/source
- agent/softwarecombine
- agent/description
- agent/tags
- agent/event
- collector/ibm-support
- source/IBM
- agent/software-canonical-lookup-request
- package-manager/redhat
- vendor/ibm
- canonical/ibm security verify governance - identity manager
- version/ibm security verify governance - identity manager/isvg 10.0.2
- canonical/ibm security verify governance, identity manager software stack
- version/ibm security verify governance, identity manager software stack/isvg 10.0.2
- canonical/ibm security verify governance, identity manager virtual appliance
- version/ibm security verify governance, identity manager virtual appliance/isvg 10.0.2
- canonical/ibm security verify governance identity manager container
- version/ibm security verify governance identity manager container/isvg 10.0.2