CVE-2021-47579
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…
Does this matter?
Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.24% probability · 15th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1f5573cfe7a7056e80a92c7a037a3e69f3a13d1cPatch
- https://git.kernel.org/stable/c/445d2dc63e5871d218f21b8f62ab29ac72f2e6b8Patch
- https://git.kernel.org/stable/c/6859985a2fbda5d1586bf44538853e1be69e85f7Patch
- https://git.kernel.org/stable/c/d2ccdd4e4efab06178608a34d7bfb20a54104c02Patch
- https://git.kernel.org/stable/c/f9f300a92297be8250547347fd52216ef0177ae0Patch
- https://git.kernel.org/stable/c/1f5573cfe7a7056e80a92c7a037a3e69f3a13d1cPatch
- https://git.kernel.org/stable/c/445d2dc63e5871d218f21b8f62ab29ac72f2e6b8Patch
- https://git.kernel.org/stable/c/6859985a2fbda5d1586bf44538853e1be69e85f7Patch
- https://git.kernel.org/stable/c/d2ccdd4e4efab06178608a34d7bfb20a54104c02Patch
- https://git.kernel.org/stable/c/f9f300a92297be8250547347fd52216ef0177ae0Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.