5.5

CVE-2021-47579: ovl: fix warning in ovl_create_real()

Analyzed
AliasesUBUNTU-CVE-2021-47579DEBIAN-CVE-2021-47579
Published 19-06-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47579 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3
RHSA-2024:2394RHSA-2024:5101RHSA-2024:5102

Timeline

  1. 19-06-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu89 products
  • linuxAll versions (No fix recorded) | < 5.4.0-105.119
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1069.73
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c, < 445d2dc63e5871d218f21b8f62ab29ac72f2e6b8 | ≥ e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c, < f9f300a92297be8250547347fd52216ef0177ae0 | ≥ e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c, < 6859985a2fbda5d1586bf44538853e1be69e85f7 | ≥ e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c, < d2ccdd4e4efab06178608a34d7bfb20a54104c02 | ≥ e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c, < 1f5573cfe7a7056e80a92c7a037a3e69f3a13d1c | 3.18
  • linux_kernel< 4.19.222 | ≥ 4.20, < 5.4.168 | ≥ 5.5, < 5.10.88 | ≥ 5.11, < 5.15.11
Debian1 product
  • linux< 5.15.15-1

3 vendors · 92 products

References

9 links