What is CVE-2023-4394?

CVE-2023-4394 is a medium-severity vulnerability in Linux Kernel, classified under Uncontrolled Resource Consumption. CVSS score: 6.7/10. Published 2023-08-17.

How severe is CVE-2023-4394?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Use After Free in Linux Kernel

CVE-2023-4394

A use-after-free flaw was found in btrfs_get_dev_args_from_path in fs/btrfs/volumes.c in btrfs file-system in the Linux Kernel. This flaw allows a local attacker with special privileges to cause a system crash or leak internal kernel information

Vulnerability class: DoS (Denial of Service)

Published 2023-08-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (11.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

References

access.redhat.com/security/cve/CVE-2023-4394 (Third Party Advisory, vdb-entry, Issue Tracking)
bugzilla.redhat.com/show_bug.cgi (issue-tracking, Patch, Third Party Advisory, Issue Tracking)
patchwork.kernel.org/project/linux-btrfs/patch/20220815151606.3479183-1-r33s3n6… (Patch, Mailing List, Vendor Advisory)

Frequently asked questions

What is CVE-2023-4394?: CVE-2023-4394 is a medium-severity vulnerability in Linux Kernel, classified under Uncontrolled Resource Consumption. CVSS score: 6.7/10. Published 2023-08-17.
How severe is CVE-2023-4394?: Medium severity. CVSS v3 base score is 6.7 out of 10.