CVE-2023-2236

Name: CVE-2023-2236
Creator: NVD / NIST
Published: 2023-05-01T13:15:44.85+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.43%

Last modified Jun 17, 2026

CVE-2023-2236 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation. Both io_install_fixed_file and its callers call fput in a file in case of an error, causing a reference underflow which leads to a use-after-free vulnerability. We recommend upgrading past commit 9d94c04c0db024922e886c9fd429659f22f48ea4.. EPSS estimates a 0.43% chance of exploitation in the next 30 days.

Description

A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation. Both io_install_fixed_file and its callers call fput in a file in case of an error, causing a reference underflow which leads to a use-after-free vulnerability. We recommend upgrading past commit 9d94c04c0db024922e886c9fd429659f22f48ea4.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.43%

34.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 5.19, < 6.0.11
Netapp	Hci Baseboard Management Controller	h300s
Netapp	Hci Baseboard Management Controller	h410c
Netapp	Hci Baseboard Management Controller	h410s
Netapp	Hci Baseboard Management Controller	h500s
Netapp	Hci Baseboard Management Controller	h700s

References

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9d94c04c0db024922e886c9fd429659f22f48ea4Exploit, Mailing List, Patch
https://kernel.dance/9d94c04c0db024922e886c9fd429659f22f48ea4Exploit, Patch
https://security.netapp.com/advisory/ntap-20230601-0010/Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9d94c04c0db024922e886c9fd429659f22f48ea4Exploit, Mailing List, Patch
https://kernel.dance/9d94c04c0db024922e886c9fd429659f22f48ea4Exploit, Patch
https://security.netapp.com/advisory/ntap-20230601-0010/Vendor Advisory

Timeline

Published: May 1, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-2236?

How severe is CVE-2023-2236?

CVE-2023-2236 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.

How do I fix CVE-2023-2236?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-2236?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST