HOMEVULNERABILITIESCVE-2023-2236
HIGH

CVE-2023-2236

CWE-416Published: May 1, 2023· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2023-2236 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Linux1 product(s)
linux kernel
netapp1 product(s)
hci baseboard management controller
Source: NVD CPE · 6 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9d94c04c0db024922e886c9fd429659f22f48ea4
PATCHhttps://kernel.dance/9d94c04c0db024922e886c9fd429659f22f48ea4
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9d94c04c0db024922e886c9fd429659f22f48ea4
PATCHhttps://kernel.dance/9d94c04c0db024922e886c9fd429659f22f48ea4
ADVISORYhttps://security.netapp.com/advisory/ntap-20230601-0010/
ADVISORYhttps://security.netapp.com/advisory/ntap-20230601-0010/

All References (6)

→
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

Quick Facts

CVE IDCVE-2023-2236
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-416
CISA KEVNo
Affected2 vendor(s)
PublishedMay 1, 2023

Related CVEs (CWE-416)

CVE-2011-0982
10.0
CVE-2015-5095
10.0
CVE-2026-13782
10.0
CVE-2010-3252
10.0
CVE-2015-4448
10.0
CVE-2015-5099
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-2236 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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