Vulnerability · CVE-2023-39189
A flaw was found in the Netfilter subsystem in the Linux kernel.
Published Oct 9, 2023 · catalog updated Oct 15, 2026 · Amazon Amazon Linux
Check if you run it
No confirmed exploitation is on record for CVE-2023-39189. EPSS is 0.40%. Act only if a listed version of Amazon Amazon Linux is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Medium6.0
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.40%
- Remediation
- Advisory link
- Affected products
- cpe fedoraproject/fedora · cpe linux/linux kernel · cpe redhat/enterprise linux
A flaw was found in the Netfilter subsystem in the Linux kernel. The nfnl_osf_add_callback function did not validate the user mode controlled opt_num field. This flaw allows a local privileged (CAP_NET_ADMIN) attacker to trigger an out-of-bounds read, leading to a crash or information disclosure.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe fedoraproject/fedora38
- cpe linux/linux kernelversion unspecified
- cpe redhat/enterprise linux8.0
- cpe redhat/enterprise linux9.0
How to fix CVE-2023-39189
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2023-39189. EPSS is 0.40%. Act only if a listed version of Amazon Amazon Linux is installed.
Which versions are affected?
Compare what you have installed with redhat/enterprise linux 8.0; redhat/enterprise linux 9.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-125: Out-of-bounds Read. EPSS 0.40%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 9, 2023 · NIST NVD
Detected
A flaw was found in the Netfilter subsystem in the Linux kernel. The nfnl_osf_add_callback function did not validate the user mode controlled opt_num field. This flaw allows a local privileged (CAP_NET_ADMIN) attacker to trigger an out-of-bounds read, leading to a crash or information disclosure.
Oct 15, 2026 · NIST NVD
Updated
A flaw was found in the Netfilter subsystem in the Linux kernel. The nfnl_osf_add_callback function did not validate the user mode controlled opt_num field. This flaw allows a local privileged (CAP_NET_ADMIN) attacker to trigger an out-of-bounds read, leading to a crash or information disclosure.
Sources
- Amazon LinuxVendor advisoryCVE-2023-39189
CVE-2023-1611, CVE-2023-39189, CVE-2023-52975, CVE-2024-47745, CVE-2024-49882, CVE-2024-50036, CVE-2024-50278, CVE-2024-50301, CVE-2025-21759, CVE-2025-21791, CVE-2025-21796, CVE-2025-21858, CVE-2025-21991
alas.aws.amazon.com - CVE.orgVulnerability recordCVE-2023-39189
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2023-39189
30-day exploitation probability 0.4%
first.org - NIST NVDVulnerability recordCVE-2023-39189
A flaw was found in the Netfilter subsystem in the Linux kernel. The nfnl_osf_add_callback function did not validate the user mode controlled opt_num field. This flaw allows a local privileged (CAP_NET_ADMIN) attacker to trigger an out-of-bounds read, leading to a crash or inform
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.