CVE-2023-39193

Kernel: netfilter: xtables sctp out-of-bounds read in match_flags()

Published Oct 9, 2023 CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Description
A flaw was found in the Netfilter subsystem in the Linux kernel. The sctp_mt_check did not validate the flag_count 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.

Remediation

Vendor Workaround

This flaw can be mitigated by preventing the affected `xt_sctp` kernel module from being loaded. For instructions on how to blacklist a kernel module, please see https://access.redhat.com/solutions/41278.

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-3710-1 linux security update
EUVD EUVD EUVD-2023-42928 A flaw was found in the Netfilter subsystem in the Linux kernel. The sctp_mt_check did not validate the flag_count 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.
Ubuntu USN Ubuntu USN USN-6494-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6494-2 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6532-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6534-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6534-2 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6534-3 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6548-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6548-2 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6548-3 Linux kernel (Oracle) vulnerabilities
Ubuntu USN Ubuntu USN USN-6549-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6549-2 Linux kernel (GKE) vulnerabilities
Ubuntu USN Ubuntu USN USN-6549-3 Linux kernel (Low Latency) vulnerabilities
Ubuntu USN Ubuntu USN USN-6548-4 Linux kernel (GKE) vulnerabilities
Ubuntu USN Ubuntu USN USN-6548-5 Linux kernel (IoT) vulnerabilities
Ubuntu USN Ubuntu USN USN-6549-4 Linux kernel (Intel IoTG) vulnerabilities
Ubuntu USN Ubuntu USN USN-6549-5 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6635-1 Linux kernel (GCP) vulnerabilities
History
Type Values Removed Values Added
First Time appeared Redhat rhel Els
CPEs cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:rhel_els:6
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat rhel Els
Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 7, 2026, 11:32 AM
Reserved
Jul 25, 2023, 4:01 PM
Status
Modified
Published
Oct 9, 2023, 6:15 PM
Modified
Nov 7, 2026, 12:17 PM
Severity
Moderate
Public date
Sep 29, 2023, 12:00 AM