What’s Vulnerable › Vulnerabilities

CVE-2023-39193: Kernel: netfilter: xtables sctp out-of-bounds read in match_flags()

• Severity: medium (CVSS 6.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-09 · updated 2026-10-15
• Weakness: CWE-125

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.

Affected products

• Fedoraproject Fedora: 38
• Linux kernel: before 6.6 — fixed in 6.6
• Red Hat Enterprise Linux: 8.0, 9.0

How to fix

Upgrade to a fixed version: Linux kernel 6.6. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2024:2394
• https://access.redhat.com/errata/RHSA-2024:2950
• https://access.redhat.com/errata/RHSA-2024:3138
• https://access.redhat.com/security/cve/CVE-2023-39193
• https://bugzilla.redhat.com/show_bug.cgi?id=2226787
• https://www.zerodayinitiative.com/advisories/ZDI-CAN-18866/
• https://access.redhat.com/errata/RHSA-2024:2394
• https://access.redhat.com/errata/RHSA-2024:2950
• https://access.redhat.com/errata/RHSA-2024:3138
• https://access.redhat.com/security/cve/CVE-2023-39193
• https://bugzilla.redhat.com/show_bug.cgi?id=2226787
• https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html

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