What’s Vulnerable › Vulnerabilities
CVE-2023-39192: Kernel: netfilter: xtables out-of-bounds read in u32_match_it()
- 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 xt_u32 module did not validate the fields in the xt_u32 structure. This flaw allows a local privileged attacker to trigger an out-of-bounds read by setting the size fields with a value beyond the array boundaries, 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
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-2024:2950
- https://access.redhat.com/errata/RHSA-2024:3138
- https://access.redhat.com/security/cve/CVE-2023-39192
- https://bugzilla.redhat.com/show_bug.cgi?id=2226784
- https://www.zerodayinitiative.com/advisories/ZDI-CAN-18408/
- https://access.redhat.com/errata/RHSA-2024:2950
- https://access.redhat.com/errata/RHSA-2024:3138
- https://access.redhat.com/security/cve/CVE-2023-39192
- https://bugzilla.redhat.com/show_bug.cgi?id=2226784
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
- https://www.zerodayinitiative.com/advisories/ZDI-CAN-18408/
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
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