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Advisory severityMedium6.7Red Hat Linux

Medium [CVE-2023-39192] Kernel: netfilter: xtables out-of-bounds read in u32_match_it

This medium-severity Red Hat Linux advisory covers CVE-2023-39192 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2023-39192 Source published Source updated

VulniPulse record published

CVE-2023-39192
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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Summary

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. Red Hat Enterprise Linux 9 is not affected by this flaw as the `xt_u32` driver is not built.

Red Hat severity: Moderate — CVSS 6.7 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:L). Weakness: CWE-125.

Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat fixing advisory: RHSA-2024:2950, RHSA-2024:3138.

Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat package: kernel-rt.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 9 hours ago·verify at source

Fixed versions
  • kernel-rt-0:4.18.0-553.rt7.342.el8_10
  • kernel-0:4.18.0-553.el8_10
  • RHSA-2024:2950
  • RHSA-2024:3138

Official advisory · high-confidence parse· fetched 9 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • This flaw can be mitigated by preventing the affected `xt_u32` kernel module from being loaded. For instructions on how to blacklist a kernel module, please see https://access.redhat.com/solutions/41278.

Official advisory · high-confidence parse· fetched 9 hours ago·verify at source

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