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Advisory severityMedium6.1Red Hat Linux

Medium [CVE-2023-39193] Kernel: netfilter: xtables sctp out-of-bounds read in match_flags

This medium-severity Red Hat Linux advisory covers CVE-2023-39193 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6.

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

CVE-2023-39193 Source published Source updated

VulniPulse record published

CVE-2023-39193
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 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. Red Hat severity: Moderate — CVSS 6.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L).

Weakness: CWE-125. Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.

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, RHSA-2024:2394.

Affected products named by the advisory: 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
  • kernel-0:5.14.0-427.13.1.el9_4
  • RHSA-2024:2950
  • RHSA-2024:3138
  • RHSA-2024:2394

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_sctp` 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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