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Advisory severityMedium5.5Red Hat Linux

Medium [CVE-2023-42754] Kernel: ipv4: null pointer dereference in ipv4_send_dest_unreach

This medium-severity Red Hat Linux advisory covers CVE-2023-42754 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.

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

CVE-2023-42754 Source published Source updated

VulniPulse record published

CVE-2023-42754
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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Summary

A NULL pointer dereference flaw was found in the Linux kernel ipv4 stack. The socket buffer (skb) was assumed to be associated with a device before calling __ip_options_compile, which is not always the case if the skb is re-routed by ipvs.

This issue may allow a local user with CAP_NET_ADMIN privileges to crash the system. Red Hat Enterprise Linux 6 and 7 are not affected by this CVE, as they did not include the upstream commit that introduced this flaw:.

Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-476.

Red Hat fixing advisory: RHSA-2024:2950, RHSA-2024:3138, RHSA-2024:2394.

Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; 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
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

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

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