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Advisory severityMedium6.5Red Hat Linux

Medium [CVE-2023-42755] Kernel: rsvp: out-of-bounds read in rsvp_classify

This medium-severity Red Hat Linux advisory covers CVE-2023-42755 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-2023-42755 Source published Source updated

VulniPulse record published

CVE-2023-42755
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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Summary

A flaw was found in the IPv4 Resource Reservation Protocol (RSVP) classifier in the Linux kernel. The xprt pointer may go beyond the linear part of the skb, leading to an out-of-bounds read in the `rsvp_classify` function.

This issue may allow a local user to crash the system and cause a denial of service. The rsvp classifier has been retired upstream (commit 265b4da "net/sched: Retire rsvp classifier").

Red Hat Enterprise Linux 9 is not affected by this CVE. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H).

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 `cls_rsvp` 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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