CVE-2023-42755

Public Exploit
Kernel: rsvp: out-of-bounds read in rsvp_classify()

Description

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.

Remediation

Workaround:

  • 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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.01%
Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 6
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 9
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2024:2950 vendor advisory
https://access.redhat.com/errata/RHSA-2024:3138 vendor advisory
https://access.redhat.com/security/cve/CVE-2023-42755 third party advisory vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=2239847 patch third party advisory issue tracking
https://seclists.org/oss-sec/2023/q3/229 patch mailing list exploit third party advisory
https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html

Frequently Asked Questions

What is the severity of CVE-2023-42755?
CVE-2023-42755 has been scored as a medium severity vulnerability.
How to fix CVE-2023-42755?
As a workaround for remediating CVE-2023-42755: 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.
Is CVE-2023-42755 being actively exploited in the wild?
It is possible that CVE-2023-42755 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-42755?
CVE-2023-42755 affects Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9.
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