Loop with Unreachable Exit Condition ('Infinite Loop') Affecting kernel-64k-debug-core package, versions <0:5.14.0-427.37.1.el9_4


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-RHEL9-KERNEL64KDEBUGCORE-8464131
  • published5 Dec 2024
  • disclosed7 Aug 2024

Introduced: 7 Aug 2024

CVE-2024-42246  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

Upgrade RHEL:9 kernel-64k-debug-core to version 0:5.14.0-427.37.1.el9_4 or higher.
This issue was patched in RHSA-2024:6997.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-64k-debug-core package and not the kernel-64k-debug-core package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

net, sunrpc: Remap EPERM in case of connection failure in xs_tcp_setup_socket

When using a BPF program on kernel_connect(), the call can return -EPERM. This causes xs_tcp_setup_socket() to loop forever, filling up the syslog and causing the kernel to potentially freeze up.

Neil suggested:

This will propagate -EPERM up into other layers which might not be ready to handle it. It might be safer to map EPERM to an error we would be more likely to expect from the network system - such as ECONNREFUSED or ENETDOWN.

ECONNREFUSED as error seems reasonable. For programs setting a different error can be out of reach (see handling in 4fbac77d2d09) in particular on kernels which do not have f10d05966196 ("bpf: Make BPF_PROG_RUN_ARRAY return -err instead of allow boolean"), thus given that it is better to simply remap for consistent behavior. UDP does handle EPERM in xs_udp_send_request().

CVSS Scores

version 3.1