Loop with Unreachable Exit Condition ('Infinite Loop') Affecting kernel-rt-debug package, versions <0:4.18.0-553.22.1.rt7.363.el8_10
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Test your applications- Snyk ID SNYK-CENTOS8-KERNELRTDEBUG-7664860
- published 9 Aug 2024
- disclosed 7 Aug 2024
Introduced: 7 Aug 2024
CVE-2024-42246 Open this link in a new tabHow to fix?
Upgrade Centos:8 kernel-rt-debug to version 0:4.18.0-553.22.1.rt7.363.el8_10 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug package and not the kernel-rt-debug package as distributed by Centos.
See How to fix? for Centos:8 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().
References
- https://access.redhat.com/security/cve/CVE-2024-42246
- https://git.kernel.org/stable/c/626dfed5fa3bfb41e0dffd796032b555b69f9cde
- https://git.kernel.org/stable/c/d6c686c01c5f12ff8f7264e0ddf71df6cb0d4414
- https://git.kernel.org/stable/c/f2431e7db0fe0daccb2f06bb0d23740affcd2fa6
- https://git.kernel.org/stable/c/f388cfd913a2b96c05339a335f365795db1b36b6
- https://git.kernel.org/stable/c/02ee1976edb21a96ce8e3fd4ef563f14cc16d041
- https://git.kernel.org/stable/c/5d8254e012996cee1a0f9cc920531cb7e4d9a011
- https://git.kernel.org/stable/c/934247ea65bc5eca8bdb7f8c0ddc15cef992a5d6
- https://git.kernel.org/stable/c/bc790261218952635f846aaf90bcc0974f6f62c6