Improper Input Validation Affecting kernel-cross-headers package, versions <0:4.18.0-372.111.1.el8_6
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Test your applications- Snyk ID SNYK-RHEL8-KERNELCROSSHEADERS-7441117
- published 11 Jul 2024
- disclosed 21 May 2024
Introduced: 21 May 2024
CVE-2021-47293 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-cross-headers to version 0:4.18.0-372.111.1.el8_6 or higher.
This issue was patched in RHSA-2024:4447.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-cross-headers package and not the kernel-cross-headers package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_skbmod: Skip non-Ethernet packets
Currently tcf_skbmod_act() assumes that packets use Ethernet as their L2 protocol, which is not always the case. As an example, for CAN devices:
$ ip link add dev vcan0 type vcan
$ ip link set up vcan0
$ tc qdisc add dev vcan0 root handle 1: htb
$ tc filter add dev vcan0 parent 1: protocol ip prio 10 \
matchall action skbmod swap mac
Doing the above silently corrupts all the packets. Do not perform skbmod actions for non-Ethernet packets.
References
- https://access.redhat.com/security/cve/CVE-2021-47293
- https://git.kernel.org/stable/c/071729150be9e1d1b851b70efb6d91ee9269d57b
- https://git.kernel.org/stable/c/34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d
- https://git.kernel.org/stable/c/727d6a8b7ef3d25080fad228b2c4a1d4da5999c6
- https://git.kernel.org/stable/c/a88414fb1117f2fe65fb88e45ba694e1d09d5024
- https://git.kernel.org/stable/c/e4fdca366806f6bab374d1a95e626a10a3854b0c