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CVE-2021-47293

Status Candidate

Overview

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.

Related Files

Red Hat Security Advisory 2024-4447-03
Posted Jul 10, 2024
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2024-4447-03 - An update for kernel is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions, and Red Hat Enterprise Linux 8.6 Telecommunications Update Service. Issues addressed include code execution, null pointer, and use-after-free vulnerabilities.

tags | advisory, kernel, vulnerability, code execution
systems | linux, redhat
advisories | CVE-2021-47293
SHA-256 | 6f11b4f2714ff4c452194926276d2d26eba36c76136c39f6ce12024f4b22a2d8
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