{"id":"DEBIAN-CVE-2021-47293","details":"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:  \t$ ip link add dev vcan0 type vcan \t$ ip link set up vcan0 \t$ tc qdisc add dev vcan0 root handle 1: htb \t$ tc filter add dev vcan0 parent 1: protocol ip prio 10 \\ \t\tmatchall action skbmod swap mac  Doing the above silently corrupts all the packets.  Do not perform skbmod actions for non-Ethernet packets.","modified":"2026-09-15T09:02:31.300930129Z","published":"2024-05-21T15:15:17.243Z","upstream":["CVE-2021-47293"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2021-47293"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.14.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47293.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.14.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47293.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.14.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47293.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}