cve-2021-47293
Vulnerability from cvelistv5
Published
2024-05-21 14:35
Modified
2024-11-04 12:03
Severity ?
Summary
net/sched: act_skbmod: Skip non-Ethernet packets
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_skbmod: Skip non-Ethernet packets\n\nCurrently tcf_skbmod_act() assumes that packets use Ethernet as their L2\nprotocol, which is not always the case.  As an example, for CAN devices:\n\n\t$ ip link add dev vcan0 type vcan\n\t$ ip link set up vcan0\n\t$ tc qdisc add dev vcan0 root handle 1: htb\n\t$ tc filter add dev vcan0 parent 1: protocol ip prio 10 \\\n\t\tmatchall action skbmod swap mac\n\nDoing the above silently corrupts all the packets.  Do not perform skbmod\nactions for non-Ethernet packets."
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    "cveId": "CVE-2021-47293",
    "datePublished": "2024-05-21T14:35:17.373Z",
    "dateReserved": "2024-05-21T13:27:52.130Z",
    "dateUpdated": "2024-11-04T12:03:07.839Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47293\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:17.243\",\"lastModified\":\"2024-05-21T16:54:26.047\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/sched: act_skbmod: Skip non-Ethernet packets\\n\\nCurrently tcf_skbmod_act() assumes that packets use Ethernet as their L2\\nprotocol, which is not always the case.  As an example, for CAN devices:\\n\\n\\t$ ip link add dev vcan0 type vcan\\n\\t$ ip link set up vcan0\\n\\t$ tc qdisc add dev vcan0 root handle 1: htb\\n\\t$ tc filter add dev vcan0 parent 1: protocol ip prio 10 \\\\\\n\\t\\tmatchall action skbmod swap mac\\n\\nDoing the above silently corrupts all the packets.  Do not perform skbmod\\nactions for non-Ethernet packets.\"},{\"lang\":\"es\",\"value\":\" En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: act_skbmod: omitir paquetes que no sean Ethernet. Actualmente, tcf_skbmod_act() asume que los paquetes usan Ethernet como protocolo L2, lo cual no siempre es el caso. Como ejemplo, para dispositivos CAN: $ 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: protocolo ip prio 10 \\\\ matchall action skbmod swap mac Hacer lo anterior corrompe silenciosamente todos los paquetes. No realice acciones de skbmod para paquetes que no sean Ethernet.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/071729150be9e1d1b851b70efb6d91ee9269d57b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/727d6a8b7ef3d25080fad228b2c4a1d4da5999c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a88414fb1117f2fe65fb88e45ba694e1d09d5024\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e4fdca366806f6bab374d1a95e626a10a3854b0c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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