{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-47293","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-21T13:27:52.130Z","datePublished":"2024-05-21T14:35:17.373Z","dateUpdated":"2025-05-04T07:08:02.072Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T07:08:02.072Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/act_skbmod.c"],"versions":[{"version":"86da71b57383d40993cb90baafb3735cffe5d800","lessThan":"e4fdca366806f6bab374d1a95e626a10a3854b0c","status":"affected","versionType":"git"},{"version":"86da71b57383d40993cb90baafb3735cffe5d800","lessThan":"a88414fb1117f2fe65fb88e45ba694e1d09d5024","status":"affected","versionType":"git"},{"version":"86da71b57383d40993cb90baafb3735cffe5d800","lessThan":"071729150be9e1d1b851b70efb6d91ee9269d57b","status":"affected","versionType":"git"},{"version":"86da71b57383d40993cb90baafb3735cffe5d800","lessThan":"34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d","status":"affected","versionType":"git"},{"version":"86da71b57383d40993cb90baafb3735cffe5d800","lessThan":"727d6a8b7ef3d25080fad228b2c4a1d4da5999c6","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/act_skbmod.c"],"versions":[{"version":"4.9","status":"affected"},{"version":"0","lessThan":"4.9","status":"unaffected","versionType":"semver"},{"version":"4.19.199","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.136","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.54","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.13.6","lessThanOrEqual":"5.13.*","status":"unaffected","versionType":"semver"},{"version":"5.14","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"4.19.199"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.4.136"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.10.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.13.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.14"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/e4fdca366806f6bab374d1a95e626a10a3854b0c"},{"url":"https://git.kernel.org/stable/c/a88414fb1117f2fe65fb88e45ba694e1d09d5024"},{"url":"https://git.kernel.org/stable/c/071729150be9e1d1b851b70efb6d91ee9269d57b"},{"url":"https://git.kernel.org/stable/c/34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d"},{"url":"https://git.kernel.org/stable/c/727d6a8b7ef3d25080fad228b2c4a1d4da5999c6"}],"title":"net/sched: act_skbmod: Skip non-Ethernet packets","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47293","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-05-28T19:25:44.173169Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-04T17:15:12.783Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:32:08.508Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/e4fdca366806f6bab374d1a95e626a10a3854b0c","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/a88414fb1117f2fe65fb88e45ba694e1d09d5024","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/071729150be9e1d1b851b70efb6d91ee9269d57b","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/727d6a8b7ef3d25080fad228b2c4a1d4da5999c6","tags":["x_transferred"]}]}]}}