GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2021-47293 (GCVE-0-2021-47293)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:51
VLAI
Title
net/sched: act_skbmod: Skip non-Ethernet packets
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-28 19:25 UTC
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 86da71b57383d40993cb90baafb3735cffe5d800 , < e4fdca366806f6bab374d1a95e626a10a3854b0c (git)
Affected: 86da71b57383d40993cb90baafb3735cffe5d800 , < a88414fb1117f2fe65fb88e45ba694e1d09d5024 (git)
Affected: 86da71b57383d40993cb90baafb3735cffe5d800 , < 071729150be9e1d1b851b70efb6d91ee9269d57b (git)
Affected: 86da71b57383d40993cb90baafb3735cffe5d800 , < 34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d (git)
Affected: 86da71b57383d40993cb90baafb3735cffe5d800 , < 727d6a8b7ef3d25080fad228b2c4a1d4da5999c6 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 4.19.199 , ≤ 4.19.* (semver)
Unaffected: 5.4.136 , ≤ 5.4.* (semver)
Unaffected: 5.10.54 , ≤ 5.10.* (semver)
Unaffected: 5.13.6 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47293",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-28T19:25:44.173169Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:15:12.783Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:32:08.508Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "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"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/act_skbmod.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e4fdca366806f6bab374d1a95e626a10a3854b0c",
              "status": "affected",
              "version": "86da71b57383d40993cb90baafb3735cffe5d800",
              "versionType": "git"
            },
            {
              "lessThan": "a88414fb1117f2fe65fb88e45ba694e1d09d5024",
              "status": "affected",
              "version": "86da71b57383d40993cb90baafb3735cffe5d800",
              "versionType": "git"
            },
            {
              "lessThan": "071729150be9e1d1b851b70efb6d91ee9269d57b",
              "status": "affected",
              "version": "86da71b57383d40993cb90baafb3735cffe5d800",
              "versionType": "git"
            },
            {
              "lessThan": "34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d",
              "status": "affected",
              "version": "86da71b57383d40993cb90baafb3735cffe5d800",
              "versionType": "git"
            },
            {
              "lessThan": "727d6a8b7ef3d25080fad228b2c4a1d4da5999c6",
              "status": "affected",
              "version": "86da71b57383d40993cb90baafb3735cffe5d800",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sched/act_skbmod.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.9"
            },
            {
              "lessThan": "4.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.199",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.136",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.13.*",
              "status": "unaffected",
              "version": "5.13.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.199",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.136",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.54",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.13.6",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.14",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T13:51:41.284Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47293",
    "datePublished": "2024-05-21T14:35:17.373Z",
    "dateReserved": "2024-05-21T13:27:52.130Z",
    "dateUpdated": "2026-05-11T13:51:41.284Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-47293",
      "date": "2026-09-16",
      "epss": "0.00234",
      "percentile": "0.14474"
    },
    "fkie_nvd": {
      "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.\"}]",
      "id": "CVE-2021-47293",
      "lastModified": "2024-11-21T06:35:48.817",
      "published": "2024-05-21T15:15:17.243",
      "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\"}, {\"url\": \"https://git.kernel.org/stable/c/071729150be9e1d1b851b70efb6d91ee9269d57b\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/727d6a8b7ef3d25080fad228b2c4a1d4da5999c6\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/a88414fb1117f2fe65fb88e45ba694e1d09d5024\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/e4fdca366806f6bab374d1a95e626a10a3854b0c\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47293\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:17.243\",\"lastModified\":\"2026-06-17T04:17:07.313\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sched/act_skbmod.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"86da71b57383d40993cb90baafb3735cffe5d800\",\"lessThan\":\"e4fdca366806f6bab374d1a95e626a10a3854b0c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"86da71b57383d40993cb90baafb3735cffe5d800\",\"lessThan\":\"a88414fb1117f2fe65fb88e45ba694e1d09d5024\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"86da71b57383d40993cb90baafb3735cffe5d800\",\"lessThan\":\"071729150be9e1d1b851b70efb6d91ee9269d57b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"86da71b57383d40993cb90baafb3735cffe5d800\",\"lessThan\":\"34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"86da71b57383d40993cb90baafb3735cffe5d800\",\"lessThan\":\"727d6a8b7ef3d25080fad228b2c4a1d4da5999c6\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sched/act_skbmod.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.199\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.136\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.54\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.13.6\",\"lessThanOrEqual\":\"5.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.14\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-05-28T19:25:44.173169Z\",\"id\":\"CVE-2021-47293\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.9\",\"versionEndExcluding\":\"4.19.199\",\"matchCriteriaId\":\"44776629-4D21-459F-A55F-103B063D3F6C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.136\",\"matchCriteriaId\":\"E1FCD98C-8886-4844-B7AF-C42731DF9465\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.54\",\"matchCriteriaId\":\"1BD5A2EE-859F-40FC-BDAC-167AAE37C870\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.13.6\",\"matchCriteriaId\":\"512C22FC-1524-4E6F-9E62-4F4B7B6E0576\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"71268287-21A8-4488-AA4F-23C473153131\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"23B9E5C6-FAB5-4A02-9E39-27C8787B0991\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/071729150be9e1d1b851b70efb6d91ee9269d57b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/727d6a8b7ef3d25080fad228b2c4a1d4da5999c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a88414fb1117f2fe65fb88e45ba694e1d09d5024\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e4fdca366806f6bab374d1a95e626a10a3854b0c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/071729150be9e1d1b851b70efb6d91ee9269d57b\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/727d6a8b7ef3d25080fad228b2c4a1d4da5999c6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a88414fb1117f2fe65fb88e45ba694e1d09d5024\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e4fdca366806f6bab374d1a95e626a10a3854b0c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T10:27:24+00:00",
      "cve": "CVE-2021-47293",
      "id": "CVE-2021-47293",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:fixed": "146",
      "product_status:known_affected": "28",
      "product_status:known_not_affected": "182",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: act_skbmod: Skip non-Ethernet packets",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47293.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T02:39:34Z",
      "cve": "CVE-2021-47293",
      "id": "CVE-2021-47293",
      "initial_release_date": "2024-05-23T03:04:59Z",
      "product_status:known_affected": "582",
      "product_status:known_not_affected": "186",
      "product_status:recommended": "70",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47293",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47293.json",
      "version": "51"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"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\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:32:08.508Z\"}}, {\"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\": \"2024-05-28T19:25:52.567Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"net/sched: act_skbmod: Skip non-Ethernet packets\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"86da71b57383d40993cb90baafb3735cffe5d800\", \"lessThan\": \"e4fdca366806f6bab374d1a95e626a10a3854b0c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"86da71b57383d40993cb90baafb3735cffe5d800\", \"lessThan\": \"a88414fb1117f2fe65fb88e45ba694e1d09d5024\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"86da71b57383d40993cb90baafb3735cffe5d800\", \"lessThan\": \"071729150be9e1d1b851b70efb6d91ee9269d57b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"86da71b57383d40993cb90baafb3735cffe5d800\", \"lessThan\": \"34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"86da71b57383d40993cb90baafb3735cffe5d800\", \"lessThan\": \"727d6a8b7ef3d25080fad228b2c4a1d4da5999c6\", \"versionType\": \"git\"}], \"programFiles\": [\"net/sched/act_skbmod.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.9\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.9\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.199\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.136\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.54\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.13.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sched/act_skbmod.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.199\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.136\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.54\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13.6\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14\", \"versionStartIncluding\": \"4.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:08:02.072Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47293\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:08:02.072Z\", \"dateReserved\": \"2024-05-21T13:27:52.130Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:17.373Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Loading…

Detection rules are retrieved from Rulezet.

Loading…

Loading…

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


Loading…