CVE-2022-49975 (GCVE-0-2022-49975)
Vulnerability from cvelistv5
Published
2025-06-18 11:00
Modified
2025-06-18 11:00
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Don't redirect packets with invalid pkt_len Syzbot found an issue [1]: fq_codel_drop() try to drop a flow whitout any skbs, that is, the flow->head is null. The root cause, as the [2] says, is because that bpf_prog_test_run_skb() run a bpf prog which redirects empty skbs. So we should determine whether the length of the packet modified by bpf prog or others like bpf_prog_test is valid before forwarding it directly.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/skbuff.h",
            "net/bpf/test_run.c",
            "net/core/dev.c"
          ],
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          "programFiles": [
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            "net/bpf/test_run.c",
            "net/core/dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "5.4.212",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.141",
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              "version": "5.19.7",
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              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Don\u0027t redirect packets with invalid pkt_len\n\nSyzbot found an issue [1]: fq_codel_drop() try to drop a flow whitout any\nskbs, that is, the flow-\u003ehead is null.\nThe root cause, as the [2] says, is because that bpf_prog_test_run_skb()\nrun a bpf prog which redirects empty skbs.\nSo we should determine whether the length of the packet modified by bpf\nprog or others like bpf_prog_test is valid before forwarding it directly."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:00:38.157Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8b68e53d56697a59b5c53893b53f508bbdf272a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/6204bf78b2a903b96ba43afff6abc0b04d6e0462"
        },
        {
          "url": "https://git.kernel.org/stable/c/a75987714bd2d8e59840667a28e15c1fa5c47554"
        },
        {
          "url": "https://git.kernel.org/stable/c/72f2dc8993f10262092745a88cb2dd0fef094f23"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd1894224407c484f652ad456e1ce423e89bb3eb"
        }
      ],
      "title": "bpf: Don\u0027t redirect packets with invalid pkt_len",
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49975",
    "datePublished": "2025-06-18T11:00:38.157Z",
    "dateReserved": "2025-06-18T10:57:27.385Z",
    "dateUpdated": "2025-06-18T11:00:38.157Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49975\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:24.893\",\"lastModified\":\"2025-06-18T13:46:52.973\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Don\u0027t redirect packets with invalid pkt_len\\n\\nSyzbot found an issue [1]: fq_codel_drop() try to drop a flow whitout any\\nskbs, that is, the flow-\u003ehead is null.\\nThe root cause, as the [2] says, is because that bpf_prog_test_run_skb()\\nrun a bpf prog which redirects empty skbs.\\nSo we should determine whether the length of the packet modified by bpf\\nprog or others like bpf_prog_test is valid before forwarding it directly.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: No redirigir paquetes con pkt_len no v\u00e1lidos. Syzbot encontr\u00f3 un problema [1]: fq_codel_drop() intenta descartar un flujo sin skbs, es decir, el flujo-\u0026gt;head es nulo. La causa principal, como se indica en [2], es que bpf_prog_test_run_skb() ejecuta un programa bpf que redirige skbs vac\u00edos. Por lo tanto, debemos determinar si la longitud del paquete modificado por el programa bpf u otros como bpf_prog_test es v\u00e1lida antes de reenviarlo directamente.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6204bf78b2a903b96ba43afff6abc0b04d6e0462\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/72f2dc8993f10262092745a88cb2dd0fef094f23\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8b68e53d56697a59b5c53893b53f508bbdf272a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a75987714bd2d8e59840667a28e15c1fa5c47554\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fd1894224407c484f652ad456e1ce423e89bb3eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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