CVE-2025-68363 (GCVE-0-2025-68363)
Vulnerability from cvelistv5
Published
2025-12-24 10:32
Modified
2025-12-24 10:32
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Check skb->transport_header is set in bpf_skb_check_mtu The bpf_skb_check_mtu helper needs to use skb->transport_header when the BPF_MTU_CHK_SEGS flag is used: bpf_skb_check_mtu(skb, ifindex, &mtu_len, 0, BPF_MTU_CHK_SEGS) The transport_header is not always set. There is a WARN_ON_ONCE report when CONFIG_DEBUG_NET is enabled + skb->gso_size is set + bpf_prog_test_run is used: WARNING: CPU: 1 PID: 2216 at ./include/linux/skbuff.h:3071 skb_gso_validate_network_len bpf_skb_check_mtu bpf_prog_3920e25740a41171_tc_chk_segs_flag # A test in the next patch bpf_test_run bpf_prog_test_run_skb For a normal ingress skb (not test_run), skb_reset_transport_header is performed but there is plan to avoid setting it as described in commit 2170a1f09148 ("net: no longer reset transport_header in __netif_receive_skb_core()"). This patch fixes the bpf helper by checking skb_transport_header_was_set(). The check is done just before skb->transport_header is used, to avoid breaking the existing bpf prog. The WARN_ON_ONCE is limited to bpf_prog_test_run, so targeting bpf-next.
References
Impacted products
Vendor Product Version
Linux Linux Version: 34b2021cc61642d61c3cf943d9e71925b827941b
Version: 34b2021cc61642d61c3cf943d9e71925b827941b
Version: 34b2021cc61642d61c3cf943d9e71925b827941b
Version: 34b2021cc61642d61c3cf943d9e71925b827941b
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/filter.c"
          ],
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          "versions": [
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          "vendor": "Linux",
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              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.63",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc1",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
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          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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                {
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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: Check skb-\u003etransport_header is set in bpf_skb_check_mtu\n\nThe bpf_skb_check_mtu helper needs to use skb-\u003etransport_header when\nthe BPF_MTU_CHK_SEGS flag is used:\n\n\tbpf_skb_check_mtu(skb, ifindex, \u0026mtu_len, 0, BPF_MTU_CHK_SEGS)\n\nThe transport_header is not always set. There is a WARN_ON_ONCE\nreport when CONFIG_DEBUG_NET is enabled + skb-\u003egso_size is set +\nbpf_prog_test_run is used:\n\nWARNING: CPU: 1 PID: 2216 at ./include/linux/skbuff.h:3071\n skb_gso_validate_network_len\n bpf_skb_check_mtu\n bpf_prog_3920e25740a41171_tc_chk_segs_flag # A test in the next patch\n bpf_test_run\n bpf_prog_test_run_skb\n\nFor a normal ingress skb (not test_run), skb_reset_transport_header\nis performed but there is plan to avoid setting it as described in\ncommit 2170a1f09148 (\"net: no longer reset transport_header in __netif_receive_skb_core()\").\n\nThis patch fixes the bpf helper by checking\nskb_transport_header_was_set(). The check is done just before\nskb-\u003etransport_header is used, to avoid breaking the existing bpf prog.\nThe WARN_ON_ONCE is limited to bpf_prog_test_run, so targeting bpf-next."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T10:32:51.236Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/30ce906557a21adef4cba5901c8e995dc18263a9"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c30e4afc5507f0069cc09bd561e510e4d97fbf7"
        },
        {
          "url": "https://git.kernel.org/stable/c/942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5"
        },
        {
          "url": "https://git.kernel.org/stable/c/d946f3c98328171fa50ddb908593cf833587f725"
        }
      ],
      "title": "bpf: Check skb-\u003etransport_header is set in bpf_skb_check_mtu",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68363",
    "datePublished": "2025-12-24T10:32:51.236Z",
    "dateReserved": "2025-12-16T14:48:05.308Z",
    "dateUpdated": "2025-12-24T10:32:51.236Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68363\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T11:15:59.720\",\"lastModified\":\"2025-12-24T11:15:59.720\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Check skb-\u003etransport_header is set in bpf_skb_check_mtu\\n\\nThe bpf_skb_check_mtu helper needs to use skb-\u003etransport_header when\\nthe BPF_MTU_CHK_SEGS flag is used:\\n\\n\\tbpf_skb_check_mtu(skb, ifindex, \u0026mtu_len, 0, BPF_MTU_CHK_SEGS)\\n\\nThe transport_header is not always set. There is a WARN_ON_ONCE\\nreport when CONFIG_DEBUG_NET is enabled + skb-\u003egso_size is set +\\nbpf_prog_test_run is used:\\n\\nWARNING: CPU: 1 PID: 2216 at ./include/linux/skbuff.h:3071\\n skb_gso_validate_network_len\\n bpf_skb_check_mtu\\n bpf_prog_3920e25740a41171_tc_chk_segs_flag # A test in the next patch\\n bpf_test_run\\n bpf_prog_test_run_skb\\n\\nFor a normal ingress skb (not test_run), skb_reset_transport_header\\nis performed but there is plan to avoid setting it as described in\\ncommit 2170a1f09148 (\\\"net: no longer reset transport_header in __netif_receive_skb_core()\\\").\\n\\nThis patch fixes the bpf helper by checking\\nskb_transport_header_was_set(). The check is done just before\\nskb-\u003etransport_header is used, to avoid breaking the existing bpf prog.\\nThe WARN_ON_ONCE is limited to bpf_prog_test_run, so targeting bpf-next.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1c30e4afc5507f0069cc09bd561e510e4d97fbf7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/30ce906557a21adef4cba5901c8e995dc18263a9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d946f3c98328171fa50ddb908593cf833587f725\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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