CVE-2025-68363 (GCVE-0-2025-68363)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:32 – Updated: 2026-10-15 01:09
VLAI
Title
bpf: Check skb->transport_header is set in bpf_skb_check_mtu
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6847 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 34b2021cc61642d61c3cf943d9e71925b827941b , < b3171a5e4622e915e94599a55f4964078bdec27e (git)
Affected: 34b2021cc61642d61c3cf943d9e71925b827941b , < 97b876fa88322625228792cf7a5fd77531815a80 (git)
Affected: 34b2021cc61642d61c3cf943d9e71925b827941b , < 30ce906557a21adef4cba5901c8e995dc18263a9 (git)
Affected: 34b2021cc61642d61c3cf943d9e71925b827941b , < 1c30e4afc5507f0069cc09bd561e510e4d97fbf7 (git)
Affected: 34b2021cc61642d61c3cf943d9e71925b827941b , < 942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5 (git)
Affected: 34b2021cc61642d61c3cf943d9e71925b827941b , < d946f3c98328171fa50ddb908593cf833587f725 (git)
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Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.63 , ≤ 6.12.* (semver)
Unaffected: 6.17.13 , ≤ 6.17.* (semver)
Unaffected: 6.18.2 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
guessed Create a notification for this product.
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              {
                "defaultStatus": "unknown",
                "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.6",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.7",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
          }
        ],
        "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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbpf: Verificar que skb -\u003e transport_header est\u00e9 configurado en bpf_skb_check_mtu\n\nLa funci\u00f3n auxiliar bpf_skb_check_mtu necesita usar skb -\u003e transport_header cuando se usa la bandera BPF_MTU_CHK_SEGS:\n\n\tbpf_skb_check_mtu(skb, ifindex, \u0026mtu_len, 0, BPF_MTU_CHK_SEGS)\n\nEl transport_header no siempre est\u00e1 configurado. Hay un informe WARN_ON_ONCE cuando CONFIG_DEBUG_NET est\u00e1 habilitado + skb -\u003e gso_size est\u00e1 configurado + se usa bpf_prog_test_run:\n\nWARNING: CPU: 1 PID: 2216 en ./include/linux/skbuff.h:3071\n skb_gso_validate_network_len\n bpf_skb_check_mtu\n bpf_prog_3920e25740a41171_tc_chk_segs_flag # Una prueba en el siguiente parche\n bpf_test_run\n bpf_prog_test_run_skb\n\nPara un skb de entrada normal (no test_run), se realiza skb_reset_transport_header, pero hay un plan para evitar configurarlo como se describe en el commit 2170a1f09148 (\u0027net: ya no restablecer transport_header en __netif_receive_skb_core()\u0027).\n\nEste parche corrige la funci\u00f3n auxiliar bpf verificando skb_transport_header_was_set(). La verificaci\u00f3n se realiza justo antes de que se use skb -\u003e transport_header, para evitar romper el programa bpf existente. El WARN_ON_ONCE est\u00e1 limitado a bpf_prog_test_run, por lo que apunta a bpf-next."
          }
        ],
        "id": "CVE-2025-68363",
        "lastModified": "2026-10-15T02:18:12.150",
        "metrics": {},
        "published": "2025-12-24T11:15:59.720",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "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/97b876fa88322625228792cf7a5fd77531815a80"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b3171a5e4622e915e94599a55f4964078bdec27e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d946f3c98328171fa50ddb908593cf833587f725"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:18:12+00:00",
      "cve": "CVE-2025-68363",
      "id": "CVE-2025-68363",
      "initial_release_date": "2025-12-24T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Check skb-\u003etransport_header is set in bpf_skb_check_mtu",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68363.json",
      "version": "3"
    }
  }
}



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