FKIE_CVE-2026-74695

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-30 13:20
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_flow_table: drop existing skb dst before skb_dst_set_noref() Incoming skbs passing through netfilter flowtable offload hooks (or XFRM offload path) might already carry a ref-counted dst_entry assigned during earlier RX or routing steps. Calling skb_dst_set_noref() when skb already holds a ref-counted dst overwrites skb->_skb_refdst, leaking the previous dst_entry reference count and triggering a DEBUG_NET_WARN_ON_ONCE assertion in skb_dst_check_unset(): WARNING: at skb_dst_check_unset include/linux/skbuff.h:1170 WARNING: at skb_dst_set_noref include/linux/skbuff.h:1234 WARNING: at nf_flow_offload_ip_hook+0xf6c/0x2b60 net/netfilter/nf_flow_table_ip.c:864 Drop any existing dst_entry reference with skb_dst_drop(skb) before setting the non-referenced flowtable destination.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/12afa450a6a6c0cce2c42b7545a9958f62d8a00c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/274f544a32c08638ee887f2e27e3235b6b1237d4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4db3b48a966ed479b99cc8319ea9e46d4f7c703b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/538e67e8c7889cf5f93951f5309d1bcb41f86036
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/763f59b72ddaf18d0750d53083a74355f6c003c8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8aecf0bbcc72605592134c917c222207d8f63ab0
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_flow_table_ip.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "763f59b72ddaf18d0750d53083a74355f6c003c8",
              "status": "affected",
              "version": "2a79fd3908acd88e6cb0e620c314d7b1fee56a02",
              "versionType": "git"
            },
            {
              "lessThan": "4db3b48a966ed479b99cc8319ea9e46d4f7c703b",
              "status": "affected",
              "version": "2a79fd3908acd88e6cb0e620c314d7b1fee56a02",
              "versionType": "git"
            },
            {
              "lessThan": "274f544a32c08638ee887f2e27e3235b6b1237d4",
              "status": "affected",
              "version": "2a79fd3908acd88e6cb0e620c314d7b1fee56a02",
              "versionType": "git"
            },
            {
              "lessThan": "12afa450a6a6c0cce2c42b7545a9958f62d8a00c",
              "status": "affected",
              "version": "2a79fd3908acd88e6cb0e620c314d7b1fee56a02",
              "versionType": "git"
            },
            {
              "lessThan": "538e67e8c7889cf5f93951f5309d1bcb41f86036",
              "status": "affected",
              "version": "2a79fd3908acd88e6cb0e620c314d7b1fee56a02",
              "versionType": "git"
            },
            {
              "lessThan": "8aecf0bbcc72605592134c917c222207d8f63ab0",
              "status": "affected",
              "version": "2a79fd3908acd88e6cb0e620c314d7b1fee56a02",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b4b1adf2e66ecc7125c4117e7aad9ff61e2cfd27",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "209dedf806d31095968f54323dbe62525b077b33",
              "versionType": "git"
            },
            {
              "lessThan": "4.17",
              "status": "affected",
              "version": "4.16.15",
              "versionType": "semver"
            },
            {
              "lessThan": "4.18",
              "status": "affected",
              "version": "4.17.1",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_flow_table_ip.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.18"
            },
            {
              "lessThan": "4.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_flow_table: drop existing skb dst before skb_dst_set_noref()\n\nIncoming skbs passing through netfilter flowtable offload hooks (or XFRM\noffload path) might already carry a ref-counted dst_entry assigned during\nearlier RX or routing steps.\n\nCalling skb_dst_set_noref() when skb already holds a ref-counted dst\noverwrites skb-\u003e_skb_refdst, leaking the previous dst_entry reference\ncount and triggering a DEBUG_NET_WARN_ON_ONCE assertion in\nskb_dst_check_unset():\n\n  WARNING: at skb_dst_check_unset include/linux/skbuff.h:1170\n  WARNING: at skb_dst_set_noref include/linux/skbuff.h:1234\n  WARNING: at nf_flow_offload_ip_hook+0xf6c/0x2b60 net/netfilter/nf_flow_table_ip.c:864\n\nDrop any existing dst_entry reference with skb_dst_drop(skb) before\nsetting the non-referenced flowtable destination."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: nf_flow_table: descartar el dst de skb existente antes de skb_dst_set_noref()\n\nLos skbs entrantes que pasan por los hooks de descarga de la tabla de flujos de netfilter (o la ruta de descarga de XFRM) podr\u00edan ya llevar un dst_entry con contador de referencias asignado durante pasos anteriores de RX o enrutamiento.\n\nLlamar a skb_dst_set_noref() cuando el skb ya contiene un dst con contador de referencias sobrescribe skb -\u003e _skb_refdst, filtrando el contador de referencias del dst_entry anterior y disparando una aserci\u00f3n DEBUG_NET_WARN_ON_ONCE en skb_dst_check_unset():\n\n  ADVERTENCIA: en skb_dst_check_unset include/linux/skbuff.h:1170\n  ADVERTENCIA: en skb_dst_set_noref include/linux/skbuff.h:1234\n  ADVERTENCIA: en nf_flow_offload_ip_hook+0xf6c/0x2b60 net/netfilter/nf_flow_table_ip.c:864\n\nDescartar cualquier referencia de dst_entry existente con skb_dst_drop(skb) antes de establecer el destino de la tabla de flujos sin referencias."
    }
  ],
  "id": "CVE-2026-74695",
  "lastModified": "2026-10-30T13:20:04.100",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-74695",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-16T19:14:42.839344Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-22T16:16:44.050",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/12afa450a6a6c0cce2c42b7545a9958f62d8a00c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/274f544a32c08638ee887f2e27e3235b6b1237d4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4db3b48a966ed479b99cc8319ea9e46d4f7c703b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/538e67e8c7889cf5f93951f5309d1bcb41f86036"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/763f59b72ddaf18d0750d53083a74355f6c003c8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8aecf0bbcc72605592134c917c222207d8f63ab0"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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