CVE-2025-38732 (GCVE-0-2025-38732)
Vulnerability from cvelistv5
Published
2025-09-05 17:20
Modified
2025-09-29 05:56
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_reject: don't leak dst refcount for loopback packets recent patches to add a WARN() when replacing skb dst entry found an old bug: WARNING: include/linux/skbuff.h:1165 skb_dst_check_unset include/linux/skbuff.h:1164 [inline] WARNING: include/linux/skbuff.h:1165 skb_dst_set include/linux/skbuff.h:1210 [inline] WARNING: include/linux/skbuff.h:1165 nf_reject_fill_skb_dst+0x2a4/0x330 net/ipv4/netfilter/nf_reject_ipv4.c:234 [..] Call Trace: nf_send_unreach+0x17b/0x6e0 net/ipv4/netfilter/nf_reject_ipv4.c:325 nft_reject_inet_eval+0x4bc/0x690 net/netfilter/nft_reject_inet.c:27 expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline] .. This is because blamed commit forgot about loopback packets. Such packets already have a dst_entry attached, even at PRE_ROUTING stage. Instead of checking hook just check if the skb already has a route attached to it.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/51e8531371f90bee742c63775c9a568e5d6bf3c5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7b8b503c06274ef3c6c1a107743f1ec0d0a53ef8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/82ef97abf22790182f7d433c74960dfd61b99c33
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/91a79b792204313153e1bdbbe5acbfc28903b3a5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a0a3ace2a57887dac1e7c9a724846040c3e31868
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b32e1590a8d22cf7d7f965e46d5576051acf8e42
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b7a885ba25960c91db237c3f83b4285156789bce
Impacted products
Vendor Product Version
Linux Linux Version: f53b9b0bdc59c0823679f2e3214e0d538f5951b9
Version: f53b9b0bdc59c0823679f2e3214e0d538f5951b9
Version: f53b9b0bdc59c0823679f2e3214e0d538f5951b9
Version: f53b9b0bdc59c0823679f2e3214e0d538f5951b9
Version: f53b9b0bdc59c0823679f2e3214e0d538f5951b9
Version: f53b9b0bdc59c0823679f2e3214e0d538f5951b9
Version: f53b9b0bdc59c0823679f2e3214e0d538f5951b9
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   Linux Linux Version: 5.9
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/netfilter/nf_reject_ipv4.c",
            "net/ipv6/netfilter/nf_reject_ipv6.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "f53b9b0bdc59c0823679f2e3214e0d538f5951b9",
              "versionType": "git"
            },
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "f53b9b0bdc59c0823679f2e3214e0d538f5951b9",
              "versionType": "git"
            },
            {
              "lessThan": "a0a3ace2a57887dac1e7c9a724846040c3e31868",
              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "f53b9b0bdc59c0823679f2e3214e0d538f5951b9",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/netfilter/nf_reject_ipv4.c",
            "net/ipv6/netfilter/nf_reject_ipv6.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.9"
            },
            {
              "lessThan": "5.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.241",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.190",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.149",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.241",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.190",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.149",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.103",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.44",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.4",
                  "versionStartIncluding": "5.9",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_reject: don\u0027t leak dst refcount for loopback packets\n\nrecent patches to add a WARN() when replacing skb dst entry found an\nold bug:\n\nWARNING: include/linux/skbuff.h:1165 skb_dst_check_unset include/linux/skbuff.h:1164 [inline]\nWARNING: include/linux/skbuff.h:1165 skb_dst_set include/linux/skbuff.h:1210 [inline]\nWARNING: include/linux/skbuff.h:1165 nf_reject_fill_skb_dst+0x2a4/0x330 net/ipv4/netfilter/nf_reject_ipv4.c:234\n[..]\nCall Trace:\n nf_send_unreach+0x17b/0x6e0 net/ipv4/netfilter/nf_reject_ipv4.c:325\n nft_reject_inet_eval+0x4bc/0x690 net/netfilter/nft_reject_inet.c:27\n expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]\n ..\n\nThis is because blamed commit forgot about loopback packets.\nSuch packets already have a dst_entry attached, even at PRE_ROUTING stage.\n\nInstead of checking hook just check if the skb already has a route\nattached to it."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:56:59.879Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7b8b503c06274ef3c6c1a107743f1ec0d0a53ef8"
        },
        {
          "url": "https://git.kernel.org/stable/c/82ef97abf22790182f7d433c74960dfd61b99c33"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7a885ba25960c91db237c3f83b4285156789bce"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0a3ace2a57887dac1e7c9a724846040c3e31868"
        },
        {
          "url": "https://git.kernel.org/stable/c/51e8531371f90bee742c63775c9a568e5d6bf3c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/b32e1590a8d22cf7d7f965e46d5576051acf8e42"
        },
        {
          "url": "https://git.kernel.org/stable/c/91a79b792204313153e1bdbbe5acbfc28903b3a5"
        }
      ],
      "title": "netfilter: nf_reject: don\u0027t leak dst refcount for loopback packets",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38732",
    "datePublished": "2025-09-05T17:20:31.934Z",
    "dateReserved": "2025-04-16T04:51:24.033Z",
    "dateUpdated": "2025-09-29T05:56:59.879Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38732\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-05T18:15:42.407\",\"lastModified\":\"2025-09-08T16:25:59.157\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: nf_reject: don\u0027t leak dst refcount for loopback packets\\n\\nrecent patches to add a WARN() when replacing skb dst entry found an\\nold bug:\\n\\nWARNING: include/linux/skbuff.h:1165 skb_dst_check_unset include/linux/skbuff.h:1164 [inline]\\nWARNING: include/linux/skbuff.h:1165 skb_dst_set include/linux/skbuff.h:1210 [inline]\\nWARNING: include/linux/skbuff.h:1165 nf_reject_fill_skb_dst+0x2a4/0x330 net/ipv4/netfilter/nf_reject_ipv4.c:234\\n[..]\\nCall Trace:\\n nf_send_unreach+0x17b/0x6e0 net/ipv4/netfilter/nf_reject_ipv4.c:325\\n nft_reject_inet_eval+0x4bc/0x690 net/netfilter/nft_reject_inet.c:27\\n expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]\\n ..\\n\\nThis is because blamed commit forgot about loopback packets.\\nSuch packets already have a dst_entry attached, even at PRE_ROUTING stage.\\n\\nInstead of checking hook just check if the skb already has a route\\nattached to it.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/51e8531371f90bee742c63775c9a568e5d6bf3c5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7b8b503c06274ef3c6c1a107743f1ec0d0a53ef8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/82ef97abf22790182f7d433c74960dfd61b99c33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/91a79b792204313153e1bdbbe5acbfc28903b3a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a0a3ace2a57887dac1e7c9a724846040c3e31868\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b32e1590a8d22cf7d7f965e46d5576051acf8e42\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7a885ba25960c91db237c3f83b4285156789bce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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