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netfilter: nf_reject: don't leak dst refcount for loopback packets

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2025-38732

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-38732

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "f53b9b0bdc59c0823679f2e3214e0d538f5951b9",
        "lessThan": "7b8b503c06274ef3c6c1a107743f1ec0d0a53ef8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f53b9b0bdc59c0823679f2e3214e0d538f5951b9",
        "lessThan": "82ef97abf22790182f7d433c74960dfd61b99c33",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f53b9b0bdc59c0823679f2e3214e0d538f5951b9",
        "lessThan": "b7a885ba25960c91db237c3f83b4285156789bce",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f53b9b0bdc59c0823679f2e3214e0d538f5951b9",
        "lessThan": "a0a3ace2a57887dac1e7c9a724846040c3e31868",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f53b9b0bdc59c0823679f2e3214e0d538f5951b9",
        "lessThan": "51e8531371f90bee742c63775c9a568e5d6bf3c5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f53b9b0bdc59c0823679f2e3214e0d538f5951b9",
        "lessThan": "b32e1590a8d22cf7d7f965e46d5576051acf8e42",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f53b9b0bdc59c0823679f2e3214e0d538f5951b9",
        "lessThan": "91a79b792204313153e1bdbbe5acbfc28903b3a5",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv4/netfilter/nf_reject_ipv4.c",
      "net/ipv6/netfilter/nf_reject_ipv6.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.9",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.241",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.190",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.149",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.16.4",
        "versionType": "semver",
        "lessThanOrEqual": "6.16.*"
      },
      {
        "status": "unaffected",
        "version": "6.17",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv4/netfilter/nf_reject_ipv4.c",
      "net/ipv6/netfilter/nf_reject_ipv6.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-38732

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#27055 · Revision 1
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