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netfilter: nft_objref: validate objref and objrefmap expressions

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_objref: validate objref and objrefmap expressions Referencing a synproxy stateful object from OUTPUT hook causes kernel crash due to infinite recursive calls: BUG: TASK stack guard page was hit at 000000008bda5b8c (stack is 000000003ab1c4a5..00000000494d8b12) [...] Call Trace: __find_rr_leaf+0x99/0x230 fib6_table_lookup+0x13b/0x2d0 ip6_pol_route+0xa4/0x400 fib6_rule_lookup+0x156/0x240 ip6_route_output_flags+0xc6/0x150 __nf_ip6_route+0x23/0x50 synproxy_send_tcp_ipv6+0x106/0x200 synproxy_send_client_synack_ipv6+0x1aa/0x1f0 nft_synproxy_do_eval+0x263/0x310 nft_do_chain+0x5a8/0x5f0 [nf_tables nft_do_chain_inet+0x98/0x110 nf_hook_slow+0x43/0xc0 __ip6_local_out+0xf0/0x170 ip6_local_out+0x17/0x70 synproxy_send_tcp_ipv6+0x1a2/0x200 synproxy_send_client_synack_ipv6+0x1aa/0x1f0 [...] Implement objref and objrefmap expression validate functions. Currently, only NFT_OBJECT_SYNPROXY object type requires validation. This will also handle a jump to a chain using a synproxy object from the OUTPUT hook. Now when trying to reference a synproxy object in the OUTPUT hook, nft will produce the following error: synproxy_crash.nft: Error: Could not process rule: Operation not supported synproxy name mysynproxy ^^^^^^^^^^^^^^^^^^^^^^^^

Announced Source revision 1
Original source ↗

CVE-2025-40206

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-2025-40206

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": "ee394f96ad7517fbc0de9106dcc7ce9efb14f264",
        "lessThan": "f31bcea12222a26d6f151df9c4a6d21f2eec1724",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ee394f96ad7517fbc0de9106dcc7ce9efb14f264",
        "lessThan": "0028e0134c64d9ed21728341a74fcfc59cd0f944",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ee394f96ad7517fbc0de9106dcc7ce9efb14f264",
        "lessThan": "7ea55a44493a5a36c3b3293b88bbe4841f9dbaf0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ee394f96ad7517fbc0de9106dcc7ce9efb14f264",
        "lessThan": "4c1cf72ec10be5a9ad264650cadffa1fbce6fabd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ee394f96ad7517fbc0de9106dcc7ce9efb14f264",
        "lessThan": "f359b809d54c6e3dd1d039b97e0b68390b0e53e4",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_objref.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.4"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.4",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.184",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.113",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.54",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.17.4",
        "versionType": "semver",
        "lessThanOrEqual": "6.17.*"
      },
      {
        "status": "unaffected",
        "version": "6.18",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_objref.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-40206

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30695 · Revision 1
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Publisher date
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