CVE-2023-52924 (GCVE-0-2023-52924)

Vulnerability from cvelistv5 – Published: 2025-02-05 09:07 – Updated: 2025-05-04 07:46
VLAI?
Title
netfilter: nf_tables: don't skip expired elements during walk
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: don't skip expired elements during walk There is an asymmetry between commit/abort and preparation phase if the following conditions are met: 1. set is a verdict map ("1.2.3.4 : jump foo") 2. timeouts are enabled In this case, following sequence is problematic: 1. element E in set S refers to chain C 2. userspace requests removal of set S 3. kernel does a set walk to decrement chain->use count for all elements from preparation phase 4. kernel does another set walk to remove elements from the commit phase (or another walk to do a chain->use increment for all elements from abort phase) If E has already expired in 1), it will be ignored during list walk, so its use count won't have been changed. Then, when set is culled, ->destroy callback will zap the element via nf_tables_set_elem_destroy(), but this function is only safe for elements that have been deactivated earlier from the preparation phase: lack of earlier deactivate removes the element but leaks the chain use count, which results in a WARN splat when the chain gets removed later, plus a leak of the nft_chain structure. Update pipapo_get() not to skip expired elements, otherwise flush command reports bogus ENOENT errors.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 , < 94313a196b44184b5b52c1876da6a537701b425a (git)
Affected: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 , < 1da4874d05da1526b11b82fc7f3c7ac38749ddf8 (git)
Affected: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 , < b15ea4017af82011dd55225ce77cce3d4dfc169c (git)
Affected: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 , < 7c7e658a36f8b1522bd3586d8137e5f93a25ddc5 (git)
Affected: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 , < 59dab3bf0b8fc08eb802721c0532f13dd89209b8 (git)
Affected: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 , < bd156ce9553dcaf2d6ee2c825d1a5a1718e86524 (git)
Affected: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 , < 24138933b97b055d486e8064b4a1721702442a9b (git)
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    Linux Linux Affected: 4.1
Unaffected: 0 , < 4.1 (semver)
Unaffected: 4.19.316 , ≤ 4.19.* (semver)
Unaffected: 5.4.262 , ≤ 5.4.* (semver)
Unaffected: 5.10.198 , ≤ 5.10.* (semver)
Unaffected: 5.15.134 , ≤ 5.15.* (semver)
Unaffected: 6.1.56 , ≤ 6.1.* (semver)
Unaffected: 6.4.11 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_tables_api.c",
            "net/netfilter/nft_set_hash.c",
            "net/netfilter/nft_set_pipapo.c",
            "net/netfilter/nft_set_rbtree.c"
          ],
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          "versions": [
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            },
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              "version": "0",
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            },
            {
              "lessThanOrEqual": "4.19.*",
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              "version": "4.19.316",
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            },
            {
              "lessThanOrEqual": "5.4.*",
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              "lessThanOrEqual": "5.10.*",
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              "lessThanOrEqual": "5.15.*",
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              "status": "unaffected",
              "version": "6.5",
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            }
          ]
        }
      ],
      "cpeApplicability": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: don\u0027t skip expired elements during walk\n\nThere is an asymmetry between commit/abort and preparation phase if the\nfollowing conditions are met:\n\n1. set is a verdict map (\"1.2.3.4 : jump foo\")\n2. timeouts are enabled\n\nIn this case, following sequence is problematic:\n\n1. element E in set S refers to chain C\n2. userspace requests removal of set S\n3. kernel does a set walk to decrement chain-\u003euse count for all elements\n   from preparation phase\n4. kernel does another set walk to remove elements from the commit phase\n   (or another walk to do a chain-\u003euse increment for all elements from\n    abort phase)\n\nIf E has already expired in 1), it will be ignored during list walk, so its use count\nwon\u0027t have been changed.\n\nThen, when set is culled, -\u003edestroy callback will zap the element via\nnf_tables_set_elem_destroy(), but this function is only safe for\nelements that have been deactivated earlier from the preparation phase:\nlack of earlier deactivate removes the element but leaks the chain use\ncount, which results in a WARN splat when the chain gets removed later,\nplus a leak of the nft_chain structure.\n\nUpdate pipapo_get() not to skip expired elements, otherwise flush\ncommand reports bogus ENOENT errors."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:46:06.745Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/94313a196b44184b5b52c1876da6a537701b425a"
        },
        {
          "url": "https://git.kernel.org/stable/c/1da4874d05da1526b11b82fc7f3c7ac38749ddf8"
        },
        {
          "url": "https://git.kernel.org/stable/c/b15ea4017af82011dd55225ce77cce3d4dfc169c"
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          "url": "https://git.kernel.org/stable/c/7c7e658a36f8b1522bd3586d8137e5f93a25ddc5"
        },
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          "url": "https://git.kernel.org/stable/c/59dab3bf0b8fc08eb802721c0532f13dd89209b8"
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          "url": "https://git.kernel.org/stable/c/bd156ce9553dcaf2d6ee2c825d1a5a1718e86524"
        },
        {
          "url": "https://git.kernel.org/stable/c/24138933b97b055d486e8064b4a1721702442a9b"
        }
      ],
      "title": "netfilter: nf_tables: don\u0027t skip expired elements during walk",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-52924",
    "datePublished": "2025-02-05T09:07:55.418Z",
    "dateReserved": "2024-08-21T06:07:11.018Z",
    "dateUpdated": "2025-05-04T07:46:06.745Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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