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        "name": "Use After Free"
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()\n\nnft_map_catchall_activate() has an inverted element activity check\ncompared to its non-catchall counterpart nft_mapelem_activate() and\ncompared to what is logically required.\n\nnft_map_catchall_activate() is called from the abort path to re-activate\ncatchall map elements that were deactivated during a failed transaction.\nIt should skip elements that are already active (they don't need\nre-activation) and process elements that are inactive (they need to be\nrestored). Instead, the current code does the opposite: it skips inactive\nelements and processes active ones.\n\nCompare the non-catchall activate callback, which is correct:\n\n  nft_mapelem_activate():\n    if (nft_set_elem_active(ext, iter->genmask))\n        return 0;   /* skip active, process inactive */\n\nWith the buggy catchall version:\n\n  nft_map_catchall_activate():\n    if (!nft_set_elem_active(ext, genmask))\n        continue;   /* skip inactive, process active */\n\nThe consequence is that when a DELSET operation is aborted,\nnft_setelem_data_activate() is never called for the catchall element.\nFor NFT_GOTO verdict elements, this means nft_data_hold() is never\ncalled to restore the chain->use reference count. Each abort cycle\npermanently decrements chain->use. Once chain->use reaches zero,\nDELCHAIN succeeds and frees the chain while catchall verdict elements\nstill reference it, resulting in a use-after-free.\n\nThis is exploitable for local privilege escalation from an unprivileged\nuser via user namespaces + nftables on distributions that enable\nCONFIG_USER_NS and CONFIG_NF_TABLES.\n\nFix by removing the negation so the check matches nft_mapelem_activate():\nskip active elements, process inactive ones.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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          "category": "external",
          "summary": "https://git.kernel.org/stable/c/8b68a45f9722f2babe9e7bad00aa74638addf081",
          "url": "https://git.kernel.org/stable/c/8b68a45f9722f2babe9e7bad00aa74638addf081"
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        {
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          "summary": "https://git.kernel.org/stable/c/8c760ba4e36c750379d13569f23f5a6e185333f5",
          "url": "https://git.kernel.org/stable/c/8c760ba4e36c750379d13569f23f5a6e185333f5"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/b9b6573421de51829f7ec1cce76d85f5f6fbbd7f",
          "url": "https://git.kernel.org/stable/c/b9b6573421de51829f7ec1cce76d85f5f6fbbd7f"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f41c5d151078c5348271ffaf8e7410d96f2d82f8",
          "url": "https://git.kernel.org/stable/c/f41c5d151078c5348271ffaf8e7410d96f2d82f8"
        }
      ],
      "release_date": "2026-02-13T14:16:00Z",
      "remediations": [
        {
          "category": "none_available",
          "details": "Affected",
          "product_ids": [
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          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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        {
          "category": "impact",
          "details": "Important"
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    }
  ]
}