CVE-2026-98484 (GCVE-0-2026-98484)
Vulnerability from cvelistv5
Published
2026-10-18 15:15
Modified
2026-10-30 12:38
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: skip expired catchall elements on insert and delete nft_setelem_catchall_insert() looks up duplicates with nft_set_elem_active() only, while nft_set_catchall_lookup() and the dump path additionally skip expired elements. Once a catchall element with a timeout expires, this predicate drift makes it invisible to userspace dumps, yet it still blocks re-insertion: with NLM_F_EXCL the request fails with -EEXIST, and without it the request reports success but silently inserts nothing. The stale entry only goes away when the (user-tunable) gc interval elapses, so the catchall rule may silently stop matching for an arbitrarily long time after its first expiration. The delete path shows the same drift: nft_setelem_catchall_deactivate() picks the first active-next entry in the catchall list, so with an expired entry still pending GC it retires the stale entry instead of the fresh one, and it deactivates an element that userspace no longer sees instead of failing with -ENOENT. Align both walks with the lookup and dump predicates: only an element that is active and not expired counts as a duplicate or delete candidate, using the per-netns timestamp taken at transaction start, in line with the set backend .insert/.deactivate and catchall GC sync paths.
References
Impacted products
Vendor Product Version
Linux Linux Version: aaa31047a6d25da0fa101da1ed544e1247949b40
Version: aaa31047a6d25da0fa101da1ed544e1247949b40
Version: aaa31047a6d25da0fa101da1ed544e1247949b40
Version: aaa31047a6d25da0fa101da1ed544e1247949b40
Version: aaa31047a6d25da0fa101da1ed544e1247949b40
Version: aaa31047a6d25da0fa101da1ed544e1247949b40
Version: aaa31047a6d25da0fa101da1ed544e1247949b40
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{
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          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: skip expired catchall elements on insert and delete\n\nnft_setelem_catchall_insert() looks up duplicates with\nnft_set_elem_active() only, while nft_set_catchall_lookup() and the\ndump path additionally skip expired elements.\n\nOnce a catchall element with a timeout expires, this predicate drift\nmakes it invisible to userspace dumps, yet it still blocks\nre-insertion: with NLM_F_EXCL the request fails with -EEXIST, and\nwithout it the request reports success but silently inserts nothing.\nThe stale entry only goes away when the (user-tunable) gc interval\nelapses, so the catchall rule may silently stop matching for an\narbitrarily long time after its first expiration.\n\nThe delete path shows the same drift: nft_setelem_catchall_deactivate()\npicks the first active-next entry in the catchall list, so with an\nexpired entry still pending GC it retires the stale entry instead of\nthe fresh one, and it deactivates an element that userspace no longer\nsees instead of failing with -ENOENT.\n\nAlign both walks with the lookup and dump predicates: only an element\nthat is active and not expired counts as a duplicate or delete\ncandidate, using the per-netns timestamp taken at transaction start,\nin line with the set backend .insert/.deactivate and catchall GC sync\npaths."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:38:15.332Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2462ff0861f0dd5b2abdc3e95c3360d8566ab081"
        },
        {
          "url": "https://git.kernel.org/stable/c/f347d71d0d1a2157d8ecadbe1fba69cff32fce98"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e20b39aa7844769a7a782484bc1a809ffbc513e"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f07da3881525f7cbfed1ced2796c71a201505b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/12cf803edfffef96f6415f0b5dbc7ec88842ea0f"
        },
        {
          "url": "https://git.kernel.org/stable/c/4fb8b1ccc475651e480e509de126bb9ce7f3cff9"
        },
        {
          "url": "https://git.kernel.org/stable/c/70194dc37670bd08e44b471389861cc01bd3a3c9"
        }
      ],
      "title": "netfilter: nf_tables: skip expired catchall elements on insert and delete",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98484",
    "datePublished": "2026-10-18T15:15:58.118Z",
    "dateReserved": "2026-09-25T10:25:14.352Z",
    "dateUpdated": "2026-10-30T12:38:15.332Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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