FKIE_CVE-2026-98484

Vulnerability from fkie_nvd - Published: 2026-10-18 16:16 - Updated: 2026-10-30 13:21
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/12cf803edfffef96f6415f0b5dbc7ec88842ea0f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2462ff0861f0dd5b2abdc3e95c3360d8566ab081
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2f07da3881525f7cbfed1ced2796c71a201505b9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4fb8b1ccc475651e480e509de126bb9ce7f3cff9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5e20b39aa7844769a7a782484bc1a809ffbc513e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70194dc37670bd08e44b471389861cc01bd3a3c9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f347d71d0d1a2157d8ecadbe1fba69cff32fce98
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_tables_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2462ff0861f0dd5b2abdc3e95c3360d8566ab081",
              "status": "affected",
              "version": "aaa31047a6d25da0fa101da1ed544e1247949b40",
              "versionType": "git"
            },
            {
              "lessThan": "f347d71d0d1a2157d8ecadbe1fba69cff32fce98",
              "status": "affected",
              "version": "aaa31047a6d25da0fa101da1ed544e1247949b40",
              "versionType": "git"
            },
            {
              "lessThan": "5e20b39aa7844769a7a782484bc1a809ffbc513e",
              "status": "affected",
              "version": "aaa31047a6d25da0fa101da1ed544e1247949b40",
              "versionType": "git"
            },
            {
              "lessThan": "2f07da3881525f7cbfed1ced2796c71a201505b9",
              "status": "affected",
              "version": "aaa31047a6d25da0fa101da1ed544e1247949b40",
              "versionType": "git"
            },
            {
              "lessThan": "12cf803edfffef96f6415f0b5dbc7ec88842ea0f",
              "status": "affected",
              "version": "aaa31047a6d25da0fa101da1ed544e1247949b40",
              "versionType": "git"
            },
            {
              "lessThan": "4fb8b1ccc475651e480e509de126bb9ce7f3cff9",
              "status": "affected",
              "version": "aaa31047a6d25da0fa101da1ed544e1247949b40",
              "versionType": "git"
            },
            {
              "lessThan": "70194dc37670bd08e44b471389861cc01bd3a3c9",
              "status": "affected",
              "version": "aaa31047a6d25da0fa101da1ed544e1247949b40",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_tables_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-98484",
  "lastModified": "2026-10-30T13:21:14.680",
  "metrics": {},
  "published": "2026-10-18T16:16:59.077",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/12cf803edfffef96f6415f0b5dbc7ec88842ea0f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2462ff0861f0dd5b2abdc3e95c3360d8566ab081"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2f07da3881525f7cbfed1ced2796c71a201505b9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4fb8b1ccc475651e480e509de126bb9ce7f3cff9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5e20b39aa7844769a7a782484bc1a809ffbc513e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/70194dc37670bd08e44b471389861cc01bd3a3c9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f347d71d0d1a2157d8ecadbe1fba69cff32fce98"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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