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netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate() nft_map_catchall_activate() has an inverted element activity check compared to its non-catchall counterpart nft_mapelem_activate() and compared to what is logically required. nft_map_catchall_activate() is called from the abort path to re-activate catchall map elements that were deactivated during a failed transaction. It should skip elements that are already active (they don't need re-activation) and process elements that are inactive (they need to be restored). Instead, the current code does the opposite: it skips inactive elements and processes active ones. Compare the non-catchall activate callback, which is correct: nft_mapelem_activate(): if (nft_set_elem_active(ext, iter->genmask)) return 0; /* skip active, process inactive */ With the buggy catchall version: nft_map_catchall_activate(): if (!nft_set_elem_active(ext, genmask)) continue; /* skip inactive, process active */ The consequence is that when a DELSET operation is aborted, nft_setelem_data_activate() is never called for the catchall element. For NFT_GOTO verdict elements, this means nft_data_hold() is never called to restore the chain->use reference count. Each abort cycle permanently decrements chain->use. Once chain->use reaches zero, DELCHAIN succeeds and frees the chain while catchall verdict elements still reference it, resulting in a use-after-free. This is ex

Products
Kernel
Affected versions
Not specified
Fixed versions
5.15.200, 6.1.163, 6.12.70, 6.18.10, 6.6.124
CVEs
CVE-2026-23111
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 17:36 UTC · Revision 1

Source evidence

netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()

core-osv · Original source

Published 13 Feb 2026, 13:29 UTC

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate() nft_map_catchall_activate() has an inverted element activity check compared to its non-catchall counterpart nft_mapelem_activate() and compared to what is logically required. nft_map_catchall_activate() is called from the abort path to re-activate catchall map elements that were deactivated during a failed transaction. It should skip elements that are already active (they don't need re-activation) and process elements that are inactive (they need to be restored). Instead, the current code does the opposite: it skips inactive elements and processes active ones. Compare the non-catchall activate callback, which is correct: nft_mapelem_activate(): if (nft_set_elem_active(ext, iter->genmask)) return 0; /* skip active, process inactive */ With the buggy catchall version: nft_map_catchall_activate(): if (!nft_set_elem_active(ext, genmask)) continue; /* skip inactive, process active */ The consequence is that when a DELSET operation is aborted, nft_setelem_data_activate() is never called for the catchall element. For NFT_GOTO verdict elements, this means nft_data_hold() is never called to restore the chain->use reference count. Each abort cycle permanently decrements chain->use. Once chain->use reaches zero, DELCHAIN succeeds and frees the chain while catchall verdict elements still reference it, resulting in a use-after-free. This is ex

osv:CVE-2026-23111

Kernel

Fixed versions: 5.15.200, 6.1.163, 6.6.124, 6.12.70, 6.18.10

Complete source record
{
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  "url": "https://osv.dev/vulnerability/CVE-2026-23111",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate() nft_map_catchall_activate() has an inverted element activity check compared to its non-catchall counterpart nft_mapelem_activate() and compared to what is logically required. nft_map_catchall_activate() is called from the abort path to re-activate catchall map elements that were deactivated during a failed transaction. It should skip elements that are already active (they don't need re-activation) and process elements that are inactive (they need to be restored). Instead, the current code does the opposite: it skips inactive elements and processes active ones. Compare the non-catchall activate callback, which is correct: nft_mapelem_activate(): if (nft_set_elem_active(ext, iter->genmask)) return 0; /* skip active, process inactive */ With the buggy catchall version: nft_map_catchall_activate(): if (!nft_set_elem_active(ext, genmask)) continue; /* skip inactive, process active */ The consequence is that when a DELSET operation is aborted, nft_setelem_data_activate() is never called for the catchall element. For NFT_GOTO verdict elements, this means nft_data_hold() is never called to restore the chain->use reference count. Each abort cycle permanently decrements chain->use. Once chain->use reaches zero, DELCHAIN succeeds and frees the chain while catchall verdict elements still reference it, resulting in a use-after-free. This is ex",
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        "https://git.kernel.org/stable/c/8b68a45f9722f2babe9e7bad00aa74638addf081",
        "https://git.kernel.org/stable/c/8c760ba4e36c750379d13569f23f5a6e185333f5",
        "https://git.kernel.org/stable/c/b9b6573421de51829f7ec1cce76d85f5f6fbbd7f",
        "https://git.kernel.org/stable/c/f41c5d151078c5348271ffaf8e7410d96f2d82f8",
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23111.json",
        "https://access.redhat.com/errata/RHSA-2026:10108",
        "https://access.redhat.com/errata/RHSA-2026:10996",
        "https://access.redhat.com/errata/RHSA-2026:18134",
        "https://access.redhat.com/errata/RHSA-2026:62639",
        "https://access.redhat.com/errata/RHSA-2026:62641",
        "https://access.redhat.com/errata/RHSA-2026:6570",
        "https://access.redhat.com/errata/RHSA-2026:9112",
        "https://access.redhat.com/security/cve/CVE-2026-23111",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23111.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23111",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2439687",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
        "https://blog.exodusintel.com/2026/06/08/off-by-exploiting-a-use-after-free-in-the-linux-kernel/"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23111.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23111",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497881,
  "published_at": "2026-02-13T13:29:55.895+00:00"
}