{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"MEDIUM" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "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.", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23111" }, { "summary":"CVE-2026-23111 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-23111.json" }, { "summary":"openEuler-SA-2026-1760", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1760" }, { "summary":"CVE-2026-23111", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-23111&packageName=kernel" } ], "title":"openEuler cve CVE-2026-23111", "tracking":{ "initial_release_date":"2026-03-30T15:49:29+08:00", "revision_history":[ { "date":"2026-03-30T15:49:29+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-03-30T15:49:29+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-03-30T15:49:29+08:00", "id":"CVE-2026-23111", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS-SP1" }, "product_id":"openEuler-24.03-LTS-SP1", "name":"openEuler-24.03-LTS-SP1" }, "name":"openEuler-24.03-LTS-SP1", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ 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}, "vulnerabilities":[ { "cve":"CVE-2026-23111", "notes":[ { "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.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":{ "$ref":"$.vulnerabilities[0].product_status.fixed" } }, "remediations":[ { "product_ids":{ "$ref":"$.vulnerabilities[0].product_status.fixed" }, "details":"kernel security update", "category":"vendor_fix", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1760" } ], "scores":[ { "cvss_v3":{ "baseSeverity":"HIGH", "baseScore":7.8, "vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version":"3.1" }, "products":{ "$ref":"$.vulnerabilities[0].product_status.fixed" } } ], "threats":[ { "details":"High", "category":"impact" } ], "title":"CVE-2026-23111" } ] }