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CVE-2026-23111: Linux, грешка в паметта

7.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

CVE радар: още уязвимости от този вид

  • Експлоатация: няма данни за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

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 exploitable for local privilege escalation from an unprivileged user via user namespaces + nftables on distributions that enable CONFIG_USER_NS and CONFIG_NF_TABLES. Fix by removing the negation so the check matches nft_mapelem_activate(): skip active elements, process inactive ones.

Засегнати продукти

  • Linux Linux: 25aa2ad37c2162be1c0bc4fe6397f7e4c13f00f8 преди 8c760ba4e36c750379d13569f23f5a6e185333f5; d60be2da67d172aecf866302c91ea11533eca4d9 преди b9b6573421de51829f7ec1cce76d85f5f6fbbd7f; 628bd3e49cba1c066228e23d71a852c23e26da73 преди 42c574c1504aa089a0a142e4c13859327570473d; 628bd3e49cba1c066228e23d71a852c23e26da73 преди 1444ff890b4653add12f734ffeffc173d42862dd; 628bd3e49cba1c066228e23d71a852c23e26da73 преди 8b68a45f9722f2babe9e7bad00aa74638addf081; 628bd3e49cba1c066228e23d71a852c23e26da73 преди f41c5d151078c5348271ffaf8e7410d96f2d82f8; bc9f791d2593f17e39f87c6e2b3a36549a3705b1; 3c7ec098e3b588434a8b07ea9b5b36f04cef1f50; a136b7942ad2a50de708f76ea299ccb45ac7a7f9; dc7cdf8cbcbf8b13de1df93f356ec04cdeef5c41; 5.15.121 преди 5.15.200; 6.1.36 преди 6.1.163; 4.19.316 преди 4.20; 5.4.262 преди 5.5; 5.10.188 преди 5.11; 6.3.10 преди 6.4
  • Linux Linux: 6.4; преди 6.4; 5.15.200 до 5.15.*; 6.1.163 до 6.1.*; 6.6.124 до 6.6.*; 6.12.70 до 6.12.*; 6.18.10 до 6.18.*; от 6.19 нататък
  • Siemens: още 4 продукта, добавени от Siemens

    RUGGEDCOM RST2428P, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP, SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

  • Red Hat: още 8 продукта, добавени от Red Hat

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.4 Extended Update Support, Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8

Вид слабост

История

  • 13 февруари 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-23111: Linux, грешка в паметта | freedomonline.bg