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CVE-2026-89662: Linux

9.8

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 по мрежата, без особени условия, без вход и без действие от потребителя.

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

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent lock owner use-after-free during client teardown __destroy_client() releases a client's open owners, but a lock owner whose only reference is a blocked lock (nbl) stays on cl_ownerstr_hashtbl. client_has_state() does not count a bare owner, so DESTROY_CLIENTID can reach __destroy_client() with such owners present. __destroy_client() then walks the table, calling remove_blocked_locks() on each owner without a reference. Freeing a blocked lock drops the owner reference held via flc_owner. The per-net laundromat reaps blocked locks from nn->blocked_locks_lru independently of client state. The two paths share blocked_locks_lock only for the list splice, not the owner's lifetime. The laundromat therefore frees the owner as __destroy_client() dereferences it, a NULL dereference in remove_blocked_locks(). nfsd4_release_lockowner() holds a reference across the same call; __destroy_client() does not. Hold cl_lock across the walk, taking a reference and unhashing each owner, then drop it before remove_blocked_locks() and nfs4_put_stateowner(), which take blocked_locks_lock and cl_lock.

Засегнати продукти

  • Linux Linux: 68ef3bc3166468678d5e1fdd216628c35bd1186f преди 42d7954b0a1907d4ef122aef94561952a033cdc3; 68ef3bc3166468678d5e1fdd216628c35bd1186f преди bb38ff8b4dafbbd1781ad37cd96722fdf2cd972a; 68ef3bc3166468678d5e1fdd216628c35bd1186f преди b8bad5a11416b26cc7fd4b18fba46d75ff636558; 68ef3bc3166468678d5e1fdd216628c35bd1186f преди 1ce74d1b7770e69735e8f8e509807af4ff9c8ee7; 68ef3bc3166468678d5e1fdd216628c35bd1186f преди a6ead6fff3a7d03e49845f048f7000a2e0d34431; 68ef3bc3166468678d5e1fdd216628c35bd1186f преди 4804c58f73a80d12df1de323bf97a164f6ee8743; 68ef3bc3166468678d5e1fdd216628c35bd1186f преди 8cf4ff0a7c083dd5e0067f517d63979b74b66649; 68ef3bc3166468678d5e1fdd216628c35bd1186f преди 5e2fa29d223a9a1e6a948e40b109d09081d1decd; e294c4c2d33b7307a89cdf31bec08a112d6a9297; 797bfd05d4040fbf766198b3cfcc1838002cc890; 0f44e9da465ea259b6c9f31a627f3c50a16e1679; 4.9.91 преди 4.10; 4.14.31 преди 4.15; 4.15.14 преди 4.16
  • Linux Linux: 4.16; преди 4.16; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.109 до 6.12.*; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

История

  • 11 септември 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-89662: Linux | freedomonline.bg