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CVE-2026-74493: 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: net/smc: fix socket use-after-free during link group termination __smc_lgr_terminate() drops conns_lock after finding a connection in lgr->conns_all, but before taking a reference on its socket. The connection is embedded in the socket, and its registration reference protects it only while the connection remains in the tree. A concurrent close can unregister the connection and drop that reference, freeing the socket before the termination worker reaches sock_hold(). The race is reachable when close overlaps link group termination. Local stress testing reproduced the use-after-free and KASAN reported: BUG: KASAN: slab-use-after-free in __smc_lgr_terminate.part.0 [smc] Write of size 4 by task kworker/3:3 Workqueue: events smc_lgr_terminate_work [smc] __smc_lgr_terminate.part.0 [smc] The socket was allocated by smc_create(), freed through slab_free_after_rcu_debug(), and was followed by: refcount_t: addition on 0; use-after-free. __smc_lgr_terminate.part.0 [smc] Take the socket reference while conns_lock still protects the tree entry. The unregister path then cannot drop the last reference until termination has finished using the socket.

Засегнати продукти

  • Linux Linux: 69318b5215f2dc32c345a3d65b98b4b1bf29c007 преди ff44f2df57fb5560bdc75eb977867643e764a262; 69318b5215f2dc32c345a3d65b98b4b1bf29c007 преди 9fb17c95b8f0683570fca1fb2792264147af937a; 69318b5215f2dc32c345a3d65b98b4b1bf29c007 преди bea8dc14de2d56aca749d368563e6888217710a5; 69318b5215f2dc32c345a3d65b98b4b1bf29c007 преди 5a42f162b857019a4c10ff687dc3bcdf51831865; 69318b5215f2dc32c345a3d65b98b4b1bf29c007 преди 281c103a8eaed59001ce952f231df1b07674215a; 69318b5215f2dc32c345a3d65b98b4b1bf29c007 преди f807a63d0d95680c34f677700da9148a07d7c78f; 69318b5215f2dc32c345a3d65b98b4b1bf29c007 преди f0541a775d04c88e90ba448e35ce0d743512822a; 69318b5215f2dc32c345a3d65b98b4b1bf29c007 преди f621d6ebeebb6374342571e4ddf45fdbc420f6cd
  • Linux Linux: 5.5; преди 5.5; 5.10.265 до 5.10.*; 5.15.216 до 5.15.*; 6.1.183 до 6.1.*; 6.6.151 до 6.6.*; 6.12.103 до 6.12.*; 6.18.44 до 6.18.*; 7.1.8 до 7.1.*; от 7.2 нататък

История

  • 15 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-74493: Linux | freedomonline.bg