Към съдържанието
Търсене

CVE-2026-74660: Linux

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.

  • 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: ebt_nflog: pin the NFLOG backend nf_log_unregister() runs after the per-net teardown so its final RCU grace period also drains readers that obtained the logger from a per-net binding. However, ebt_nflog passes an explicit ULOG log type to nf_log_packet() without holding a reference on the selected logger module, unlike the xt_NFLOG and nft_log frontends. An ebtables nflog rule can therefore remain callable while nfnetlink_log is unloaded. The resulting interleaving is: CPU 0 CPU 1 nfnetlink_log_fini() unregister_pernet_subsys() kfree(nfnl_log_pernet(net)) ebt_nflog_tg() nf_log_packet() nfulnl_log_packet() instance_lookup_get_rcu() The global ULOG logger is still registered at this point, so CPU 1 dereferences the per-net state after CPU 0 has freed it. KASAN reported: BUG: KASAN: slab-use-after-free in instance_lookup_get_rcu Read of size 8 at addr ff110001052e6210 by task poc/92 Call Trace: instance_lookup_get_rcu+0x1ce/0x1f0 [nfnetlink_log] nfulnl_log_packet+0x248/0x2fb0 [nfnetlink_log] nf_log_packet+0x204/0x300 ebt_nflog_tg+0x351/0x550 ebt_do_table+0xedf/0x22b0 Allocated by task 90: __kmalloc_noprof+0x186/0x470 ops_init+0x6d/0x420 register_pernet_operations+0x2f6/0x670 register_pernet_subsys+0x23/0x40 Freed by task 93: kfree+0x131/0x3c0 ops_undo_list+0x3e3/0x700 unregister_pernet_operations+0x232/0x490 unregister_pernet_subsys+0x1c/0x30 nfnetlink_log_fini+0x34/0x450 [nfnetlink_log] Acquire the ULOG logger module reference when an ebt_nflog rule is validated and release it when the rule is destroyed. Request the NFLOG backend for legacy callers when needed, matching xt_NFLOG. This prevents module teardown until all ebt_

Засегнати продукти

  • Linux Linux: c83fa19603bdaeef17b815713dbbe3230c8a34ee преди 3bcce49d617c593c7606083bfdb464a1761fa68d; c83fa19603bdaeef17b815713dbbe3230c8a34ee преди 394d7939c6b2b9e6bea0844c89efb5913168d898; c83fa19603bdaeef17b815713dbbe3230c8a34ee преди 2cac4294f184c9bc19ff82552c62b80498694c39; c83fa19603bdaeef17b815713dbbe3230c8a34ee преди 9d8a94b48b393885e7f876c8ef68ed4da5012078; c83fa19603bdaeef17b815713dbbe3230c8a34ee преди 6809379a860b9fccbb5435bf08343f6d081ac68d; c83fa19603bdaeef17b815713dbbe3230c8a34ee преди 47a119ec8a7e2d5c8c4e86fb1a56c4e696e500fb; c83fa19603bdaeef17b815713dbbe3230c8a34ee преди e2ab7e878bdbe80104c879c31fd2d82a476703b8; c83fa19603bdaeef17b815713dbbe3230c8a34ee преди 30825970339c107bacaf7f61af90fcdb1f597ca1
  • Linux Linux: 4.12; преди 4.12; 5.10.265 до 5.10.*; 5.15.216 до 5.15.*; 6.1.183 до 6.1.*; 6.6.152 до 6.6.*; 6.12.104 до 6.12.*; 6.18.45 до 6.18.*; 7.1.9 до 7.1.*; от 7.2 нататък

История

  • 22 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-74660: Linux | freedomonline.bg