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CVE-2026-46319: Linux, състезание за ресурс

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: net/sched: act_ct: Only release RCU read lock after ct_ft When looking up a flow table in act_ct in tcf_ct_flow_table_get(), rhashtable_lookup_fast() internally opens and closes an RCU read critical section before returning ct_ft. The tcf_ct_flow_table_cleanup_work() can complete before refcount_inc_not_zero() is invoked on the returned ct_ft resulting in a UAF on the already freed ct_ft object. This vulnerability can lead to privilege escalation. Analysis from [email protected]: When initializing act_ct, tcf_ct_init() is called, which internally triggers tcf_ct_flow_table_get(). static int tcf_ct_flow_table_get(struct net *net, struct tcf_ct_params *params) { struct zones_ht_key key = { .net = net, .zone = params->zone }; struct tcf_ct_flow_table *ct_ft; int err = -ENOMEM; mutex_lock(&zones_mutex); ct_ft = rhashtable_lookup_fast(&zones_ht, &key, zones_params); // [1] if (ct_ft && refcount_inc_not_zero(&ct_ft->ref)) // [2] goto out_unlock; ... } static __always_inline void *rhashtable_lookup_fast( struct rhashtable *ht, const void *key, const struct rhashtable_params params) { void *obj; rcu_read_lock(); obj = rhashtable_lookup(ht, key, params); rcu_read_unlock(); return obj; } At [1], rhashtable_lookup_fast() looks up and returns the corresponding ct_ft from zones_ht . The lookup is performed within an RCU read critical section through rcu_read_lock() / rcu_read_unlock(), which prevents the object from being freed. However, at the point of function return, rcu_read_unlock() has already been called, and there is nothing preventing ct_ft from being freed before reaching refcount_inc_not_zero(&ct_ft->ref) at [2]. This interval

Засегнати продукти

  • Linux Linux: 138470a9b2cc2e26e6018300394afc3858a54e6a преди ece578ca61e572df96cfc80456357ebfae0b4b9e; 138470a9b2cc2e26e6018300394afc3858a54e6a преди a2e0c045c87aa252eb61412e67dd91f2c2b19f81; 138470a9b2cc2e26e6018300394afc3858a54e6a преди 67c9ecc9f2575273ed1323e312881fc98ac83d6d; 138470a9b2cc2e26e6018300394afc3858a54e6a преди f23424a0ddadb494d4bd57056a7ca703312d3a7b; 138470a9b2cc2e26e6018300394afc3858a54e6a преди 17dfb67cb399b660105d9a8c6100851c0d0cdc70; 138470a9b2cc2e26e6018300394afc3858a54e6a преди 4c727c6967a41b37efe0f26332ca9ec5b74785a3; 138470a9b2cc2e26e6018300394afc3858a54e6a преди 3e20e1b3058e0b94638e7b931c138e840e266724; 138470a9b2cc2e26e6018300394afc3858a54e6a преди f462dca0c8415bf0058d0ffa476354c4476d0f09
  • Linux Linux: 5.7; преди 5.7; 5.10.258 до 5.10.*; 5.15.209 до 5.15.*; 6.1.175 до 6.1.*; 6.6.141 до 6.6.*; 6.12.91 до 6.12.*; 6.18.33 до 6.18.*; 7.0.10 до 7.0.*; 7.1 до *

Вид слабост

История

  • 9 юни 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-46319: Linux, състезание за ресурс | freedomonline.bg