CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
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: fs/resctrl: Fix use-after-free during unmount During unmount or failure teardown all mon_data structures that contain monitoring event file private data are freed after which kernfs nodes are removed. However, the RDT_DELETED flag is never set for the statically allocated default resource group. A concurrent reader of an event file associated with the default resource group may, after dropping kernfs active protection, block on rdtgroup_mutex while unmount proceeds to free the file private data and destroy the kernfs node without waiting for the reader. When the mutex is released, the reader wakes up, observes that RDT_DELETED is not set for the default group, and dereferences the already-freed file private data. The scenario can be depicted as follows: CPU0 CPU1 /* * Default resource group's * monitoring data accessible via * kernfs file with kernfs_node::priv * pointing to a struct mon_data. * User opens the file for reading. */ rdtgroup_mondata_show() /* arch encounters fatal error */ rdtgroup_kn_lock_live() resctrl_exit() atomic_inc(&rdtgroup_default.waitcount) cpus_read_lock() kernfs_break_active_protection(kn) mutex_lock(&rdtgroup_mutex) cpus_read_lock() resctrl_fs_teardown() mutex_lock(&rdtgroup_mutex) rmdir_all_sub() mon_put_kn_priv() /* Delete all mon_data structures */ rdtgroup_destroy_root() kernfs_destroy_root() rdtgroup_default.kn = NULL mutex_unlock(&rdtgroup_mutex) /* * rdtgroup_default.flags is empty so * rdtgroup_kn_lock_live
Засегнати продукти
- Linux Linux: 2a65660385444e9d9deffe995c71ee20443ef76e преди 7b7bb07efe41bb646a93c4624aa2bb35df190342; 2a65660385444e9d9deffe995c71ee20443ef76e преди 7d330a1d663381579b9d5dafa642b1b3158a0ce2; 2a65660385444e9d9deffe995c71ee20443ef76e преди 52fce648607e0d6a76eeb443d78708c49df1c554
- Linux Linux: 6.16; преди 6.16; 6.18.42 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък
Вид слабост
История
- 15 август 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-72080
- https://nvd.nist.gov/vuln/detail/CVE-2026-72080
- https://git.kernel.org/stable/c/7b7bb07efe41bb646a93c4624aa2bb35df190342
- https://git.kernel.org/stable/c/7d330a1d663381579b9d5dafa642b1b3158a0ce2
- https://git.kernel.org/stable/c/52fce648607e0d6a76eeb443d78708c49df1c554