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CVE-2026-52991: 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: sched/psi: fix race between file release and pressure write A potential race condition exists between pressure write and cgroup file release regarding the priv member of struct kernfs_open_file, which triggers the uaf reported in [1]. Consider the following scenario involving execution on two separate CPUs: CPU0 CPU1 ==== ==== vfs_rmdir() kernfs_iop_rmdir() cgroup_rmdir() cgroup_kn_lock_live() cgroup_destroy_locked() cgroup_addrm_files() cgroup_rm_file() kernfs_remove_by_name() kernfs_remove_by_name_ns() vfs_write() __kernfs_remove() new_sync_write() kernfs_drain() kernfs_fop_write_iter() kernfs_drain_open_files() cgroup_file_write() kernfs_release_file() pressure_write() cgroup_file_release() ctx = of->priv; kfree(ctx); of->priv = NULL; cgroup_kn_unlock() cgroup_kn_lock_live() cgroup_get(cgrp) cgroup_kn_unlock() if (ctx->psi.trigger) // here, trigger uaf for ctx, that is of->priv The cgroup_rmdir() is protected by the cgroup_mutex, it also safeguards the memory deallocation of of->priv performed within cgroup_file_release(). However, the operations involving of->priv executed within pressure_write() are not entirely covered by the protection of cgroup_mutex. Consequently, if the code in pressure_write(), specifically the section handling the ctx variable executes after cgroup_file_release() has completed, a uaf vulnerability involving of->priv is triggered. Therefore, the issue can be resolved by extending the scope of the cgroup_mutex lock within pressure_write() to encompass all code paths involving of->priv, thereby properly synchronizing the race condition occurring between cgroup_file_release() and pressure_write(). And, if an live kn lock can be successfully acquired while executing the pressure write operation, it indicates that the cgroup deletion process has not yet reached its final stag

Засегнати продукти

  • Linux Linux: 0e94682b73bfa6c44c98af7a26771c9c08c055d5 преди 58e6ca11e45c9d6e52255d1135e7dbff0a360334; 0e94682b73bfa6c44c98af7a26771c9c08c055d5 преди d8ddbc3330fa6851c56b046e630a8fc64830a0ce; 0e94682b73bfa6c44c98af7a26771c9c08c055d5 преди af0638534bfae7980582c6482531a0872f8ee341; 0e94682b73bfa6c44c98af7a26771c9c08c055d5 преди 03dc070fa0fc3cb4068693f468ccd5f8a7e58282; 0e94682b73bfa6c44c98af7a26771c9c08c055d5 преди d4352c0709bfd38c752fccbde7fd72a82ac78f23; 0e94682b73bfa6c44c98af7a26771c9c08c055d5 преди a5b98009f16d8a5fb4a8ff9a193f5735515c38fa
  • Linux Linux: 5.2; преди 5.2; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.114 до 6.12.*; 6.18.33 до 6.18.*; 7.0.10 до 7.0.*; от 7.1 нататък
  • Red Hat: още 5 продукта, добавени от Red Hat

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9

Вид слабост

История

  • 24 юни 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-52991: Linux, състезание за ресурс | freedomonline.bg