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CVE-2026-22980: 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: nfsd: provide locking for v4_end_grace Writing to v4_end_grace can race with server shutdown and result in memory being accessed after it was freed - reclaim_str_hashtbl in particularly. We cannot hold nfsd_mutex across the nfsd4_end_grace() call as that is held while client_tracking_op->init() is called and that can wait for an upcall to nfsdcltrack which can write to v4_end_grace, resulting in a deadlock. nfsd4_end_grace() is also called by the landromat work queue and this doesn't require locking as server shutdown will stop the work and wait for it before freeing anything that nfsd4_end_grace() might access. However, we must be sure that writing to v4_end_grace doesn't restart the work item after shutdown has already waited for it. For this we add a new flag protected with nn->client_lock. It is set only while it is safe to make client tracking calls, and v4_end_grace only schedules work while the flag is set with the spinlock held. So this patch adds a nfsd_net field "client_tracking_active" which is set as described. Another field "grace_end_forced", is set when v4_end_grace is written. After this is set, and providing client_tracking_active is set, the laundromat is scheduled. This "grace_end_forced" field bypasses other checks for whether the grace period has finished. This resolves a race which can result in use-after-free.

Засегнати продукти

  • Linux Linux: 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 преди ca97360860eb02e3ae4ba42c19b439a0fcecbf06; 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 преди e8bfa2401d4c51eca6e48e9b33c798828ca9df61; 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 преди 34eb22836e0cdba093baac66599d68c4cd245a9d; 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 преди 06600719d0f7a723811c45e4d51f5b742f345309; 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 преди ba4811c8b433bfa681729ca42cc62b6034f223b0; 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 преди 53f07d095e7e680c5e4569a55a019f2c0348cdc6; 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 преди 2857bd59feb63fcf40fe4baf55401baea6b4feb4
  • Linux Linux: 3.18; преди 3.18; 5.10.248 до 5.10.*; 5.15.198 до 5.15.*; 6.1.161 до 6.1.*; 6.6.121 до 6.6.*; 6.12.66 до 6.12.*; 6.18.6 до 6.18.*; от 6.19 нататък
  • Siemens: още 3 продукта, добавени от Siemens

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP, SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Вид слабост

История

  • 23 януари 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-22980: Linux, състезание за ресурс | freedomonline.bg