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: iommu/vt-d: Fix race condition during PASID entry replacement The Intel VT-d PASID table entry is 512 bits (64 bytes). When replacing an active PASID entry (e.g., during domain replacement), the current implementation calculates a new entry on the stack and copies it to the table using a single structure assignment. struct pasid_entry *pte, new_pte; pte = intel_pasid_get_entry(dev, pasid); pasid_pte_config_first_level(iommu, &new_pte, ...); *pte = new_pte; Because the hardware may fetch the 512-bit PASID entry in multiple 128-bit chunks, updating the entire entry while it is active (Present bit set) risks a "torn" read. In this scenario, the IOMMU hardware could observe an inconsistent state — partially new data and partially old data — leading to unpredictable behavior or spurious faults. Fix this by removing the unsafe "replace" helpers and following the "clear-then-update" flow, which ensures the Present bit is cleared and the required invalidation handshake is completed before the new configuration is applied.
Засегнати продукти
- Linux Linux: 7543ee63e8113aa34b07df3b16b3b9d2c5f73939 преди 4718007870547e1efebbdd6745d9fce58f008fef; 7543ee63e8113aa34b07df3b16b3b9d2c5f73939 преди 66a7aff480a82b8642b3991fed5fdc9780022157; 7543ee63e8113aa34b07df3b16b3b9d2c5f73939 преди c3b1edea3791fa91ab7032faa90355913ad9451b
- Linux Linux: 6.13; преди 6.13; 6.18.39 до 6.18.*; 6.19.4 до 6.19.*; от 7.0 нататък
Вид слабост
История
- 27 май 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-45945
- https://nvd.nist.gov/vuln/detail/CVE-2026-45945
- https://git.kernel.org/stable/c/4718007870547e1efebbdd6745d9fce58f008fef
- https://git.kernel.org/stable/c/66a7aff480a82b8642b3991fed5fdc9780022157
- https://git.kernel.org/stable/c/c3b1edea3791fa91ab7032faa90355913ad9451b