CVE-2026-68103: Linux, състезание за ресурс

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: reject mapping a reserved doorbell to a new queue When creating an user-queue, the user space provides a doorbell BO handle and an offset within the bo to obtain a doorbell. However current implementation using xa_store_irq() to store a doorbell, which allows a later queue created with the same BO and offset parameters to overwrite an existing queue and doorbell mapping. This can cause problems like misrouting fence IRQ processing to a wrong queue, and mislead the cleanup process of one queue erasing the mapping of another queue. This commit fixes this issue by replacing xa_store_irq with xa_insert_irq, which rejects mapping a reserved doorbell to a newly created queue (cherry picked from commit 6244eae22966350db52faf9c1369d3b2ffc5de4e)

Засегнати продукти

• Linux Linux: 8949843762631d9d0fc526dfb61a272dca29fc6f преди 1050d258c7c56066d2dcaedf8d0ef66364062adc; 8949843762631d9d0fc526dfb61a272dca29fc6f преди a609b6278bf3cde17eeee6620091465521e4b02c
• Linux Linux: 6.16; преди 6.16; 7.1.6 до 7.1.*; от 7.2 нататък

Вид слабост

• CWE-662 Improper Synchronization

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99265
• CVE-2026-99261
• CVE-2026-99260

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-68103
• https://nvd.nist.gov/vuln/detail/CVE-2026-68103
• https://git.kernel.org/stable/c/1050d258c7c56066d2dcaedf8d0ef66364062adc
• https://git.kernel.org/stable/c/a609b6278bf3cde17eeee6620091465521e4b02c