Tracker / CVE-2023-53171
CVE-2023-53171
In the Linux kernel, the following vulnerability has been resolved: vfio/type1: prevent underflow of locked_vm via exec() When a vfio container is preserved across exec, the task does not change, but it gets a new mm with locked_vm=0, and loses the count from existing dma mappings. If the user later unmaps a dma mapping, locked_vm underflows to a large unsigned value, and a subsequent dma map request fails with ENOMEM in __account_locked_vm. To avoid underflow, grab and save the mm at the time a dma is mapped. Use that mm when adjusting locked_vm, rather than re-acquiring the saved task's mm, which may have changed. If the saved mm is dead, do nothing. locked_vm is incremented for existing mappings in a subsequent patch.
Affected products and versions
| linux | linux_kernel · 3.6 → 5.10.173 |
|---|---|
| linux | linux_kernel · 5.11 → 5.15.99 |
| linux | linux_kernel · 5.16 → 6.1.16 |
| linux | linux_kernel · 6.2 → 6.2.3 |