CVE-2023-53171
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
36/100
Published: 2025-09-15
Modified: 2026-11-05
First seen: 2026-11-05
Status: active
Attack Surface
Low Complexity
No Interaction
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
None
I:
None
A:
High
Description
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 Software (7)
| Vendor | Product | Version |
|---|---|---|
| Linux | Linux | 73fa0d10d077d9521ee2dace2307ae2c9a965336 < 5a271242716846cc016736fb76be2b40ee49b0c3 |
| Linux | Linux | 73fa0d10d077d9521ee2dace2307ae2c9a965336 < eafb81c50da899dd80b340c841277acc4a1945b7 |
| Linux | Linux | 73fa0d10d077d9521ee2dace2307ae2c9a965336 < a6b2aabe664098d5cf877ae0fd96459464a30e17 |
| Linux | Linux | 73fa0d10d077d9521ee2dace2307ae2c9a965336 < b0790dff0760b7734cf0961f497ad64628ca550b |
| Linux | Linux | 73fa0d10d077d9521ee2dace2307ae2c9a965336 < 046eca5018f8a5dd1dc2cedf87fb5843b9ea3026 |
| Linux | Linux | 3.6 |
| linux | linux_kernel | 3.6 – 5.10.173 |