CVE-2021-4460
BaseFortify
Publication date: 2025-10-01
Last updated on: 2025-12-10
Assigner: kernel.org
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | to 5.4.118 (exc) |
| linux | linux_kernel | From 5.5 (inc) to 5.10.36 (exc) |
| linux | linux_kernel | From 5.11 (inc) to 5.11.20 (exc) |
| linux | linux_kernel | From 5.12 (inc) to 5.12.3 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-125 | The product reads data past the end, or before the beginning, of the intended buffer. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability occurs in the Linux kernel's drm/amdkfd component where a shift operation is performed with a number of bits shifted equal to the number of bits in the operand, which is undefined behavior. Specifically, if get_num_sdma_queues or get_num_xgmi_sdma_queues returns 0, this problematic shift happens. The fix involves setting num_sdma_queues or num_xgmi_sdma_queues to ULLONG_MAX if the count is greater than or equal to the number of bits in the operand to avoid the undefined shift.
How can this vulnerability impact me? :
The vulnerability can cause undefined behavior in the Linux kernel when performing certain shift operations, which may lead to system instability, crashes, or unexpected behavior in the drm/amdkfd component. This could affect systems using AMD kernel drivers related to SDMA queues, potentially impacting system reliability.