dmaengine: idxd: Fix double free in idxd_setup_wqs()
In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Fix double free in idxd_setup_wqs() The clean up in idxd_setup_wqs() has had a couple bugs because the error handling is a bit subtle. It's simpler to just re-write it in a cleaner way. The issues here are: 1) If "idxd->max_wqs" is <= 0 then we call put_device(conf_dev) when "conf_dev" hasn't been initialized. 2) If kzalloc_node() fails then again "conf_dev" is invalid. It's either uninitialized or it points to the "conf_dev" from the previous iteration so it leads to a double free. It's better to free partial loop iterations within the loop and then the unwinding at the end can handle whole loop iterations. I also renamed the labels to describe what the goto does and not where the goto was located.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 6.1.153, 6.12.48, 6.16.8, 6.6.107
- CVEs
- CVE-2025-39870
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 17:26 UTC · Revision 1
Source evidence
dmaengine: idxd: Fix double free in idxd_setup_wqs()
core-osv · Original sourcePublished 23 Sept 2025, 06:00 UTC
In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Fix double free in idxd_setup_wqs() The clean up in idxd_setup_wqs() has had a couple bugs because the error handling is a bit subtle. It's simpler to just re-write it in a cleaner way. The issues here are: 1) If "idxd->max_wqs" is <= 0 then we call put_device(conf_dev) when "conf_dev" hasn't been initialized. 2) If kzalloc_node() fails then again "conf_dev" is invalid. It's either uninitialized or it points to the "conf_dev" from the previous iteration so it leads to a double free. It's better to free partial loop iterations within the loop and then the unwinding at the end can handle whole loop iterations. I also renamed the labels to describe what the goto does and not where the goto was located.
osv:CVE-2025-39870
Kernel
Fixed versions: 6.1.153, 6.6.107, 6.12.48, 6.16.8
Complete source record
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"modified": "2026-10-28T02:30:30.811533321Z",
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"source_id": "core-osv",
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