RDMA/erdma: Hold CQ references when processing EQ events
In the Linux kernel, the following vulnerability has been resolved: RDMA/erdma: Hold CQ references when processing EQ events EQ handlers look up CQs from dev->cq_xa and invoke CQ completion or error callbacks outside the xarray lock. erdma_destroy_cq() can erase the CQ from the xarray and free its queue buffer and doorbell record while a previously scheduled EQ handler is still using the CQ. Add a CQ refcount and take a reference under the xarray lock with refcount_inc_not_zero(). Remove the CQ from the xarray before dropping the destroy-path reference, then wait for in-flight EQ users before releasing CQ resources.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 6.1.188, 6.12.110, 6.18.52, 6.6.157, 7.2.6
- CVEs
- CVE-2026-90309
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 02:01 UTC · Revision 1
Source evidence
RDMA/erdma: Hold CQ references when processing EQ events
core-osv · Original sourcePublished 17 Sept 2026, 16:08 UTC
In the Linux kernel, the following vulnerability has been resolved: RDMA/erdma: Hold CQ references when processing EQ events EQ handlers look up CQs from dev->cq_xa and invoke CQ completion or error callbacks outside the xarray lock. erdma_destroy_cq() can erase the CQ from the xarray and free its queue buffer and doorbell record while a previously scheduled EQ handler is still using the CQ. Add a CQ refcount and take a reference under the xarray lock with refcount_inc_not_zero(). Remove the CQ from the xarray before dropping the destroy-path reference, then wait for in-flight EQ users before releasing CQ resources.
osv:CVE-2026-90309
Kernel
Fixed versions: 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6
Complete source record
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"title": "RDMA/erdma: Hold CQ references when processing EQ events",
"summary": "In the Linux kernel, the following vulnerability has been resolved: RDMA/erdma: Hold CQ references when processing EQ events EQ handlers look up CQs from dev->cq_xa and invoke CQ completion or error callbacks outside the xarray lock. erdma_destroy_cq() can erase the CQ from the xarray and free its queue buffer and doorbell record while a previously scheduled EQ handler is still using the CQ. Add a CQ refcount and take a reference under the xarray lock with refcount_inc_not_zero(). Remove the CQ from the xarray before dropping the destroy-path reference, then wait for in-flight EQ users before releasing CQ resources.",
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"modified": "2026-10-28T02:30:48.881618034Z",
"provider": "osv",
"references": [
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"source_id": "core-osv",
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