Description
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.
References6
- git.kernel.org/stable/c/05b8ca493dd02319bca93c640b259c2ba51ef321
- git.kernel.org/stable/c/1fc9c1933959d2776a1ce7bf424251b8b5b586cd
- git.kernel.org/stable/c/4545f355654d044d35a31cd01cc46f491a8a7c36
- git.kernel.org/stable/c/610ef81797bb4f709e8675c1d8d093bb9ccdcbd8
- git.kernel.org/stable/c/98df2aee1459ee1c62c70cbe9b370d2a532aea36
- git.kernel.org/stable/c/c0a83f29a24c7e7f8516630848ef6db4c174deed
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 6 · as of 8 November 2026
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