CVE-2026-90309

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.

References

• https://git.kernel.org/stable/c/05b8ca493dd02319bca93c640b259c2ba51ef321
• https://git.kernel.org/stable/c/1fc9c1933959d2776a1ce7bf424251b8b5b586cd
• https://git.kernel.org/stable/c/4545f355654d044d35a31cd01cc46f491a8a7c36
• https://git.kernel.org/stable/c/610ef81797bb4f709e8675c1d8d093bb9ccdcbd8
• https://git.kernel.org/stable/c/98df2aee1459ee1c62c70cbe9b370d2a532aea36