High 7.8Published Sep 17, 2026

CVE-2026-90309RDMA/erdma: Hold CQ references when processing EQ events

Updated under an hour ago (Oct 27, 2026, 2:40 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	155055771704f8cbb5c176a4309b7dc30a50450c builds before 610ef81797bb4f709e8675c1d8d093bb9ccdcbd8; from 155055771704f8cbb5c176a4309b7dc30a50450c before c0a83f29a24c7e7f8516630848ef6db4c174deed; 155055771704f8cbb5c176a4309b7dc30a50450c builds before 05b8ca493dd02319bca93c640b259c2ba51ef321; 155055771704f8cbb5c176a4309b7dc30a50450c builds before 1fc9c1933959d2776a1ce7bf424251b8b5b586cd; 155055771704f8cbb5c176a4309b7dc30a50450c builds before 4545f355654d044d35a31cd01cc46f491a8a7c36; 155055771704f8cbb5c176a4309b7dc30a50450c builds before 98df2aee1459ee1c62c70cbe9b370d2a532aea36	CNA record

References

References

https://git.kernel.org/stable/c/610ef81797bb4f709e8675c1d8d093bb9ccdcbd8
https://git.kernel.org/stable/c/c0a83f29a24c7e7f8516630848ef6db4c174deed
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/98df2aee1459ee1c62c70cbe9b370d2a532aea36

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.