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CVE-2026-90309

HIGHCVSS 7.8/10

Last modified

CVE-2026-90309 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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().

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 155055771704f8cbb5c176a4309b7dc30a50450c, < 610ef81797bb4f709e8675c1d8d093bb9ccdcbd8; >= 155055771704f8cbb5c176a4309b7dc30a50450c, < c0a83f29a24c7e7f8516630848ef6db4c174deed; >= 155055771704f8cbb5c176a4309b7dc30a50450c, < 05b8ca493dd02319bca93c640b259c2ba51ef321; >= 155055771704f8cbb5c176a4309b7dc30a50450c, < 1fc9c1933959d2776a1ce7bf424251b8b5b586cd; >= 155055771704f8cbb5c176a4309b7dc30a50450c, < 4545f355654d044d35a31cd01cc46f491a8a7c36; >= 155055771704f8cbb5c176a4309b7dc30a50450c, < 98df2aee1459ee1c62c70cbe9b370d2a532aea36
LinuxLinux6.0

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90309?
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.
How severe is CVE-2026-90309?
CVE-2026-90309 has a CVSS score of 7.8/10 (HIGH severity).
How do I fix CVE-2026-90309?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST