RDMA/erdma: Hold CQ references when processing EQ events (CVE-2026-90309) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90309

RDMA/erdma: Hold CQ references when processing EQ events

Answer in brief

CVE-2026-90309 records a Unknown severity vulnerability in RDMA/erdma: Hold CQ references when processing EQ events. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=155055771704f8cbb5c176a4309b7dc30a50450c <610ef81797bb4f709e8675c1d8d093bb9ccdcbd8 \|\| >=155055771704f8cbb5c176a4309b7dc30a50450c <c0a83f29a24c7e7f8516630848ef6db4c174deed \|\| >=155055771704f8cbb5c176a4309b7dc30a50450c <05b8ca493dd02319bca93c640b259c2ba51ef321 \|\| >=155055771704f8cbb5c176a4309b7dc30a50450c <1fc9c1933959d2776a1ce7bf424251b8b5b586cd \|\| >=155055771704f8cbb5c176a4309b7dc30a50450c <4545f355654d044d35a31cd01cc46f491a8a7c36 \|\| >=155055771704f8cbb5c176a4309b7dc30a50450c <98df2aee1459ee1c62c70cbe9b370d2a532aea36	610ef81797bb4f709e8675c1d8d093bb9ccdcbd8, c0a83f29a24c7e7f8516630848ef6db4c174deed, 05b8ca493dd02319bca93c640b259c2ba51ef321, 1fc9c1933959d2776a1ce7bf424251b8b5b586cd, 4545f355654d044d35a31cd01cc46f491a8a7c36, 98df2aee1459ee1c62c70cbe9b370d2a532aea36
Linux/Linuxgeneric	6.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 610ef81797bb4f709e8675c1d8d093bb9ccdcbd8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.