Bug 2536163 (CVE-2026-93108)

Summary: CVE-2026-93108 kernel: RDMA/ipoib: Drain RCU callbacks during module teardown
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's RDMA/ipoib module. A race condition during module teardown allows the `ib_ipoib` module to be unloaded while its code is still executing. This can occur when IPoIB reclamation completions are signaled from within an RCU (Read-Copy-Update) callback, or during client registration failures. This vulnerability could lead to a system crash, resulting in a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description OSIDB Bzimport 2026-09-17 16:41:05 UTC 
In the Linux kernel, the following vulnerability has been resolved:

RDMA/ipoib: Drain RCU callbacks during module teardown

IPoIB reclamation completions can be signaled from inside an RCU callback.
Teardown can wake before the callback returns and unload ib_ipoib while its
code is still executing.

Client registration failure can also remove already-added devices and queue
callbacks. Wait after client and workqueue teardown.
Comment 1 gkamathe 2026-09-19 15:44:11 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93108.mbox