Bug 2536549 (CVE-2026-92513)

Summary: CVE-2026-92513 kernel: RDMA/mana_ib: drain QP references after partial table insertion
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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 (Remote Direct Memory Access) mana_ib component. The `mana_table_store_ud_qp()` function can incorrectly manage queue pair (QP) references during partial table insertions. This can lead to a use-after-free vulnerability, where a freed memory region is accessed, potentially allowing a local attacker to cause a system crash (denial of service) or execute arbitrary code.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-17 18:22:11 UTC 
In the Linux kernel, the following vulnerability has been resolved:

RDMA/mana_ib: drain QP references after partial table insertion

mana_table_store_ud_qp() publishes a QP at its send-queue id before
inserting the receive-queue id, dropping the XArray lock between the two
xa_insert_irq() calls. A concurrent completion handler can look up the QP
and take a transient reference. When the second insertion fails, the
rollback erased only the send-queue entry and returned, leaving both the
initial table reference and the transient reference outstanding while RDMA
core frees the QP, causing a use-after-free.

Drain the reference as normal destruction does: drop the initial reference
and wait for qp->free, releasing the QP only after every concurrent lookup
returns its reference.
Comment 1 gkamathe 2026-09-21 02:12:23 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-92513.mbox