CVE-2026-98367

7.8 HIGH

Published 2026-10-06 · Updated 2026-10-07

AI risk analysis

Summary: The Linux kernel's RDMA/siw implementation has a race condition where the connection endpoint (cep) reference is not properly cleared under a lock when QP modification fails during acceptance. This can lead to use-after-free conditions when concurrent operations try to modify the QP state, potentially allowing attackers to corrupt memory or escalate privileges.
Exploitability: Exploitation requires concurrent access to a RDMA QP with specific timing windows, making it moderately difficult but possible with controlled network conditions and concurrent thread manipulation.
Blast radius: The vulnerability could affect systems running RDMA-enabled applications that handle concurrent QP modifications, potentially leading to kernel memory corruption or privilege escalation in high-traffic RDMA environments.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Apply the kernel patch for Linux kernel version 6.10 or later which fixes the siw_qp_modify failure handling in siw_accept().

rdmakernelmemory-corruption

Analysis generated locally by garnet-coder (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Clear association under lock if siw_qp_modify fails in siw_accept We need to clear cep before release state_lock as siw_qp_llp_close and siw_qp_modify->siw_qp_llp_close did. Otherwise if siw_qp_modify() fails in siw_accept(), the QP's state_lock is released before the error path cleanup. A concurrent ibv_modify_qp() transitioning the QP to ERROR can race in this window: siw_accept() ibv_modify_qp(ERROR) ---------------------- ---------------------- siw_qp_modify() fails up_write(&qp->state_lock) down_write(&qp->state_lock) nextstate_from_idle(): if (qp->cep) siw_cep_put(qp->cep) <- frees cep qp->cep = NULL goto error cep->qp = NULL <- UAF Clear qp->cep and drop the association reference taken by siw_cep_get(), all under the write lock held from the initial down_write(&qp->state_lock). Thread B therefore sees qp->cep == NULL, skips its own put, and cannot free the cep before siw_accept() is done with it.

CVSS vector

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

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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