From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AA6904854ED for ; Thu, 24 Sep 2026 15:21:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790263310; cv=none; b=DhPdwB0gIUts4orua51wIrTvbrjMdBb2c8M7RcVDlsorr8rtW7aLqDWSTT+5OriDS97uhtgBHI1Eq9fjD3kae6kasm4brVn9UDYIViJTD0f6xp+I4kX28C9joA/vS3p3FtakF23tsAqekF00f4pZhvavbP0NFC4Uq7zANVwQ5UI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790263310; c=relaxed/simple; bh=RmTTWDeknXtlpcoeDD4/tVwsUzpQ7gaBzlZKGNjAQSQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=WXALDrFCl23Kr7lbqwkygVCSvGbNjjZ4jNna3r3ZKEqp49eUV9jzwloJolovJqhgA/6v6GWiqPHRvprwzICYP+tWukRAhFrYlhN6EVEDTmum7vTyJVKKpQzgl/LcxdW0L3oFrm/tpslf5kjJHuHT+T28P4NsqAAZRak6ZgkEJrY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=cJioKSlN; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="cJioKSlN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B16601F000FF; Thu, 24 Sep 2026 15:21:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790263308; bh=wHuvb5z3ZOR+iVMxNTBpW1boIBs0IN0oXy4u1HUyfHc=; h=From:To:Cc:Subject:Date:Reply-To; b=cJioKSlNHI2eJ9q6V8apUDeyFjMZL962Lx747ZbSfryJxYa2vIlbQyN8rgbfiVHeU 1nPK8iohR5JFfpUB1TijRH9t4tkINgXvKJPmfPTDhy+ypJ070/1K5x68mh//TDV+lE eXkdRYQFJPE/dnF5PvdC6+x2IfVpvKjBzbtJy8Xc= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-93224: svcrdma: Fix unmatched rn_unregister on failed accept Date: Thu, 24 Sep 2026 17:21:08 +0200 Message-ID: <2026092407-CVE-2026-93224-9dc0@gregkh> X-Mailer: git-send-email 2.55.0 Reply-To: , Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=4206; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=hrwie/br+UBv28NK7T5Y5VLKSRpuDYFkS991fJnnRaw=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlb7R83WLpFfpn8PWuCb3+H1skX5/lnST3O+JSTtvBlz hu16knSHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjARhUsM8zTUZzRyfz9w0r8v zEjHSMJBSEw5nGHB5IM3F/GmLl7aG/1eefv2j2G1vBeXAQA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman Description =========== In the Linux kernel, the following vulnerability has been resolved: svcrdma: Fix unmatched rn_unregister on failed accept When svc_rdma_accept() takes the errout path before rpcrdma_rn_register() has succeeded, the existing cleanup block calls rpcrdma_rn_unregister(dev, &newxprt->sc_rn) unconditionally. svcxprt_rdma is kzalloc'd, so on that path sc_rn.rn_index is 0 and sc_rn.rn_done is NULL; the unregister therefore xa_erase()s another caller's slot 0 and performs an unmatched kref_put() on the rpcrdma_device's rd_kref. The same errout also brackets the cleanup with svc_xprt_get()/ svc_xprt_put() around the kref_init() birth reference. The kref goes 1 -> 2 -> 1 and never reaches 0, so the svcxprt_rdma (and the net/ns_tracker it pinned) is leaked on every failed accept. rpcrdma_rn_register() writes rn->rn_done last, only after xa_alloc() and kref_get() have both succeeded, so rn_done == NULL is a natural "never registered" sentinel. Guard rpcrdma_rn_unregister() with an early return when rn_done is NULL, and clear rn_done before the matching xa_erase() so a repeated unregister is also a no-op. With that guard in place, the accept errout drops the kref_init() birth reference via svc_xprt_put(), which dispatches svc_rdma_free(). Teardown of sc_qp, sc_sq_cq, sc_rq_cq, and sc_pd runs under existing IS_ERR/NULL guards in svc_rdma_free(); sc_rn is covered by the new rn_done sentinel; sc_cm_id is non-NULL on every errout path because svc_rdma_accept() dereferences it above the first goto errout. svc_xprt_free() drops the module reference associated with the freed transport, and svc_handle_xprt() drops its pre-acquired reference when ->xpo_accept() returns NULL. Take a replacement module reference before svc_xprt_put() so the two module_put()s remain balanced. The rn_done guard also covers svc_rdma_free()'s non-listener call to rpcrdma_rn_unregister() for transports whose register attempt failed or never ran. The Linux kernel CVE team has assigned CVE-2026-93224 to this issue. Affected and fixed versions =========================== Issue introduced in 6.12.35 with commit cb3cba0ec372fa7c5f5f5c12990bef02e458ab86 and fixed in 6.12.109 with commit 0335800071a6dfdf7d21d729b5e7d8fa98936211 Issue introduced in 6.16 with commit 8ac6fcae5dc0e801f1c82a83f5ae2c0a4db19932 and fixed in 6.18.50 with commit 5aabe070c00e5bdf4ab150fb5f72ad5f266d6241 Issue introduced in 6.16 with commit 8ac6fcae5dc0e801f1c82a83f5ae2c0a4db19932 and fixed in 7.2.4 with commit 45a444a17240f4fa2235f0dfd4a96fc80f1eb2c2 Issue introduced in 6.16 with commit 8ac6fcae5dc0e801f1c82a83f5ae2c0a4db19932 and fixed in 7.3-rc1 with commit 26190394c64c9429481fc88a4738f70bb92fb352 Issue introduced in 6.15.4 with commit d310955106c358c8e1ea682defd8e21af44a6cba Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2026-93224 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/sunrpc/xprtrdma/ib_client.c net/sunrpc/xprtrdma/svc_rdma_transport.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/0335800071a6dfdf7d21d729b5e7d8fa98936211 https://git.kernel.org/stable/c/5aabe070c00e5bdf4ab150fb5f72ad5f266d6241 https://git.kernel.org/stable/c/45a444a17240f4fa2235f0dfd4a96fc80f1eb2c2 https://git.kernel.org/stable/c/26190394c64c9429481fc88a4738f70bb92fb352