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GET /api/patches/2224501/?format=api
{ "id": 2224501, "url": "http://patchwork.ozlabs.org/api/patches/2224501/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260417132645.121192-2-sgarzare@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260417132645.121192-2-sgarzare@redhat.com>", "list_archive_url": null, "date": "2026-04-17T13:26:44", "name": "[1/2] libvhost-user: fix buffer overflow in virtqueue_read_indirect_desc()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "fe83a347a7dcbe29b036c65d1ebf6753ba299922", "submitter": { "id": 75453, "url": "http://patchwork.ozlabs.org/api/people/75453/?format=api", "name": "Stefano Garzarella", "email": "sgarzare@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260417132645.121192-2-sgarzare@redhat.com/mbox/", "series": [ { "id": 500339, "url": "http://patchwork.ozlabs.org/api/series/500339/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=500339", "date": "2026-04-17T13:26:43", "name": "libvhost-user, libvduse: fix buffer overflow (CVE-2026-6425)", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500339/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224501/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224501/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=QY+xrr8F;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=google header.b=Iqt04R3+;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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Tsirkin\" <mst@redhat.com>,\n Stefano Garzarella <sgarzare@redhat.com>, DARKNAVY <vr@darknavy.com>", "Subject": "[PATCH 1/2] libvhost-user: fix buffer overflow in\n virtqueue_read_indirect_desc()", "Date": "Fri, 17 Apr 2026 15:26:44 +0200", "Message-ID": "<20260417132645.121192-2-sgarzare@redhat.com>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260417132645.121192-1-sgarzare@redhat.com>", "References": "<20260417132645.121192-1-sgarzare@redhat.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=170.10.129.124;\n envelope-from=sgarzare@redhat.com;\n helo=us-smtp-delivery-124.mimecast.com", "X-Spam_score_int": "-25", "X-Spam_score": "-2.6", "X-Spam_bar": "--", "X-Spam_report": "(-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.54,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_PASS=-0.001,\n SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "From: Stefano Garzarella <sgarzare@redhat.com>\n\nvirtqueue_read_indirect_desc() copies an indirect descriptor table\ninto a buffer in chunks when the table crosses a memory region\nboundary. The destination is a struct vring_desc pointer but is\nadvanced by a byte count, so each increment moves the pointer by\nread_len elements instead of read_len bytes, writing beyond the\nbuffer.\n\nUse a char pointer for the destination so that the arithmetic\nadvances correctly.\n\nWhile at it, change the source from a struct vring_desc pointer\nto a void pointer: when the table is split across regions,\nvu_gpa_to_va() can return a pointer into the middle of a descriptor,\nso casting it to a struct vring_desc pointer is wrong. The pointer is\nonly used as a memcpy() source, so a void pointer is fine.\n\nFixes: CVE-2026-6425\nFixes: 293084a719 (\"libvhost-user: Support across-memory-boundary access\")\nCc: qemu-stable@nongnu.org\nReported-by: DARKNAVY <vr@darknavy.com>\nSigned-off-by: Stefano Garzarella <sgarzare@redhat.com>\n---\n subprojects/libvhost-user/libvhost-user.c | 7 ++++---\n 1 file changed, 4 insertions(+), 3 deletions(-)", "diff": "diff --git a/subprojects/libvhost-user/libvhost-user.c b/subprojects/libvhost-user/libvhost-user.c\nindex 9c630c2170..014d210748 100644\n--- a/subprojects/libvhost-user/libvhost-user.c\n+++ b/subprojects/libvhost-user/libvhost-user.c\n@@ -2391,8 +2391,9 @@ static int\n virtqueue_read_indirect_desc(VuDev *dev, struct vring_desc *desc,\n uint64_t addr, size_t len)\n {\n- struct vring_desc *ori_desc;\n+ char *dst_desc = (char *)desc;\n uint64_t read_len;\n+ void *ori_desc;\n \n if (len > (VIRTQUEUE_MAX_SIZE * sizeof(struct vring_desc))) {\n return -1;\n@@ -2409,10 +2410,10 @@ virtqueue_read_indirect_desc(VuDev *dev, struct vring_desc *desc,\n return -1;\n }\n \n- memcpy(desc, ori_desc, read_len);\n+ memcpy(dst_desc, ori_desc, read_len);\n len -= read_len;\n addr += read_len;\n- desc += read_len;\n+ dst_desc += read_len;\n }\n \n return 0;\n", "prefixes": [ "1/2" ] }