{"id":2224501,"url":"http://patchwork.ozlabs.org/api/patches/2224501/?format=json","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=json","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=json","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=json","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":"","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\" ,\n Stefano Garzarella , DARKNAVY ","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 ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","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 \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 \nSigned-off-by: Stefano Garzarella \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"]}