{"id":"CVE-2022-48862","summary":"vhost: fix hung thread due to erroneous iotlb entries","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvhost: fix hung thread due to erroneous iotlb entries\n\nIn vhost_iotlb_add_range_ctx(), range size can overflow to 0 when\nstart is 0 and last is ULONG_MAX. One instance where it can happen\nis when userspace sends an IOTLB message with iova=size=uaddr=0\n(vhost_process_iotlb_msg). So, an entry with size = 0, start = 0,\nlast = ULONG_MAX ends up in the iotlb. Next time a packet is sent,\niotlb_access_ok() loops indefinitely due to that erroneous entry.\n\n\tCall Trace:\n\t \u003cTASK\u003e\n\t iotlb_access_ok+0x21b/0x3e0 drivers/vhost/vhost.c:1340\n\t vq_meta_prefetch+0xbc/0x280 drivers/vhost/vhost.c:1366\n\t vhost_transport_do_send_pkt+0xe0/0xfd0 drivers/vhost/vsock.c:104\n\t vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372\n\t kthread+0x2e9/0x3a0 kernel/kthread.c:377\n\t ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295\n\t \u003c/TASK\u003e\n\nReported by syzbot at:\n\thttps://syzkaller.appspot.com/bug?extid=0abd373e2e50d704db87\n\nTo fix this, do two things:\n\n1. Return -EINVAL in vhost_chr_write_iter() when userspace asks to map\n   a range with size 0.\n2. Fix vhost_iotlb_add_range_ctx() to handle the range [0, ULONG_MAX]\n   by splitting it into two entries.","modified":"2026-03-20T12:21:57.334232Z","published":"2024-07-16T12:25:25.833Z","related":["SUSE-SU-2024:2894-1","SUSE-SU-2024:2902-1","SUSE-SU-2024:2929-1","SUSE-SU-2024:2939-1","SUSE-SU-2024:2947-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48862.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dad"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48862.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-48862"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0bbe30668d89ec8a309f28ced6d092c90fb23e8c"},{"fixed":"f8d88e86e90ea1002226d7ac2430152bfea003d1"},{"fixed":"d9a747e6b6561280bf1791bb24c5e9e082193dad"},{"fixed":"e2ae38cf3d91837a493cb2093c87700ff3cbe667"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-48862.json"}}],"schema_version":"1.7.5"}