{"cve":"CVE-2022-48862","nvd":{"published":"2024-07-16T13:15:13.100","modified":"2026-06-17T05:16:24.570","status":"Modified","description":"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 <TASK>\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 </TASK>\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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-835"],"references":["https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dad","https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667","https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1","https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dad","https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:52:42.518321223+00:00"},"epss":{"cve":"CVE-2022-48862","score":0.00209,"percentile":0.11122,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}